--- loncom/interface/lonstatistics.pm	2002/05/30 13:36:18	1.24
+++ loncom/interface/lonstatistics.pm	2002/07/22 20:35:05	1.29
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # (Publication Handler
 #
-# $Id: lonstatistics.pm,v 1.24 2002/05/30 13:36:18 stredwic Exp $
+# $Id: lonstatistics.pm,v 1.29 2002/07/22 20:35:05 stredwic Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -31,7 +31,7 @@
 # 11/1,11/4,11/16,12/14,12/16,12/18,12/20,12/31 Behrouz Minaei
 # YEAR=2002
 # 1/22,2/1,2/6,2/25,3/2,3/6,3/17,3/21,3/22,3/26,4/7,5/6 Behrouz Minaei
-# 5/12,5/14,5/15,5/19,5/26 Behrouz Minaei
+# 5/12,5/14,5/15,5/19,5/26,7/16  Behrouz Minaei
 #
 ###
 
@@ -42,6 +42,9 @@ use Apache::Constants qw(:common :http);
 use Apache::lonnet();
 use Apache::lonhomework;
 use Apache::loncommon;
+use Apache::loncoursedata;
+use Apache::lonhtmlcommon;
+use Apache::lonchart;
 use HTML::TokeParser;
 use GDBM_File;
 
@@ -49,103 +52,264 @@ use GDBM_File;
 my %hash;
 my %CachData;
 my %GraphDat;
-my %OpResp;
-my %maps;
-my %mapsort;
-my %section;
-my %StuBox;
-my %DiscFac;
-my %DisUp;
-my %DisLow;
-my $UpCnt;
-my $CurMap;
-my $CurSec;
-my $CurStu;
-my @cols;
-my @list;
-my @students;
-my $p_count;
-my $Pos;
 my $r;
-my $OpSel1;
-my $OpSel2;
-my $OpSel3;
-my $OpSel4;
 my $GData;
-my $cid;
-my $firstres;
-my $lastres;
-my $DiscFlag;
-my $HWN;
-my $P_Order;
+my %color;
 my %foil_to_concept;
 my @Concepts;
 my %ConceptData;
-my %Header = (0,"Homework Sets Order",1,"#Stdnts",2,"Tries",3,"Mod",
-              4,"Mean",5,"#YES",6,"#yes",7,"%Wrng",8,"DoDiff",
-              9,"S.D.",10,"Skew.",11,"D.F.1st",12,"D.F.2nd");
-my %Answer = ();
+my %Answer=();
+my %mapsort;
+
+my %Activity=();
+my %Grade=();
+my %DoDiff=();
+my %Discuss=();
+my $TotalDiscuss=0;
+my $TotalDiscuss_=0;
+
+
+sub LoadDiscussion {
+#    my $symb=shift;
+#    $r->print('<br>$cid ... '.$symb);
+#    my %contrib=&Apache::lonnet::dump('msu_2964385f9033c63msul1','msu','2964385f9033c63msul1');
+    my $cid=$ENV{'request.course.id'};
+    my %contrib=&Apache::lonnet::dump(
+                $ENV{'request.course.id'},
+                $ENV{'course.'.$ENV{'request.course.id'}.'.domain'},
+                $ENV{'course.'.$ENV{'request.course.id'}.'.num'});
+				                            
+    foreach my $temp(keys %contrib) {
+	if ($temp=~/^version/) {
+	    my $ver=$contrib{$temp};
+	    my ($dummy,$prb)=split(':',$temp);
+	    for (my $idx=1; $idx<=$ver; $idx++ ) {
+		my $name=$contrib{"$idx:$prb:sendername"};
+		$Discuss{"$name:$prb"}=$idx;	
+	    }
+	}
+    }       
+#   $r->print('<br>cid='.$cid);
+#    my %contrib=&Apache::lonnet::restore($symb,$cid,
+#					 $ENV{$cid.'.domain'},
+#					 $ENV{'course.'.$cid.'.num'});
+
+#    $Apache::lonxml::debug=1;
+#    &Apache::lonhomework::showhash(%Discuss);
+#    $Apache::lonxml::debug=0;
+}
+
+sub LoadDoDiffFile {
+    my $file="/home/minaeibi/183d.txt";
+    open(FILEID, "<$file");
+    my $line=<FILEID>;
+    %DoDiff=();
+    my @Act=split('&',$line);
+    
+#    $r->print('<br>'.$#Act);
+    for(my $n=0;$n<=$#Act;$n++){
+       my ($res,$Degree)=split('@',$Act[$n]);
+      $DoDiff{$res}=$Degree;
+    }
+}
 
 
-sub unescape {
-    my $str=shift;
-    $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
-    return $str;
+sub LoadClassFile {
+    my $file="/home/minaeibi/class.txt";
+    open(FILEID, "<$file");
+    my $line;
+    %Grade=();
+    while ($line=<FILEID>) {
+        my ($id,$ex1,$ex2,$ex3,$ex4,$hw,$final,$grade)=split(' ',$line);
+        $Grade{$id}=$grade;
+    }
+}
+
+
+#------- Classification  
+sub Classify {
+    my ($DiscFac, $students)=@_;
+    &LoadClassFile();
+    my $Count=0;
+    my @List=();
+    my @LS=();
+    my @LF=();
+    my @LM=();
+    my $cf=0;
+    my $cs=0;
+    my $cm=0;
+    foreach (keys(%$DiscFac)){  
+	my @l=split(/\:/,$_);
+	if (!($students->{$l[1]})) {next;}
+	my $Grade=$Grade{$students->{$l[1]}};
+	if( $Grade > 3 ) {
+	    $cs++;
+	    push(@LS,("$l[6],$l[5],$l[4],$l[7],$l[8],$l[9],Successful"));
+	} elsif ( $Grade > 2 ) {
+	    $cm++;
+	    push(@LM,("$l[6],$l[5],$l[4],$l[7],$l[8],$l[9],Average"));
+	} else {
+	    $cf++;
+	    push(@LF,("$l[6],$l[5],$l[4],$l[7],$l[8],$l[9],Failed"));
+	}
+    }    
+    for(my $n=0;$n<$cs;$n++){$r->print('<br>'.$LS[$n]);}
+    for(my $n=0;$n<$cm;$n++){$r->print('<br>'.$LM[$n]);}  
+    for(my $n=0;$n<$cf;$n++){$r->print('<br>'.$LF[$n]);}
+} 
+
+
+sub ProcAct {
+    # return;
+    my ($Act,$Submit)=@_;
+    my @Act=split(/\@/,$Act);
+    @Act = sort(@Act);
+
+    ##$r->print('<br>'.$#Act);
+    ##for(my $n=0;$n<=$#Act;$n++){
+##	$r->print('<br>n='.$n.')'.$Act[$n]);
+##    }
+
+#    my $Beg=$Act[0];
+    my $Dif=$Submit-$Act[0];
+    $Dif = ($Dif>0) ? ($Dif/3600) : 0; 
+
+#    $r->print('<br>Access Number = '.$#Act.'<br>Submit Time='.$Submit.'<br>First Access='.$Act[0].'<br>Last Access='.$Act[$#Act].'<br> Submit - First = <b>'.$Dif.'</b>');
+
+
+#time spent for solving the problem           
+#    $r->print('<br>Def'.($Act[$#Act-1]-$Act[0]));
+
+    return $Dif;
+}
+
+
+
+sub LoadActivityLog {
+#    my $CacheDB = "/home/minaeibi/act183.log.cache";
+    my $CacheDB = "/home/httpd/perl/tmp/act183.log.cache";
+    
+    if (-e "$CacheDB") {
+	if (tie(%Activity,'GDBM_File',"$CacheDB",&GDBM_READER,0640)) {
+	    return;
+        }
+        else {
+	    $r->print("Unable to tie log Cache hash to db file");
+        }
+    }
+    else {
+	if (tie(%Activity,'GDBM_File',$CacheDB,&GDBM_WRCREAT,0640)) {
+	    foreach (keys %Activity) {delete $Activity{$_};}
+	    &Build_log(); 
+	}
+        else {
+	    $r->print("Unable to tie log Build hash to db file");
+        }
+    }
+}
+
+sub Build_log {
+    my $file="/home/minaeibi/act183.log";
+    open(FILEID, "<$file");
+    my $line;
+    my $count=0;
+    while ($line=<FILEID>) {
+	my ($time,$machine,$what)=split(':',$line);
+	$what=&Apache::lonnet::unescape($what);
+	my @accesses=split('&',$what);
+	           
+	foreach my $access (@accesses) {
+
+	    $count++;
+
+	    my ($date,$resource,$who,$domain,$post,@posts)=split(':',$access);
+	    if (!$resource) { next; }
+	    my $res=&Apache::lonnet::unescape($resource);
+	    if (($res =~ /\.problem/)) {
+		$Activity{$who.':'.$res}.=$date.'@';
+                #$r->print('<br>'.$time.':'.$who.'---'.$res);
+		&Update_PrgInit($count);
+
+	    }
+	}
+    }
+
+# my $c=1;
+# foreach (sort keys %Activity) {
+#     $r->print('<br>'.$c.')'.$_.' ... '.$Activity{$_});
+#     $c++;
+# }
+
 }
 
 sub Activity {
-    my $file="/home/minaeibi/minaei";
-    my $userid='billskat';
+#    $rid=~/(\d+)\.(\d+)/;
+#    my $MapId=$1;
+#    my $PrbId=$2;
+#    my $MapOrg = $hash{'map_id_'.$MapId};
+#    my $Map = &Apache::lonnet::declutter($MapOrg);
+#    my $URI = $hash{'src_'.$rid};
+#    my $Symb = $Map.'___'.$PrbId.'___'.&Apache::lonnet::declutter($URI);
+    my $file="/home/minaeibi/activity.log";
+    my $userid='adamsde1';
     $r->print("<br>Using $file");
     $r->rflush();
     open(FILEID, "<$file");
     my $line;
     my @allaccess;
+    my $Count=0;
     while ($line=<FILEID>) {
 	my ($time,$machine,$what)=split(':',$line);
-	#$r->print("time=$time machine=$machine:-> $what\n");
-	#$r->rflush();
-	$what=&unescape($what);
+	$what=&Apache::lonnet::unescape($what);
 	my @accesses=split('&',$what);
 	foreach my $access (@accesses) {
 	    my ($date,$resource,$who,$domain,$post,@posts)=split(':',$access);
-	    if ($who ne $userid) { next; }
-	    #if (!$resource) { next; }
-	    push (@allaccess,unescape($access));
+	    #if ($who ne $userid) { next; }
+	    if (!$resource) { next; }
+	    my $res=&Apache::lonnet::unescape($resource);
+	    if (($res =~ /\.(sequence|problem|htm|html|page)/)) {
+	    	$Count++;
+		$r->print("<br>$Count) ".localtime($date).": $who --> $res");
+#	        if ($post) { 
+#		    $Count++;
+#		    $r->print("<br><b>$Count) Sent data ".join(':',
+#                              &Apache::lonnet::unescape(@posts)).'</b>');
+#		}
+		$r->rflush();
+	    }
+	    #push (@allaccess,unescape($access));
 	    #print $machine;
 	}
     }
-    @allaccess=sort(@allaccess);
-    my $Count=0;
-    foreach my $access (@allaccess) {
-	my ($date,$resource,$who,$domain,$post,@posts)=split(':',$access);
-	$Count++;
-#	$r->print("$Count ".localtime($date)." $who $resource\n");
-	$r->print("<br>$Count) $date: $who --> $resource");
-	$r->rflush();
-	if ($post) { 
-	    $r->print("<br><b>Sent data ".join(':',unescape(@posts)).'</b>');
-	}
-    }
+#    @allaccess=sort(@allaccess);
+#    $Count=0;
+#    foreach my $access (@allaccess) {
+#	my ($date,$resource,$who,$domain,$post,@posts)=split(':',$access);
+#	$Count++;
+#	$r->print("<br>$Count) $date: $who --> $resource");
+#	$r->rflush();
+#	if ($post) { 
+#	    $r->print("<br><b>Sent data ".join(':',unescape(@posts)).'</b>');
+#	}
+#    }
 }
 
 
-
 sub InitAnalysis {
-    my ($rid, $student)=@_;
+    my ($uri,$part,$problem,$student,$courseID)=@_;
     my ($uname,$udom)=split(/\:/,$student);
-    $rid=~/(\d+)\.(\d+)/;
-    my $symb=&Apache::lonnet::declutter($hash{'map_id_'.$1}).'___'.$2.'___'.
-	     &Apache::lonnet::declutter($hash{'src_'.$rid});
-    my $URI = $hash{'src_'.$rid};
-    my $Answ=&Apache::lonnet::ssi($URI,('grade_target' => 'analyze',
+
+
+    # Render the student's view of the problem.  $Answ is the problem 
+    # Stringafied
+    my $Answ=&Apache::lonnet::ssi($uri,('grade_target' => 'analyze',
                                   'grade_username' => $uname,
                                   'grade_domain' => $udom,
-                                  'grade_courseid' => $cid,
-                                  'grade_symb' => $symb));
+                                  'grade_courseid' => $courseID,
+                                  'grade_symb' => $problem));
 #    my $Answ=&Apache::lonnet::ssi($URI,('grade_target' => 'analyze'));
 
-    (my $garbage,$Answ)=split(/_HASH_REF__/,$Answ,2);
+#    (my $garbage,$Answ)=split(/_HASH_REF__/,$Answ,2);
     %Answer=();
     %Answer=&Apache::lonnet::str2hash($Answ);
 
@@ -167,12 +331,13 @@ sub InitAnalysis {
 	    #$ConceptData{$foil} = $Answer{"$parts.foil.value.$foil"};
 	}
     }
-    return $symb;
+
+    return;
 }
 
 
 sub Interval {
-    my ($rid,$part,$symb)=@_;
+    my ($part,$symb)=@_;
     my $Int=$ConceptData{"Interval"};
     my $due = &Apache::lonnet::EXT('resource.$part.duedate',$symb)+1;
     my $opn = &Apache::lonnet::EXT('resource.$part.opendate',$symb);
@@ -193,39 +358,44 @@ sub Interval {
 
 
 sub ShowOpGraph {
-    my ($InpStr, $Int_No)=@_;
-    my ($rid,$part)=split(/\:/,substr($InpStr,8));
-    $ConceptData{"Interval"}=$Int_No;
+    my ($cache, $students, $courseID)=@_;
+    my $uri      = $cache->{'AnalyzeURI'};
+    my $part     = $cache->{'AnalyzePart'};
+    my $problem  = $cache->{'AnalyzeProblem'};
+    my $title    = $cache->{'AnalyzeTitle'};
+    my $interval = $cache->{'Interval'};
+    $ConceptData{"Interval"} = $interval;
+
     #Initialize the option response true answers
-    my $symb=&InitAnalysis($rid,$students[0]);
+    &InitAnalysis($uri, $part, $problem, $students->[0],$courseID);
+
     #compute the intervals
-    &Interval($rid,$part,$symb);
-    my $URI = $hash{'src_'.$rid};
-    my $Src = $hash{'title_'.$rid};
-    $Src =~ s/\ /"_"/eg;
-    $r->print('<br><b>'.$URI.'</b>');
+    &Interval($part,$problem);
+
+    $title =~ s/\ /"_"/eg;
+    $r->print('<br><b>'.$uri.'</b>');
     $r->rflush();
-    
+         
     #Java script Progress window
     &Create_PrgWin();
-    &Update_PrgWin("Starting to analyze problem");
-    for (my $index=0;$index<=$#students;$index++) {
+    &Update_PrgWin("Starting-to-analyze-problem");
+    for (my $index=0;$index<(scalar @$students);$index++) {
 	&Update_PrgWin($index);
-	&OpStatus($rid,$students[$index]);
+	&OpStatus($problem,$students->[$index],$courseID);
     }
     &Close_PrgWin();
 
     $r->print('<br>');
-    for (my $k=0; $k<$Int_No; $k++ ) {
-	&DrawGraph($k,$Src);
+    for (my $k=0; $k<$interval; $k++ ) {
+	&DrawGraph($k,$title);
     }
-    for (my $k=0; $k<$Int_No; $k++ ) {
+    for (my $k=0; $k<$interval; $k++ ) {
 	&DrawTable($k);
     }
 #$Apache::lonxml::debug=1;
 #&Apache::lonhomework::showhash(%ConceptData);
 #$Apache::lonxml::debug=0;
-    my $Answ=&Apache::lonnet::ssi($URI);
+    my $Answ=&Apache::lonnet::ssi($uri);
     $r->print("<br><b>Here you can see the Problem:</b><br>$Answ");
 }
 
@@ -265,9 +435,9 @@ sub DrawTable {
     for (my $n=0; $n<=$#Concepts; $n++ ) {
 	$Str .= "\n"."<tr>".
 	        "\n"."<td>".($n+1)."</td>".
-                "\n"."<td bgcolor=#FFFFDD> ".$Concepts[$n]." </td>".
-                "\n"."<td bgcolor=#DDFFDD> ".$data1[$n]." </td>".
-                "\n"."<td bgcolor=#FFDDDD> ".$data2[$n]." </td>".
+                "\n".'<td bgcolor='.$color{"yellow"}.'> '.$Concepts[$n]." </td>".
+                "\n".'<td bgcolor='.$color{"green"}.'> '.$data1[$n]." </td>".
+                "\n".'<td bgcolor='.$color{"red"}.'> '.$data2[$n]." </td>".
                 "\n"."</tr>";
     }
     $Str.='<td></td><td><b>From:['.localtime($ConceptData{'Int.'.$k}).
@@ -309,7 +479,6 @@ sub DrawGraph {
 	$Max = int($Max);
     } else { $Max = 1; }
 
-    
     my $Titr=($ConceptData{'Interval'}>1) ? $Src.'_interval_'.($k+1) : $Src;
 #    $GData=$Titr.'&Concepts'.'&'.'Answers'.'&'.$Max.'&'.$P_No.'&'.$data1.'&'.$data2;
     $GData="$Titr&Concepts&Answers&$Max&$P_No&".
@@ -319,51 +488,6 @@ sub DrawGraph {
 }
 
 
-sub AnalyzeProblem {
-    # selecting the number of intervals
-    my $OpSel='';
-    my $CurInt = $ENV{'form.interval'};
-    if ($CurInt eq '') {$CurMap = '1';}
-    my $Ptr = '<br><b>Select number of intervals</b>'."\n".
-       	      '<select name="interval">'."\n";                     	     	     
-    for (my $n=1;$n<=7;$n++) {	          
-	$Ptr .= '<option';
-        if ($CurInt eq $n) {$Ptr .= ' selected';}     
-	$Ptr .= '>'.$n."</option>"."\n";	     
-    }
-    $Ptr .= '</select>'."\n";
-    $r->print( $Ptr );
-
-    #the table of option response problems
-    $r->print('<br><b> Option Response Problems in this course:</b><br><br>');
-    my $Str = "\n".'<table border=2>'.
-              "\n".'<tr>'.
-              "\n".'<th> # </th>'.
-	      "\n".'<th> Problem Title </th>'.
-	      "\n".'<th> Resource </th>'.
-	      "\n".'<th> Address </th>'.
-	      "\n".'</tr>';
-
-     my $P_No=1;
-     foreach (sort keys %OpResp) {
-	 my ($rid,$part)=split(/\:/,$OpResp{$_});
-	 my $Temp = '<a href="'.$hash{'src_'.$rid}.
-                    '" target="_blank">'.$hash{'title_'.$rid}.'</a>';
-	 $Str .= "\n"."<tr>".
-	         "\n"."<td> $P_No </td>".
-                 "\n"."<td bgcolor=#DDFFDD> ".$Temp." </td>".
-                 "\n"."<td bgcolor=#EEFFCC> ".$hash{'src_'.$rid}." </td>".
-	         "\n"."<td> ".'<input type="submit" name="sort" value="'.'Analyze_'.$rid.'" />'.'</td>'.
-                 "\n"."</tr>";
-	 $P_No++;
-     }
-     $Str .= "\n".'</table>';
-     $Str .= "\n".'</form>';
-     $r->print($Str);
-     $r->rflush();	
-}
-
-
 sub Decide {
     #deciding the true or false answer belongs to each interval
     my ($type,$foil,$time)=@_; 
@@ -373,16 +497,13 @@ sub Decide {
     $ConceptData{"$foil_to_concept{$foil}.$k.$type"}++;
 }
 
-
 #restore the student submissions and finding the result
 sub OpStatus {
-    my ($rid,$student)=@_;
-    my ($uname,$udom)=split(/\:/,$student);
+    my ($problem, $student, $courseID)=@_;
+    my ($username,$userdomain)=split(/':'/,$student);
     my $code='U';
-    $rid=~/(\d+)\.(\d+)/;
-    my $symb=&Apache::lonnet::declutter($hash{'map_id_'.$1}).'___'.$2.'___'.
-	     &Apache::lonnet::declutter($hash{'src_'.$rid});
-    my %reshash=&Apache::lonnet::restore($symb,$cid,$udom,$uname);
+    my %reshash=&Apache::lonnet::restore($problem, $courseID, $userdomain, 
+                                         $username);
     my @True = ();
     my @False = ();
     my $flag=0;
@@ -420,72 +541,79 @@ sub OpStatus {
 }
 
 
+#---- END Analyze Web Page ----------------------------------------------
+
+#---- Problem Statistics Web Page ---------------------------------------
+
 #------- Processing upperlist and lowerlist according to each problem
-sub ProcessDisc {
-    my @List = @_;
-    @List = sort (@List);
-    my $Count = $#List+1;
-    my $Prb;
+sub ProcessDiscriminant {
+    my ($List) = @_;
+    my @sortedList = sort (@$List);
+    my $Count = scalar @sortedList;
+    my $Problem;
     my @Dis;
     my $Slvd=0;
     my $tmp;
     my $Sum1=0;
     my $Sum2=0;
-    my $nIdx=0;
-    my $nStud=0;
-    my %Proc;
-    undef %Proc;
-    while ($nIdx<$Count) {
-	($Prb,$tmp)=split(/\=/,$List[$nIdx]);
+    my $nIndex=0;
+    my $nStudent=0;
+    my %Proc=undef;
+    while ($nIndex<$Count) {
+	($Problem,$tmp)=split(/\=/,$sortedList[$nIndex]);
 	@Dis=split(/\+/,$tmp);
-	my $Temp = $Prb;
+	my $Temp = $Problem;
 	do {
-	    $nIdx++;
-	    $nStud++;
+	    $nIndex++;
+	    $nStudent++;
 	    $Sum1 += $Dis[0];
 	    $Sum2 += $Dis[1];
-	    ($Prb,$tmp)=split(/\=/,$List[$nIdx]);
+	    ($Problem,$tmp)=split(/\=/,$sortedList[$nIndex]);
 	    @Dis=split(/\+/,$tmp);
-	} while ( $Prb eq $Temp && $nIdx < $Count );
-#	$Proc{$Temp}=($Sum1/$nStud).':'.$nStud;
-	$Proc{$Temp}=($Sum1/$nStud).':'.($Sum2/$nStud);
-#       $r->print("$nIdx) $Temp --> ($nStud) $Proc{$Temp} <br>");
+	} while ( $Problem eq $Temp && $nIndex < $Count );
+#	$Proc{$Temp}=($Sum1/$nStudent).':'.$nStudent;
+	$Proc{$Temp}=($Sum1/$nStudent).':'.($Sum2/$nStudent);
+#       $r->print("$nIndex) $Temp --> ($nStudent) $Proc{$Temp} <br>");
 	$Sum1=0;
 	$Sum2=0;
-	$nStud=0;
+	$nStudent=0;
     }
+
     return %Proc;
 }
 
 
+
 #------- Creating Discimination factor   
 sub Discriminant {
-    my $Count=0;
-    foreach (keys(%DiscFac)){ 
-	$Count++;
-    }
-    $UpCnt = int(0.27*$Count);
+    my ($discriminantFactor)=@_;
+    my @discriminantKeys=keys(%$discriminantFactor);
+    my $Count = scalar @discriminantKeys;
+
+    my $UpCnt = int(0.27*$Count);
     my $low=0;
     my $up=$Count-$UpCnt;
     my @UpList=();
     my @LowList=();
+
     $Count=0;
-    foreach my $key (sort(keys(%DiscFac))){ 
+    foreach my $key (sort(@discriminantKeys)) { 
 	$Count++;    
-        #$r->print("<br>$Count) $key = $DiscFac{$key}");
-	if ($low < $UpCnt || $Count > $up) {
-	    $low++;
-	    my $str=$DiscFac{$key};
-	    foreach(split(/\:/,$str)){
-		if ($_) {
-		    if ($low<$UpCnt){push(@LowList,$_);}
-		    else {push(@UpList,$_);}
-		}
-	    }
-	}
+	if($low < $UpCnt || $Count > $up) {
+            $low++;
+            my $str=$discriminantFactor->{$key};
+            foreach(split(/\:/,$str)){
+                if($_) {
+                    if($low<$UpCnt) { push(@LowList,$_); }
+                    else            { push(@UpList,$_);  }
+                }
+            }
+        }
     }
-    %DisUp=&ProcessDisc(@UpList);
-    %DisLow=&ProcessDisc(@LowList);
+    my %DisUp =  &ProcessDiscriminant(\@UpList);
+    my %DisLow = &ProcessDiscriminant(\@LowList);
+
+    return (\%DisUp, \%DisLow);
 }
 
    
@@ -493,532 +621,223 @@ sub NumericSort {
     $a <=> $b;
 }
 
-# ------ Create different Student Report 
-sub StudentReport {
-    my ($sname,$sdom)=@_;
-    if ( $sname eq 'All Students' ) {
-	$r->print( '<h3><font color=blue>WARNING: 
-                    Please select a student</font></h3>' );
+
+sub CreateProblemStatisticsTableHeading {
+    my ($displayFormat,$sequenceSource,$sequenceTitle,$headings)=@_;
+    if($displayFormat eq 'Display CSV Format') {
+        $r->print('<br>"'.$sequenceTitle.'","');
+        $r->print($sequenceSource.'"');
 	return;
     }
-    my %result = &Apache::lonnet::dump($cid,$sdom,$sname);
-    my $ResId;
-    my $PrOrd;
-    my $Code;
-    my $Tries;
-    my $TotalTries = 0;
-    my $ParCr = 0;
-    my $Wrongs;
-    my %TempHash;
-    my $Version;
-    my $LatestVersion;
-    my $PtrTry='';
-    my $PtrCod='';
-    my $SetNo=0;
-    my $Str = "\n".'<table border=2>'.
-              "\n".'<tr>'.
-              "\n".'<th> # </th>'.
-	      "\n".'<th> Set Title </th>'.
-	      "\n".'<th> Results </th>'.
-	      "\n".'<th> Tries </th>'.
-	      "\n".'</tr>';
-    my ($temp)=keys(%result);
-    unless ($temp=~/^(con_lost|error|no_such_host)/i) {
-        foreach my $CurCol (@cols) {
-	    if (!$CurCol){
-		my $Set=&Apache::lonnet::declutter($hash{'map_id_'.$1});
-		if ( $Set ) {
-		    $SetNo++;
-		    $Str .= "\n"."<tr>".
-			    "\n"."<td> $SetNo </td>".
-                            "\n"."<td> $Set </td>".
-                            "\n"."<td> $PtrCod </td>".
-                            "\n"."<td> $PtrTry</td>".
-                            "\n"."</tr>";
-		}
-		$PtrTry='';
-		$PtrCod='';
-		next; 
-	    }
-	    ($PrOrd,$ResId)=split(/\:/,$CurCol);
-            $ResId=~/(\d+)\.(\d+)/;
-            my $Map = &Apache::lonnet::declutter( $hash{'map_id_'.$1} );
-            if ( $CurMap ne 'All Maps' ) {
-		my ( $ResMap, $NameMap ) = split(/\=/,$CurMap);
-		if ( $Map ne $ResMap ) { next; }
-	    }
-	    my $meta=$hash{'src_'.$ResId};
-	    my $PartNo = 0;
-	    undef %TempHash;
-	    foreach (split(/\,/,&Apache::lonnet::metadata($meta,'keys'))){
-		if ($_=~/^stores\_(\w+)\_tries$/) {
-                    my $Part=&Apache::lonnet::metadata($meta,$_.'.part');
-		    if ( $TempHash{"$Part"} eq '' ) { 
-			$TempHash{"$Part"} = $Part;
-			$TempHash{$PartNo}=$Part;
-			$TempHash{"$Part.Code"} = '-';  
-			$TempHash{"$Part.PrOrd"} = $PrOrd+$PartNo;  
-			$PartNo++;
-		    }
-		}
-            }
 
-            my $Prob = $Map.'___'.$2.'___'.
-                       &Apache::lonnet::declutter( $hash{'src_'.$ResId} );
-            $Code='U';
-            $Tries = 0;
-            $Wrongs = 0;
-  	    $LatestVersion = $result{"version:$Prob"};
-	    if ( $LatestVersion ) {
-		for ( my $Version=1; $Version<=$LatestVersion; $Version++ ) {
-		    my $vkeys = $result{"$Version:keys:$Prob"};
-		    my @keys = split(/\:/,$vkeys);		
-  
-		    foreach my $Key (@keys) {		  
-			if (($Key=~/\.(\w+)\.solved$/) && ($Key!~/^\d+\:/)) {
-			    my $Part = $1;
-			    $Tries = $result{"$Version:$Prob:resource.$Part.tries"};
-			    $TempHash{"$Part.Tries"} = ($Tries) ? $Tries : 0; 
-			    $TotalTries += $Tries;
-			    my $Val = $result{"$Version:$Prob:resource.$Part.solved"};
-			    if ( $Val eq 'correct_by_student' )
-                                { $Wrongs = $Tries - 1; $Code = 'Y'; } 
-			    elsif ( $Val eq 'correct_by_override' )
-                                { $Wrongs = $Tries - 1; $Code = 'y'; }                        
-			    elsif ( $Val eq 'incorrect_attempted' || 
-                                $Val eq 'incorrect_by_override' )
-		                { $Wrongs = $Tries; $Code = 'N'; }
-			    $TempHash{"$Part.Code"} = $Code;
-			    $TempHash{"$Part.Wrongs"} = $Wrongs;
-			}
-     		    }
-                }
-		for ( my $n = 0; $n < $PartNo; $n++ ) {		  
-		    my $part = $TempHash{$n};
-		    if ($PtrTry ne '') {$PtrTry .= ',';}
-		    $PtrTry .= "$TempHash{$part.'.Tries'}";
-                    $PtrCod .= "$TempHash{$part.'.Code'}";    
-		}
-            }
-	    else { 
-		for(my $n=0; $n<$PartNo; $n++) { 
-		    if ($PtrTry ne '') {$PtrTry .= ',';}
-		    $PtrTry .= "0";
-                    $PtrCod .= "-"; 
-		}
-	    }
-        }
-    }
-    $Str .= "\n".'</table>';
-    $r->print($Str);
-    $r->rflush();
-}
+    $r->print('<br><a href="'.$sequenceSource.
+              '" target="_blank">'.$sequenceTitle.'</a>');
 
-sub CreateTable {
-    my ($Hd, $Hid)=@_;
-    if ($ENV{'form.showcsv'}) { 
-	if ( $Hd == 1 ) {
-	    $r->print('<br>"'.$hash{'title_'.$Hid}.'","'.$hash{'src_'.$Hid}.'"');
-	}
-	return;
-    }
-    my $ColNo=0;
-    foreach (keys(%Header)){ 
-	$ColNo++;
-    } 
-    if ( $Hd == 1 ) {
-	$r->print('<br><a href="'.$hash{'src_'.$Hid}.
-                  '" target="_blank">'.$hash{'title_'.$Hid}.'</a>');
-    }
-    my $Result = "\n".'<table border=2>';
-    $Result .= '<tr><th>P#</th>'."\n";
-    for ( my $nIdx=0; $nIdx < $ColNo; $nIdx++ ) { 
-	$Result .= '<th>'.'<input type="submit" name="sort" value="'.
-                   $Header{$nIdx}.'" />'.'</th>'."\n";
+    my $Result = "\n".'<table border=2><tr><th>P#</th>'."\n";
+    for(my $nIndex=0; $nIndex < (scalar (keys %$headings)); $nIndex++) { 
+	$Result .= '<th>'.'<input type="submit" name="';
+        $Result .= 'ProblemStatisticsHeading" value="';
+        $Result .= $headings->{$nIndex}.'" />'.'</th>'."\n";
     }
     $Result .= "\n".'</tr>'."\n";    
-    $r->print( $Result );
+    $r->print($Result);
     $r->rflush();
 }
 
 sub CloseTable {
-    if ($ENV{'form.showcsv'}) {
+    my ($cache)=@_;
+    if($cache->{'DisplayFormat'} eq 'Display CSV Format') {
 	return;
     }    
     $r->print("\n".'</table>'."\n");
     $r->rflush();
 }
+
+
  
-# ------------------------------------------- Prepare Statistics Table
-sub PreStatTable {
+# ------ Dump the Student's DB file and handling the data for statistics table 
+sub ExtractStudentData {
+    my ($cache,$name,$list)=@_;
+    my %discriminantFactor;
 
-    my $CacheDB = "/home/httpd/perl/tmp/$ENV{'user.name'}".
-                  "_$ENV{'user.domain'}_$cid\_statistics.db";
-    my $GraphDB = "/home/httpd/perl/tmp/$ENV{'user.name'}".
-                  "_$ENV{'user.domain'}_$cid\_graph.db";
-    my $OpSel11='';
-    my $OpSel12='';
-    my $OpSel13='';
-    my $Status = $ENV{'form.status'};
-    if ( $Status eq 'Any' ) { $OpSel13='selected'; }
-    elsif ($Status eq 'Expired' ) { $OpSel12 = 'selected'; }
-    else { $OpSel11 = 'selected'; }
+    my $totalTries = 0;
+    my $totalAwarded = 0;
+    my $tempProblemOrder=0;
+    my $spent=0;
+    my $spent_yes=0;
+    my $TotDiscuss=0;
+    my $TotalOpend = 0;
+    my $ProbSolved = 0;
+    my $ProbTot = 0;
+    my $TotFirst = 0;
+    my $TimeTot = 0;
+    my $Discussed=0;
 
-    my $Ptr = '';
-    $Ptr .= '<br><b> Student Status: &nbsp; </b>'."\n".
-            '<select name="status">'. 
-            '<option '.$OpSel11.' >Active</option>'."\n".
-            '<option '.$OpSel12.' >Expired</option>'."\n".
-	    '<option '.$OpSel13.' >Any</option> </select> '."\n";
-    $Ptr .= '&nbsp;&nbsp;&nbsp;';
-    $Ptr .= '<input type=submit name=sort value="Recalculate Statistics"/>'."\n";
+    foreach my $sequence (split(':', $cache->{'orderedSequences'})) {
+        if($cache->{'ProblemStatisticsMap'} ne 'All Maps'  &&
+           $cache->{'ProblemStatisticsMap'} ne $cache->{$sequence.':title'}) {
+            next;
+        }
 
-    $Ptr .= '<br><b> Sorting Type: &nbsp; </b>'."\n".
-            '<select name="order"> <option '.$OpSel1.' >Ascending</option>'."\n".
-	    '<option '.$OpSel2.'>Descending</option> </select> '."\n";
-    $Ptr .= '&nbsp;&nbsp;&nbsp;';
-    $Ptr .= '<input type="submit" name="sort" value="DoDiff Graph" />'."\n";
-    $Ptr .= '&nbsp;&nbsp;&nbsp;';
-    $Ptr .= '<input type="submit" name="sort" value="%Wrong Graph" />'."\n";
+        my $Dis = '';
+        foreach my $problemID (split(':', $cache->{$sequence.':problems'})) {
+            my $problem = $cache->{$problemID.':problem'};
+            my $LatestVersion = $cache->{$name.':version:'.$problem};
+
+            # Output dashes for all the parts of this problem if there
+            # is no version information about the current problem.
+            #if(!$LatestVersion) {
+            #    foreach my $part (split(/\:/,$cache->{$sequence.':'.
+            #                                          $problemID.
+            #                                          ':parts'})) {
+            #        $codes    .= "-,";
+            #        $attempts .= "0,"; 
+            #    }
+            #    next;
+            #}
+
+            my %partData=undef;
+            # Initialize part data, display skips correctly
+            # Skip refers to when a student made no submissions on that
+            # part/problem.
+            foreach my $part (split(/\:/,$cache->{$sequence.':'.
+                                                  $problemID.
+                                                  ':parts'})) {
+                $partData{$part.':tries'}=0;
+                $partData{$part.':code'}='-';
+            }
 
-    $Ptr .= '<pre>'.
-    '<b>  #Stdnts</b>: Total Number of Students opened the problem.<br>'. 
-    '<b>  Tries  </b>: Total Number of Tries for solving the problem.<br>'. 
-    '<b>  Mod    </b>: Maximunm Number of Tries for solving the problem.<br>'. 
-    '<b>  Mean   </b>: Average Number of the tries. [ Tries / #Stdnts ]<br>'.
-    '<b>  #YES   </b>: Number of students solved the problem correctly.<br>'. 
-    '<b>  #yes   </b>: Number of students solved the problem by override.<br>'.
-    '<b>  %Wrng  </b>: Percentage of students tried to solve the problem but'.
-    ' still incorrect. [ 100*((#Stdnts-(#YES+#yes))/#Stdnts) ]<br>'.
-#    '  DoDiff : Degree of Difficulty of the problem. [ Tries/(#YES+#yes+0.1) ]<br>'. Kashy formula
-    '<b>  DoDiff </b>: Degree of Difficulty of the problem. [ 1 - ((#YES+#yes) / Tries) ]<br>'. #Gerd formula
-    '<b>  S.D.  </b> : Standard Deviation of the tries.'.
-    '[ sqrt(sum((Xi - Mean)^2)) / (#Stdnts-1)'.
-    ' where Xi denotes every student\'s tries ]<br>'.
-    '<b>  Skew.  </b>: Skewness of the students tries.'.
-	' [ (sqrt( sum((Xi - Mean)^3) / #Stdnts)) / (S.D.^3) ]<br>'.
-    '<b>  Dis.F. </b>: Discrimination Factor: A Standard for '.
-	'evaluating the problem according to a Criterion<br>'.
-	'<b>           [Applied Criterion in %27 Upper Students - '.
-	'Applied the same Criterion in %27 Lower Students]</b><br>'.
-    '<b>           1st Criterion</b> for Sorting the Students: '.
-	'<b>Sum of Partial Credit Awarded / Total Number of Tries</b><br>'.
-    '<b>           2nd Criterion</b> for Sorting the Students: '.
-	'<b>Total number of Correct Answers / Total Number of Tries</b>'.	
-            '</pre>';
+            # Looping through all the versions of each part, starting with the
+            # oldest version.  Basically, it gets the most recent 
+            # set of grade data for each part.
+	    for(my $Version=1; $Version<=$LatestVersion; $Version++) {
+                foreach my $part (split(/\:/,$cache->{$sequence.':'.
+                                                      $problemID.
+                                                      ':parts'})) {
+
+                    if(!defined($cache->{$name.":$Version:$problem".
+                                               ":resource.$part.solved"})) {
+                        # No grade for this submission, so skip
+                        next;
+                    }
+
+                    my $tries=0;
+                    my $time=0;
+                    my $awarded=0;
+		    $Discussed=0;
+                    my $code='U';
+
+                    $awarded = $cache->{$name.
+                                        "$Version:$problem:resource.".
+                                        "$part.awarded"};
+                    $partData{$part.':awarded'} = ($awarded) ? $awarded : 0;
+                    $totalAwarded += $awarded;
+
+                    $tries = $cache->{$name.":$Version:$problem".
+                                      ":resource.$part.tries"};
+                    $partData{$part.':tries'} = ($tries) ? $tries : 0;
+                    $partData{$part.':wrong'} = $partData{$part.':tries'};
+                    $totalTries += $tries;
+
+                    my $val = $cache->{$name.":$Version:$problem".
+                                       ":resource.$part.solved"};
+                    if    ($val eq 'correct_by_student')   {$code = 'C';} 
+                    elsif ($val eq 'correct_by_override')  {$code = 'O';}
+                    elsif ($val eq 'incorrect_attempted')  {$code = 'I';} 
+                    elsif ($val eq 'incorrect_by_override'){$code = 'I';}
+                    elsif ($val eq 'excused')              {$code = 'x';}
+                    $partData{$part.':code'}=$code;
+
+                    if($partData{$part.':wrong'} ne 0 && 
+                       ($code eq 'C' || $code eq 'O')) {
+                        $partData{$part.':wrong'}--;
+                    }
+                }
+            }
 
-    $r->print($Ptr);
-    
-    $r->print('Output CSV format: <input type=checkbox name=showcsv onClick="submit()"');
-    if ($ENV{'form.showcsv'}) { $r->print(' checked'); }
-    $r->print('>');
-
-    $r->rflush();	
-
-    if ((-e "$CacheDB")&&($ENV{'form.sort'} ne 'Recalculate Statistics')) {
-	if (tie(%CachData,'GDBM_File',"$CacheDB",&GDBM_READER,0640)) {
-	    tie(%GraphDat,'GDBM_File',$GraphDB,&GDBM_WRCREAT,0640);
-	    &Cache_Statistics();
-        }
-        else {
-	    $r->print("Unable to tie hash to db file");
-        }
-    }
-    else {
-	if (tie(%CachData,'GDBM_File',$CacheDB,&GDBM_WRCREAT,0640)) {
-	    tie(%GraphDat,'GDBM_File',$GraphDB,&GDBM_WRCREAT,0640);
-	    foreach (keys %DiscFac) {delete $CachData{$_};}
-	    foreach (keys %CachData) {delete $CachData{$_};}
-	    $DiscFlag=0;
-	    &Build_Statistics();
-	}
-        else {
-	    $r->print("Unable to tie hash to db file");
-        }
-    }
+            # Loop through all the parts for the current problem in the 
+            # correct order and prepare the output
+            foreach (split(/\:/,$cache->{$sequence.':'.$problemID.
+                                         ':parts'})) {
+                my $Yes = 0;
+                if($partData{$_.':code'} eq 'C' || 
+                   $partData{$_.':code'} eq 'O') {
+                    $Yes=1;
+                }
+                #my $ptr = "$hash{'title_'.$ResId}";
+                my $ptr = $tempProblemOrder.'&'.$problemID;
 
-#    $r->print('Total instances of the problems : '.($p_count*($#students+1)));
-    untie(%CachData);
-    untie(%GraphDat);
-}
+                if($_ > 1) {
+                    $ptr .= "*(part $_)";
+                    $Dis .= '&';
+                }
 
+		my ($pr_no,$dod)=split('&',$ptr);
+		my $DoDiff=$DoDiff{$dod};
+#               $r->print('<br>'.$name.'---'.$ptr.'==='.$DoDiff);
+
+                my $Fac = ($partData{$_.':Tries'}) ? 
+                    ($partData{$_.':awarded'}/$partData{$_.':tries'}) : 0;
+                my $DisF;
+                if($Fac > 0 &&  $Fac < 1) { 
+                    $DisF = sprintf( "%.4f", $Fac );
+                } else {
+                    $DisF = $Fac;
+                }
 
-# ------------------------------------- Find the section of student in a course
-
-sub usection {
-    my ($udom,$unam,$courseid,$ActiveFlag)=@_;
-    $courseid=~s/\_/\//g;
-    $courseid=~s/^(\w)/\/$1/;
-
-    my %result=&Apache::lonnet::dump('roles',$udom,$unam);
-    my ($checkForResult)=keys(%result);
-    if ($checkForResult=~/^(con_lost|error|no_such_host)/i) {
-	return -1;
-    }
-    foreach my $key (keys (%result)) {
-	my $value=$result{$key};
-        if ($key=~/^$courseid(?:\/)*(\w+)*\_st$/) {
-            my $section=$1;
-            if ($key eq $courseid.'_st') { $section=''; }
-	    my ($dummy,$end,$start)=split(/\_/,$value);
-	    if ( $ActiveFlag ne 'Any' ) {
-		my $now=time;
-		my $notactive=0;
-		if ($start) {
-		    if ($now<$start) { $notactive=1; }
-		}
-		if ($end) {
-		    if ($now>$end) { $notactive=1; }
-		}
-		if ((($ActiveFlag eq 'Expired') && $notactive == 1) || 
-                    (($ActiveFlag eq 'Active') && $notactive == 0 ) ) {
-		    return $section;
-		}
-		else { return '-1'; } 
-	    }
-	    return $section;
-        }
-    }
-    return '-1';
-}
+                if ($Discuss{"$name:$problem"}) {
+		    $TotDiscuss++;
+                    $Discussed=1;
+                }
+                my $time = $cache->{"$name:$LatestVersion:$problem:timestamp"};
+                $Dis .= $tempProblemOrder.'='.$DisF.'+'.$Yes;
+                $ptr .= '&'.$partData{$_.'.Tries'}.
+                        '&'.$partData{$_.'.Wrongs'}.
+                        '&'.$partData{$_.'.Code'};
+                push (@$list, $ptr."&$Discussed");
 
+####		if ($DoDiff>0.85) {
 
-# ------ Dump the Student's DB file and handling the data for statistics table 
-sub ExtractStudentData {
-    my $student=shift;
-    my ($sname,$sdom) = split( /\:/, $student );
-    my %result = &Apache::lonnet::dump($cid,$sdom,$sname);
-    my $ResId;
-    my $PrOrd;
-    my $Dis = '';
-    my $Code;
-    my $Tries;
-    my $ParCr;
-    my $TotalTries = 0;
-    my $TotalOpend = 0;
-    my $ProbSolved = 0;
-    my $ProbTot = 0;
-    my $TimeTot = 0;
-    my $TotParCr = 0;
-    my $Wrongs;
-    my %TempHash;
-    my $Version; 
-    my $LatestVersion;
-    my $SecLimit;
-    my $MapLimit;
-    my ($temp)=keys(%result);
-    unless ($temp=~/^(con_lost|error|no_such_host)/i) {
-        foreach my $CurCol(@cols) {
-	    ($PrOrd,$ResId)=split(/\:/,$CurCol);
-	    if ( !$CurCol ) { next; }
-            $ResId=~/(\d+)\.(\d+)/;
-	    my $MapId=$1;
-	    my $PrbId=$2;
-            my $MapOrg = $hash{'map_id_'.$MapId};
-            my $Map = &Apache::lonnet::declutter($MapOrg);
-            if ( $CurMap ne 'All Maps' ) {
-		my ( $ResMap, $NameMap ) = split(/\=/,$CurMap);
-		if ( $Map ne $ResMap ) { next; }
-	    }
-	    my $meta=$hash{'src_'.$ResId};
-	    my $PartNo = 0;
-	    $Dis .= ':';
-	    undef %TempHash;
-
-	    foreach (split(/\,/,&Apache::lonnet::metadata($meta,'keys'))) { 
-		if ($_=~/^stores\_(\w+)\_tries$/) {
-                    my $Part=&Apache::lonnet::metadata($meta,$_.'.part');
-		    if ( $TempHash{"$Part"} eq '' ) { 
-			$TempHash{"$Part"} = $Part;
-			$TempHash{$PartNo}=$Part;
-			$TempHash{"$Part.Code"} = 'U';  
-			$TempHash{"$Part.PrOrd"} = $PrOrd+$PartNo;
-			$PartNo++;
-		    }
-                    #my $Part=&Apache::lonnet::metadata($meta,$_.'.part');
-		}
-            }
-            &Apache::lonnet::declutter( $hash{'src_'.$ResId} );
-	    my $URI = $hash{'src_'.$ResId};
-            my $Prob = $Map.'___'.$PrbId.'___'.
-                       &Apache::lonnet::declutter($URI);
-            $Code='U';
-            $Tries = 0;
-	    $ParCr = 0;
-            $Wrongs = 0;
-  	    $LatestVersion = $result{"version:$Prob"};        
-	    if ( $LatestVersion ) {
-		for ( my $Version=1; $Version<=$LatestVersion; $Version++ ) {
-		    my $vkeys = $result{"$Version:keys:$Prob"};
-		    my @keys = split(/\:/,$vkeys);		
-		    foreach my $Key (@keys) {		  
-			if (($Key=~/\.(\w+)\.solved$/) && ($Key!~/^\d+\:/)) {
-			    my $Part = $1;
-			    $Tries = $result{"$Version:$Prob:resource.$Part.tries"};
-			    $ParCr = $result{"$Version:$Prob:resource.$Part.awarded"};
-			    my $Time = $result{"$Version:$Prob:timestamp"};
-			    $TempHash{"$Part.Time"} = ($Time) ? $Time : 0;
-			    $TempHash{"$Part.Tries"} = ($Tries) ? $Tries : 0;
-			    $TempHash{"$Part.ParCr"} = ($ParCr) ? $ParCr : 0;        
-			    $TotalTries += $TempHash{"$Part.Tries"};
-			    $TotParCr += $TempHash{"$Part.ParCr"};
-			    my $Val = $result{"$Version:$Prob:resource.$Part.solved"};
-			    if ( $Val eq 'correct_by_student' )
-                               { $Wrongs = $Tries - 1; $Code = 'C'; } 
-			    elsif ( $Val eq 'correct_by_override' )
-                               { $Wrongs = $Tries - 1; $Code = 'O'; }                        
-			    elsif ( $Val eq 'incorrect_attempted' || 
-                                $Val eq 'incorrect_by_override' )
-		               { $Wrongs = $Tries; $Code = 'I'; }
-			    $TempHash{"$Part.Code"} = $Code;
-			    $TempHash{"$Part.Wrongs"} = $Wrongs;
-			}
-     		    }
-                } 
-		for ( my $n = 0; $n < $PartNo; $n++ ) {		  
-		    my $part = $TempHash{$n};
-		    my $Yes = 0;
-                    if ( $TempHash{$part.'.Code'} eq 'C' ||
-                         $TempHash{$part.'.Code'} eq 'O'  ) 
-		       {$ProbSolved++;$Yes=1;}		
-
- #		    my $ptr = "$hash{'title_'.$ResId}";
-		    my $ptr = $TempHash{$part.'.PrOrd'}.'&'.$ResId;
-
-		    if ( $PartNo > 1 ) {                
-			$ptr .= "*(part $part)";
-			$Dis .= '&';
-		    }
-		    my $Fac = ($TempHash{"$part.Tries"}) ? 
-                              ($TempHash{"$part.ParCr"}/$TempHash{"$part.Tries"}) : 0;
-		    my $DisF;
-		    if ( $Fac > 0 &&  $Fac < 1 ) { 
-			$DisF = sprintf( "%.4f", $Fac );
-		    }
-		    else {$DisF = $Fac;}
-#		    $DisF .= '+'.$TempHash{"$part.Time"};33333333
-		    $TimeTot += $TempHash{"$part.Time"};
-		    $Dis .= $TempHash{$part.'.PrOrd'}.'='.$DisF.'+'.$Yes;
-		    $ptr .= "&$TempHash{$part.'.Tries'}".
-		            "&$TempHash{$part.'.Wrongs'}".
-                            "&$TempHash{$part.'.Code'}";
-		    push (@list, $ptr);
-		    $TotalOpend++;
-		    $ProbTot++;
+                $TimeTot += $time;
+
+                if ($Yes==1 && $partData{$_.'.Tries'}==1) {
+		    $TotFirst++;
+                }
+		my $Acts= $Activity{$name.':'.$problem};
+		if ($Acts) {
+		    my $Pt=&ProcAct( $Acts, $time );
+		    #my ($spe,$beg) = split(/\+/,$Pt);
+                    my $spe= $Pt;
+		    if ($Yes==1) {$spent_yes += $spe;}
+		    $spent += $spe;
+		    #$Beg += $beg;
+#                   $r->print('<br>'.$name.'---'.$problem.'---'.$spe);
 		}
+		$TotalOpend++;
+		$ProbTot++;
+
+                $tempProblemOrder++;
             }
-	    #else { 
-		#for(my $n=0; $n<$PartNo; $n++) {
-		#    push (@list, "$TempHash{'0'.'.PrOrd'}.':'.$ResId:0:0:U");
-		#    $ProbTot++; 
-		#}
-	    #}
         }
-	if ( $TotalTries ) {
-	    my $DisFac = ( $TotalTries ) ? ($TotParCr/$TotalTries) : 0;
+	my $pstr;
+        if($totalTries) {
+	    my $DisFac = ($totalAwarded/$totalTries);
 	    my $DisFactor = sprintf( "%.4f", $DisFac );
-	    $DiscFac{$DisFactor}=$Dis;
-	    #my $time;
-	    #if ($ProbSolved){
-		#$time = int(($TimeTot/$ProbSolved)-10000000);
-	    #}
-	    #$DiscFac{($DisFactor.':'.$sname.':'.$ProbTot.':'.$TotalOpend.':'.
-            #          $TotalTries.':'.$ProbSolved.':'.$time)}=$Dis;
+            my $TS = sprintf( "%.2f", $spent );
+            my $TS_yes = sprintf( "%.2f", $spent_yes );
+	   # $DiscFac{$DisFactor}=$Dis;
+	    $pstr=$DisFactor.':'.$name.':'.$ProbTot.':'.$TotalOpend.':'.
+                  $totalTries.':'.$ProbSolved.':'.$TotFirst.':'.
+                  $TS_yes.':'.$TS.':'.$TotDiscuss;
+	    $discriminantFactor{$pstr}=$Dis;
 	}
     }
-    #$r->print($sname.' PrCr= '.$TotParCr.' Slvd= '.$ProbSolved.' Tries='.$TotalTries.'<br>');
-}
 
-
-
-# ------------------------------------------------------------ Build page table
-sub tracetable {
-    my ($rid,$beenhere)=@_;
-    my $IsMap=0;
-    $rid=~/(\d+)\.(\d+)/;
-    $maps{&Apache::lonnet::declutter($hash{'map_id_'.$1})}='';#$hash{'title_'.$rid}; 
-    #$maps{$HWN}=$hash{'title_'.$rid}; 
-    unless ($beenhere=~/\&$rid\&/) {
-       $beenhere.=$rid.'&'; 
-       if (defined($hash{'is_map_'.$rid})) {
-	   my $cmap=$hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$rid}}};
-           if ( $cmap eq 'sequence' || $cmap eq 'page' ) { 
-               $cols[$#cols+1]=0;
-	       $P_Order++;
-	       $HWN=$P_Order;
-               $mapsort{$HWN} = $rid.':';
-	       $IsMap=1;
- 
-               #$maps{&Apache::lonnet::declutter($hash{'src_'.$rid})}= 
-               #      $hash{'title_'.$rid}; 
-           }
-           if ((defined($hash{'map_start_'.$hash{'src_'.$rid}})) &&
-               (defined($hash{'map_finish_'.$hash{'src_'.$rid}}))) {
-	       my $frid=$hash{'map_finish_'.$hash{'src_'.$rid}};
-
-               &tracetable($hash{'map_start_'.$hash{'src_'.$rid}},
-			   '&'.$frid.'&');
-
-	       $cols[$#cols+1]=($P_Order+1).':'.$frid;
-      
-	       my $meta=$hash{'src_'.$frid};
-	       my $PartNo = 0;
-	       my $Part;
-	#       if ($IsMap==0){
-               if ($meta) {
-		   if ($meta=~/\.(problem|exam|quiz|assess|survey|form)$/) {
-		       foreach (split(/\,/,&Apache::lonnet::metadata($meta,'keys'))) {
-			   if ($_=~/^stores\_(\w+)\_tries$/) {
-			       $Part=&Apache::lonnet::metadata($meta,$_.'.part');
-			       $P_Order++;
-			       $mapsort{$HWN} .= '&'.$P_Order;
-			       $PartNo++;
-			       #$r->print('<br>'.$PartNo.'---'.$P_Order);
-			   }
-			   foreach my $K(split(/\,/,&Apache::lonnet::metadata($meta,'packages'))) {
-			       if ($K=~/^optionresponse\_($Part)\_(\w+)$/) {
-				   #$r->print('<br>'.$_.'...'.$P_Order.'---'.$Part);
-				   $OpResp{$P_Order}="$frid:$Part";
-			       } 
-			   }
-		       }
-		   }
-               }
-	   }
-	 #  }
-       } else {
-	   $cols[$#cols+1]=($P_Order+1).':'.$rid;
-	   my $meta=$hash{'src_'.$rid};
-	   my $PartNo = 0;
-	   if ($meta) {
-	       if ($meta=~/\.(problem|exam|quiz|assess|survey|form)$/) {
-		   foreach my $Key(split(/\,/,&Apache::lonnet::metadata($meta,'keys'))) {
-		       if ($Key=~/^stores\_(\w+)\_tries$/) {
-			   my $Part=&Apache::lonnet::metadata($meta,$Key.'.part');
-			   $P_Order++;
-			   $mapsort{$HWN} .= '&'.$P_Order;
-			   $PartNo++;
-			   foreach (split(/\,/,&Apache::lonnet::metadata($meta,'packages'))) {
-			       if ($_=~/^optionresponse\_($Part)\_(\w+)$/) {
-				   #$r->print('<br>'.$_.'...'.$P_Order.'---'.$Part);
-				   $OpResp{$P_Order}="$rid:$Part";;
-			       } 
-		   
-			   }
-
-		       }
-		   }
-	       }
-	   }       
-       }
-       if (defined($hash{'to_'.$rid})) {
-          foreach (split(/\,/,$hash{'to_'.$rid})){
-              &tracetable($hash{'goesto_'.$_},$beenhere);
-          }
-       }
-    }
+    return (\%discriminantFactor);
 }
 
+
+=pod
 sub MySort {          
     if ( $Pos > 0 ) {
 	if ($ENV{'form.order'} eq 'Descending') {$b <=> $a;}
@@ -1029,74 +848,50 @@ sub MySort {
 	else { $a cmp $b; }
     }
 }
+=cut
 
-sub Create_PrgWin {
-#----------- Create progress
-    $r->print(<<ENDPOP);
-    <script>
-    popwin=open('','popwin','width=400,height=100');
-    popwin.document.writeln('<html><body bgcolor="#88DDFF">'+
-      '<title>LON-CAPA Statistics</title>'+
-      '<h4>Computation Progress</h4>'+
-      '<form name=popremain>'+
-      '<input type=text size=35 name=remaining value=Starting></form>'+
-      '</body></html>');
-    popwin.document.close();
-    </script>
-ENDPOP
-
-    $r->rflush();
-}
-
-
-sub Update_PrgWin {
-#----------- update progress
-    my $index = shift;
-    $r->print('<script>popwin.document.popremain.remaining.value="'.
-              'Computing '.($index+1).'/'.($#students+1).': '.
-              $students[$index].'";</script>');
-    $r->rflush();
-}
+sub BuildStatisticsTable {
+    my ($cache,$discriminantFactor,$list,$headings,$students)=@_;
 
-sub Close_PrgWin {
-#--------------------- close Progress Line
-    $r->print('<script>popwin.close()</script>');
-    $r->rflush(); 
-}
-
-sub Build_Statistics {
+#6666666
+#    my $file="/home/httpd/perl/tmp/183d.txt";
+#    open(OUT, ">$file");
+#6666666
     &Create_PrgWin();
-# ---------------------------- Gathering the Data of students' tries
-    for (my $index=0;$index<=$#students;$index++) {
-	&Update_PrgWin($index);
-        &ExtractStudentData($students[$index]);
-    }
+##777777
+##    &LoadActivityLog();
+##    $r->print('<script>popwin.document.popremain.remaining.value="'.
+##              'Loading Discussion...";</script>');
+##    &LoadDoDiffFile();
+    &LoadDiscussion();
+
+    my $p_count = 0;
+    my $nIndex = 0;
+    my $dummy;
+    my $p_val;
+    my $ResId;
+    my $NoElements = scalar @$list;
 
-# -------------------- sorting the Data
-    $r->print('<script>popwin.document.popremain.remaining.value="'.
-              'Calculating Discrimination Factors...";</script>');
+    foreach my $sequence (split(':', $cache->{'orderedSequences'})) {
+        if($cache->{'ProblemStatisticsMap'} ne 'All Maps'  &&
+           $cache->{'ProblemStatisticsMap'} ne $cache->{$sequence.':title'}) {
+            next;
+        }
 
-    @list = sort (@list);
+	&CreateProblemStatisticsTableHeading($cache->{'DisplayFormat'},
+                                             $cache->{$sequence.':source'}, 
+                                             $cache->{$sequence.':title'},
+                                             $headings);
+
+##777777
+##    &Classify($discriminantFactor, $students);
 
-    &Discriminant();
 
-    $OpSel2='';
-    $OpSel1='selected';
- 		   
-    $p_count = 0; 
-    my $nIdx = 0;
-    my $dummy; 
-    my $p_val;
-    my $ResId;
-    my $NoElements = $#list + 1;
-#-------------------------------- loop for data representation
-    foreach (sort keys %mapsort) {
 	my ($Hid,$pr)=split(/\:/,$mapsort{$_});
 	my @lpr=split(/\&/,$pr);
-	&CreateTable(1,$Hid);
 	for (my $i=1; $i<=$#lpr; $i++) {
 	    my %storestats=();
-	    my ($PrOrd,$Prob,$Tries,$Wrongs,$Code)=split(/\&/,$list[$nIdx]);
+	    my ($PrOrd,$Prob,$Tries,$Wrongs,$Code,$Disc)=split(/\&/,$list->[$nIndex]);
 	    my $Temp = $Prob;
 	    my $MxTries = 0;
 	    my $TotalTries = 0;
@@ -1104,10 +899,11 @@ sub Build_Statistics {
 	    my $Incorrect = 0;
 	    my $Override = 0;
 	    my $StdNo = 0;
+	    my $DiscNo=0;
 	    my @StdLst;
 	    while ( $PrOrd == $lpr[$i] ) 
 	    {
-		$nIdx++;
+		$nIndex++;
 		$StdNo++;
 		$StdLst[ $StdNo ] = $Tries;
 		$TotalTries += $Tries;
@@ -1116,7 +912,7 @@ sub Build_Statistics {
 		elsif( $Code eq 'I' ) { $Incorrect++; }
 		elsif( $Code eq 'O' ) { $Override++; }
 		elsif( $Code eq 'U' ) { $StdNo--; }
-		($PrOrd,$Prob,$Tries,$Wrongs,$Code)=split(/\&/,$list[$nIdx]);
+		($PrOrd,$Prob,$Tries,$Wrongs,$Code,$Disc)=split(/\&/,$list->[$nIndex]);
 	    }	
 
 	    $p_count++;
@@ -1179,8 +975,8 @@ sub Build_Statistics {
 	    }
 
 #--------------------- Compute the Discrimination Factors
-	    my ($Up1,$Up2)=split(/\:/,$DisUp{$lpr[$i]});
-	    my ($Lw1,$Lw2)=split(/\:/,$DisLow{$lpr[$i]});
+            my ($Up1,$Up2)=split(/\:/,':');#jason$DisUp->{$lpr[$i]});
+	    my ($Lw1,$Lw2)=split(/\:/,':');#jason$DisLow->{$lpr[$i]});
 	    my $Dis1 = $Up1 - $Lw1;
 	    my $Dis2 = $Up2 - $Lw2;
 	    my $_D1 = sprintf("%.2f", $Dis1);
@@ -1196,24 +992,32 @@ sub Build_Statistics {
                        $TotalTries.'&'.$MxTries.'&'.$Avg.'&'.
                        $YES.'&'.$Override.'&'.$Wrng.'&'.$DoD.'&'.
 		       $SD.'&'.$Sk.'&'.$_D1.'&'.$_D2.'&'.
-                       $Prob;
+                       $DiscNo.'&'.$Prob;
 	    $CachData{($p_count-1)}=$join;
 
+#6666666
+#	    $r->print('<br>'.$out.'&'.$DoD);
+#            print (OUT $out.'@'.$DoD.'&');
+#6666666
+
 	    $urlres=~/^(\w+)\/(\w+)/;
 	    if ($StdNo) { 
 		&Apache::lonnet::put('resevaldata',\%storestats,$1,$2); 
 	    }
 #-------------------------------- Row of statistical table
-	    if ( $DiscFlag == 0 ) {
-		&TableRow($join,$i,($p_count-1));
-	    } 
+            &TableRow($cache,$join,$i,($p_count-1));
 	}
-	&CloseTable();
+	&CloseTable($cache);
     }
     &Close_PrgWin();
+#666666
+#    close( OUT );
+#666666
 }
 
+=pod
 sub Cache_Statistics {
+    my ($cache)=@_;
     my @list = ();
     my $Useful;
     my $UnUseful;
@@ -1221,7 +1025,7 @@ sub Cache_Statistics {
     my %myHeader = reverse( %Header );
     $Pos = $myHeader{$ENV{'form.sort'}};
     if ($Pos > 0) {$Pos++;}
-    $p_count = 0;
+    my $p_count = 0;
     foreach my $key( keys %CachData) { 
 	my @Temp=split(/\&/,$CachData{$key});
 	if ( $Pos == 0 ) {
@@ -1236,36 +1040,39 @@ sub Cache_Statistics {
 
     @list = sort MySort (@list);
 
-    my $nIdx=0;
+    my $nIndex=0;
 
     if ( $Pos == 0 ) {
 	foreach (sort keys %mapsort) {
 	    my ($Hid,$pr)=split(/\:/,$mapsort{$_});
-	    &CreateTable(1,$Hid);
+	    &CreateProblemStatisticsTableHeading($cache,1,$Hid);
 	    my @lpr=split(/\&/,$pr);
 	    for (my $i=1; $i<=$#lpr; $i++) {
-		my($Pre, $Post) = split(/\@/,$list[$nIdx]); 
+		my($Pre, $Post) = split(/\@/,$list[$nIndex]); 
 		#$r->print('<br>'.$Pre.'---'.$Post);
-		&TableRow($Post,$i,$nIdx);
-		$nIdx++;
+		&TableRow($cache,$Post,$i,$nIndex);
+		$nIndex++;
 	    }
-	    &CloseTable();
+	    &CloseTable($cache);
 	}
     }
     else {
-	&CreateTable(0);
-	for ( my $nIdx = 0; $nIdx < $p_count; $nIdx++ ) {
-	    my($Pre, $Post) = split(/\@/,$list[$nIdx]); 
-	    &TableRow($Post,$nIdx,$nIdx);
+	&CreateProblemStatisticsTableHeading($cache,0);
+	for ( my $nIndex = 0; $nIndex < $p_count; $nIndex++ ) {
+	    my($Pre, $Post) = split(/\@/,$list[$nIndex]); 
+	    &TableRow($cache,$Post,$nIndex,$nIndex);
 	} 
-	&CloseTable();
+	&CloseTable($cache);
     }
 }
+=cut 
+
+
 
 sub TableRow {
     my ($Str,$Idx,$RealIdx)=@_;
     my($PrOrd,$Temp,$StdNo,$TotalTries,$MxTries,$Avg,$YES,$Override,
-       $Wrng,$DoD,$SD,$Sk,$_D1,$_D2,$Prob)=split(/\&/,$Str);	
+       $Wrng,$DoD,$SD,$Sk,$_D1,$_D2,$DiscNo,$Prob)=split(/\&/,$Str);	
     if ($ENV{'form.showcsv'}) {
         my ($ResId,$Dummy)=split(/\*/,$Prob);
         my $Ptr =  "\n".'<br>'.
@@ -1283,7 +1090,9 @@ sub TableRow {
                "\n".'"'.$SD.'",'.
                "\n".'"'.$Sk.'",'.
                "\n".'"'.$_D1.'",'.
-	       "\n".'"'.$_D2.'"';
+	       "\n".'"'.$_D2.'"'.
+	       "\n".'"'.$DiscNo.'"';
+
         $r->print("\n".$Ptr);
     }
     else{
@@ -1291,23 +1100,158 @@ sub TableRow {
                "\n".'<td>'.($RealIdx+1).'</td>'.
           #     "\n".'<td>'.$PrOrd.$Temp.'</td>'.
                "\n".'<td>'.$Temp.'</td>'.
-               "\n".'<td bgcolor="#EEFFCC"> '.$StdNo.'</td>'.
-               "\n".'<td bgcolor="#EEFFCC">'.$TotalTries.'</td>'.
-               "\n".'<td bgcolor="#EEFFCC">'.$MxTries.'</td>'.
-               "\n".'<td bgcolor="#DDFFFF">'.$Avg.'</td>'.
-               "\n".'<td bgcolor="#DDFFFF"> '.$YES.'</td>'.
-               "\n".'<td bgcolor="#DDFFFF"> '.$Override.'</td>'.
-               "\n".'<td bgcolor="#FFDDDD"> '.$Wrng.'</td>'.
-               "\n".'<td bgcolor="#FFDDDD">'.$DoD.'</td>'.
-               "\n".'<td bgcolor="#DDFFDD"> '.$SD.'</td>'.
-               "\n".'<td bgcolor="#DDFFDD"> '.$Sk.'</td>'.
-               "\n".'<td bgcolor="#FFDDFF"> '.$_D1.'</td>'.
-	       "\n".'<td bgcolor="#FFDDFF"> '.$_D2.'</td>';
+               "\n".'<td bgcolor='.$color{"yellow"}.'> '.$StdNo.'</td>'.
+               "\n".'<td bgcolor='.$color{"yellow"}.'>'.$TotalTries.'</td>'.
+               "\n".'<td bgcolor='.$color{"yellow"}.'>'.$MxTries.'</td>'.
+               "\n".'<td bgcolor='.$color{"gb"}.'>'.$Avg.'</td>'.
+               "\n".'<td bgcolor='.$color{"gb"}.'> '.$YES.'</td>'.
+               "\n".'<td bgcolor='.$color{"gb"}.'> '.$Override.'</td>'.
+               "\n".'<td bgcolor='.$color{"red"}.'> '.$Wrng.'</td>'.
+               "\n".'<td bgcolor='.$color{"red"}.'> '.$DoD.'</td>'.
+               "\n".'<td bgcolor='.$color{"green"}.'> '.$SD.'</td>'.
+               "\n".'<td bgcolor='.$color{"green"}.'> '.$Sk.'</td>'.
+               "\n".'<td bgcolor='.$color{"purple"}.'> '.$_D1.'</td>'.
+	       "\n".'<td bgcolor='.$color{"purple"}.'> '.$_D2.'</td>'.
+               "\n".'<td bgcolor='.$color{"yellow"}.'> '.$DiscNo.'</td>';
         $r->print("\n".$Ptr.'</tr>' );
     }
     $GraphDat{$RealIdx}=$DoD.':'.$Wrng;
 }
 
+sub StatusOptions {
+    my ($cache)=@_;
+
+    my $Status = $cache->{'Status'};
+    my $OpSel1 = '';
+    my $OpSel2 = '';
+    my $OpSel3 = '';
+
+    if($Status eq 'Any')         { $OpSel3 = ' selected'; }
+    elsif($Status eq 'Expired' ) { $OpSel2 = ' selected'; }
+    else                         { $OpSel1 = ' selected'; }
+
+    my $Ptr = '';
+    $Ptr .= '<tr><td align="right"><b>Student Status:</b></td>'."\n";
+    $Ptr .= '<td align="left"><select name="Status">';
+    $Ptr .= '<option'.$OpSel1.'>Active</option>'."\n";
+    $Ptr .= '<option'.$OpSel2.'>Expired</option>'."\n";
+    $Ptr .= '<option'.$OpSel3.'>Any</option>'."\n";
+    $Ptr .= '</select></td></tr>'."\n";
+
+    return $Ptr;
+}
+
+sub AscendOrderOptions {
+    my ($cache)=@_;
+
+    my $order = $cache->{'Ascend'};
+    my $OpSel1 = '';
+    my $OpSel2 = '';
+
+    if($order eq 'Ascending') {
+        $OpSel1 = ' selected';
+    } else {
+        $OpSel2 = ' selected';
+    }
+
+    my $Ptr = '';
+    $Ptr .= '<tr><td align="right"><b>Sorting Type:</b></td>'."\n";
+    $Ptr .= '<td align="left"><select name="Ascend">'."\n";
+    $Ptr .= '<option'.$OpSel1.'>Ascending</option>'."\n".
+	    '<option'.$OpSel2.'>Descending</option>'."\n";
+    $Ptr .= '</select></td></tr>'."\n";
+
+    return $Ptr;
+}
+
+sub ProblemStatisticsButtons {
+    my ($cache)=@_;
+
+    my $Ptr = '<tr><td></td><td align="left">';
+    $Ptr .= '<input type=submit name="ProblemStatisticsRecalculate" ';
+    $Ptr .= 'value="Recalculate Statistics"/>'."\n";
+    $Ptr .= '&nbsp;&nbsp;&nbsp;';
+    $Ptr .= '<input type="submit" name="DoDiffGraph" ';
+    $Ptr .= 'value="DoDiff Graph" />'."\n";
+    $Ptr .= '&nbsp;&nbsp;&nbsp;';
+    $Ptr .= '<input type="submit" name="PercentWrongGraph" ';
+    $Ptr .= 'value="%Wrong Graph" />'."\n";
+    $Ptr .= '&nbsp;&nbsp;&nbsp;';
+    $Ptr .= '<input type="submit" name="DisplayCSVFormat" ';
+    if($cache->{'DisplayFormat'} eq 'Display CSV Format') {
+        $Ptr .= 'value="Display CSV Format" />'."\n";
+    } else {
+        $Ptr .= 'value="Display Table Format" />'."\n";
+    }
+    $Ptr .= '</td></tr>';
+
+    return $Ptr;
+}
+
+sub ProblemStatisticsLegend {
+    my $Ptr = '';
+    $Ptr = '<table border="0">';
+    $Ptr .= '<tr><td>';
+    $Ptr .= '<b>#Stdnts</b>:</td>';
+    $Ptr .= '<td>Total Number of Students opened the problem.';
+    $Ptr .= '</td></tr><tr><td>';
+    $Ptr .= '<b>Tries</b>:</td>';
+    $Ptr .= '<td>Total Number of Tries for solving the problem.';
+    $Ptr .= '</td></tr><tr><td>';
+    $Ptr .= '<b>Mod</b>:</td>';
+    $Ptr .= '<td>Maximunm Number of Tries for solving the problem.';
+    $Ptr .= '</td></tr><tr><td>';
+    $Ptr .= '<b>Mean</b>:</td>';
+    $Ptr .= '<td>Average Number of the tries. [ Tries / #Stdnts ]';
+    $Ptr .= '</td></tr><tr><td>';
+    $Ptr .= '<b>#YES</b>:</td>';
+    $Ptr .= '<td>Number of students solved the problem correctly.';
+    $Ptr .= '</td></tr><tr><td>';
+    $Ptr .= '<b>#yes</b>:</td>';
+    $Ptr .= '<td>Number of students solved the problem by override.';
+    $Ptr .= '</td></tr><tr><td>';
+    $Ptr .= '<b>%Wrng</b>:</td>';
+    $Ptr .= '<td>Percentage of students tried to solve the problem ';
+    $Ptr .= 'but still incorrect. [ 100*((#Stdnts-(#YES+#yes))/#Stdnts) ]';
+    $Ptr .= '</td></tr><tr><td>';
+#    Kashy formula
+#    '<b>  DoDiff </b>: Degree of Difficulty of the problem.<br>'.
+#    '[ Tries/(#YES+#yes+0.1) ]<br>'.
+    #Gerd formula
+    $Ptr .= '<b>DoDiff</b>:</td>';
+    $Ptr .= '<td>Degree of Difficulty of the problem.  ';
+    $Ptr .= '[ 1 - ((#YES+#yes) / Tries) ]';
+    $Ptr .= '</td></tr><tr><td>';
+    $Ptr .= '<b>S.D.</b>:</td>';
+    $Ptr .= '<td>Standard Deviation of the tries.  ';
+    $Ptr .= '[ sqrt(sum((Xi - Mean)^2)) / (#Stdnts-1) ';
+    $Ptr .= 'where Xi denotes every student\'s tries ]';
+    $Ptr .= '</td></tr><tr><td>';
+    $Ptr .= '<b>Skew.</b>:</td>';
+    $Ptr .= '<td>Skewness of the students tries.';
+    $Ptr .= '[(sqrt( sum((Xi - Mean)^3) / #Stdnts)) / (S.D.^3)]';
+    $Ptr .= '</td></tr><tr><td>';
+    $Ptr .= '<b>Dis.F.</b>:</td>';
+    $Ptr .= '<td>Discrimination Factor: A Standard for evaluating the ';
+    $Ptr .= 'problem according to a Criterion<br>';
+    $Ptr .= '<b>[Applied Criterion in %27 Upper Students - ';
+    $Ptr .= 'Applied the same Criterion in %27 Lower Students]</b><br>';
+    $Ptr .= '<b>1st Criterion</b> for Sorting the Students: ';
+    $Ptr .= '<b>Sum of Partial Credit Awarded / Total Number of Tries</b><br>';
+    $Ptr .= '<b>2nd Criterion</b> for Sorting the Students: ';
+    $Ptr .= '<b>Total number of Correct Answers / Total Number of Tries</b>';
+    $Ptr .= '</td></tr>';
+    $Ptr .= '<tr><td><b>Disc.</b></td>';
+    $Ptr .= '<td>Number of Students had at least one discussion.';
+    $Ptr .= '</td></tr></table>';
+
+    return $Ptr;
+}
+
+#---- END Problem Statistics Web Page ----------------------------------------
+
+#---- Problem Statistics Graph Web Page --------------------------------------
+
 # ------------------------------------------- Prepare data for Graphical chart
 
 sub GetGraphData {
@@ -1352,354 +1296,862 @@ sub GetGraphData {
 	}
     }
 }
+#---- Problem Analysis Web Page ----------------------------------------------
 
+sub IntervalOptions {
+    my ($cache)=@_;
 
-sub initial {
-# --------------------------------- Initialize the global varaibles
-  undef @students;
-  undef @cols;
-  undef %maps;
-  undef %section;
-  undef %StuBox;
-  undef @list;
-  undef %CachData;
-  undef %GraphDat;
-  undef %DiscFac;
-  undef %OpResp;
-  undef %ConceptData;
-  undef $CurMap;
-  undef $CurSec;
-  undef $CurStu;
-  undef $p_count;
-  undef $Pos;
-  undef $GData;
-  $DiscFlag=0; 
-  $P_Order=100000;
-  $HWN=$P_Order;
-}
-
-#	my $CacheDB = "/home/httpd/perl/tmp/$ENV{'user.name'}".
-#                  "_$ENV{'user.domain'}_$cid\_classlist.db";
-#	if (-e "$CacheDB") {
-#	    if (tie(%students,'GDBM_File',"$CacheDB",&GDBM_READER,0640)) {
-#		&CachClassList();
-#	    }
-#            else {
-#	        $r->print("Unable to tie hash to db file");
-#            }
-#        }
-#        else {
-#	    if (tie(%students,'GDBM_File',$CacheDB,&GDBM_WRCREAT,0640)) {
-#	        &MakeClassList();
-#	    }
-#            else {
-#	        $r->print("Unable to tie hash to db file");
-#            }
-#        }
-#        untie(%students);
+    my $interval = 1;
+    for(my $n=1; $n<=7; $n++) {
+        if($cache->{'Interval'} == $n) {
+            $interval = $n;
+        }
+    }
 
+    my $Ptr = '<br><b>Select number of intervals</b>'."\n".
+       	      '<select name="Interval">'."\n";
+    for(my $n=1; $n<=7;$ n++) {
+	$Ptr .= '<option';
+        if($interval == $n) {
+            $Ptr .= ' selected';
+        }
+	$Ptr .= '>'.$n."</option>"."\n";
+    }
+    $Ptr .= '</select>'."\n";
 
-sub ClassList {
+    return $Ptr;
+}
 
-    &GetStatus();
+sub OptionResponseTable {
+    my ($cache)=@_;
+    my $Str = '';
+    $Str .= '<br><b> Option Response Problems in this course:</b>'."\n";
+    $Str .= '<br><br>'."\n";
+    $Str .= "<table border=2><tr><th> \# </th><th> Problem Title </th>";
+    $Str .= '<th> Resource </th><th> Analysis  </th></tr>'."\n";
+
+    my $number=1;
+    foreach (split(':::',$cache->{'OptionResponses'})) {
+        my ($uri,$title,$part,$problem)=split('::',$_);
+        my $Temp = '<a href="'.$uri.'" target="_blank">'.$title.'</a>';
+        $Str .= '<tr>';
+        $Str .= '<td> '.$number.' </td>';
+        $Str .= '<td bgcolor="'.$color{"green"}.'"> '.$Temp.' </td>';
+        $Str .= '<td bgcolor="'.$color{"yellow"}.'"> '.$uri.' </td>';
+        $Str .= '<td><input type="submit" name="Analyze:::'.$uri.':::';
+        $Str .= $title.':::'.$part.':::'.$problem.'" value="';
+        $Str .= 'Analyze" /></td></tr>'."\n";
+        $number++;
+    }
+    $Str .= '</table>'."\n";
 
-    $cid=$ENV{'request.course.id'};
-    my ($cdom,$cnum)=split(/\_/,$cid);
-# ----------------------- Get first and last resource, see if there is anything
-    $firstres=$hash{'map_start_/res/'.$ENV{'request.course.uri'}};
-    $lastres=$hash{'map_finish_/res/'.$ENV{'request.course.uri'}};
-    if (($firstres) && ($lastres)) {
-#	my %students = &Apache::lonnet::dump('classlist',$cdom,$cnum);
-#    $Apache::lonxml::debug=1;
-#    &Apache::lonhomework::showhash(%students);
-#    $Apache::lonxml::debug=0;
-#	my $StudNo = 0;
-#	my $now=time;
-#	my ($temp)=keys(%students);
-#	unless ($temp=~/^error\:/) {
-#	    foreach my $KeyPoint(sort keys(%students)) {
+    return $Str;
+}
 
+#---- END Problem Analysis Web Page ------------------------------------------
 
-	my $StudNo = 0;
-	my $now=time;
+#---- Student Assessment Web Page --------------------------------------------
 
-	my %classlist=&Apache::lonnet::dump('classlist',$cdom,$cnum);
+# ------ Create different Student Report 
+sub StudentReport {
+    my ($cache, $name)=@_;
 
-	my ($checkForError)=keys(%classlist);
-	if($checkForError=~/^(con_lost|error|no_such_host)/i) {
-	    $r->print('<h1>Could not access course data</h1>');
-	} else {
-	    foreach my $name (keys (%classlist)) {
-		my $value=$classlist{$name};
-		my ($end,$start)=split(/\:/,$value);
-		my $active=1;
-		my $Status=$ENV{'form.status'};
-		$Status = ($Status) ? $Status : 'Active';
-		if ( ( ($end) && $now > $end ) && 
-		     ( ($Status eq 'Active') ) ) { $active=0; }
-		if ( ($Status eq 'Expired') && 
-		     ($end == 0 || $now < $end) ) { $active=0; }
-		if ($active) {
-		    my $thisindex=$#students+1;
-		    $students[$thisindex]=$name;
-		    my ($sname,$sdom)=split(/\:/,$name);
-		    my $ssec=&usection($sdom,$sname,$cid,$Status);
-		    if ($ssec==-1 || $ssec eq 'adm' ) {next;}
-		    $ssec=($ssec) ? $ssec : '(none)';
-		    #$ssec=(int($ssec)) ? int($ssec) : $ssec;
-		    $section{$ssec}=$ssec;
-		    if ($CurSec eq 'All Sections' || $ssec eq $CurSec) {
-			$students[$StudNo]=$name;
-			$StuBox{$sname}=$sdom;
-		    }
-		    $StudNo++;
-		}
-	    }
-	}
+    my $Str = '';
+    if($cache->{$name.':error'} =~ /course/) {
+        my ($username)=split(':',$name);
+        $Str .= '<b><font color="blue">No course data for student </font>';
+        $Str .= '<font color="red">'.$username.'.</font></b><br>';
+        return $Str;
+    }
+
+    $Str .= "<table border=2><tr><th> \# </th><th> Set Title </th>";
+    $Str .= '<th> Results </th><th> Tries </th></tr>'."\n";
+
+    my $codes;
+    my $attempts;
+    foreach my $sequence (split(':', $cache->{'orderedSequences'})) {
+        if($cache->{'StudentAssessmentMap'} ne 'All Maps'  &&
+           $cache->{'StudentAssessmentMap'} ne $cache->{$sequence.':title'}) {
+            next;
+        }
 
-        $r->print("Total number of students : ".($#students+1));
-        $r->rflush();
-# --------------- Find all assessments and put them into some linear-like order
-	&tracetable($firstres,'&'.$lastres.'&');
-#    my $c=0;
-#    foreach (sort keys %mapsort) {
-#	$r->print('<br>'.$c.')'.$_.' ... '.$mapsort{$_});
-#	$c++;
-#    }
-#	my $c=1;
-#	foreach (sort keys %OpResp) {
-#	    $r->print('<br>'.$c.')'.$_.' ... '.$OpResp{$_}.' ... '.$hash{'src_'.$OpResp{$_}});
-#	    $c++;
-#	}
+        $Str .= '<tr><td>'.$sequence.'</td>';
+        $Str .= '<td>'.$cache->{$sequence.':title'}.'</td>';
 
+        $codes = '';
+        $attempts = '';
+        foreach my $problemID (split(':', $cache->{$sequence.':problems'})) {
+            my $problem = $cache->{$problemID.':problem'};
+            my $LatestVersion = $cache->{$name.':version:'.$problem};
+
+            # Output dashes for all the parts of this problem if there
+            # is no version information about the current problem.
+            if(!$LatestVersion) {
+                foreach my $part (split(/\:/,$cache->{$sequence.':'.
+                                                      $problemID.
+                                                      ':parts'})) {
+		    $codes    .= "-,";
+                    $attempts .= "0,"; 
+                }
+                next;
+            }
+
+            my %partData=undef;
+            # Initialize part data, display skips correctly
+            # Skip refers to when a student made no submissions on that
+            # part/problem.
+            foreach my $part (split(/\:/,$cache->{$sequence.':'.
+                                                  $problemID.
+                                                  ':parts'})) {
+                $partData{$part.':tries'}=0;
+                $partData{$part.':code'}='-';
+            }
+
+            # Looping through all the versions of each part, starting with the
+            # oldest version.  Basically, it gets the most recent 
+            # set of grade data for each part.
+	    for(my $Version=1; $Version<=$LatestVersion; $Version++) {
+                foreach my $part (split(/\:/,$cache->{$sequence.':'.
+                                                      $problemID.
+                                                      ':parts'})) {
+
+                    if(!defined($cache->{$name.":$Version:$problem".
+                                               ":resource.$part.solved"})) {
+                        # No grade for this submission, so skip
+                        next;
+                    }
+
+                    my $tries=0;
+                    my $code='U';
+
+                    $tries = $cache->{$name.":$Version:$problem".
+                                      ":resource.$part.tries"};
+                    $partData{$part.':tries'}=($tries) ? $tries : 0;
+
+                    my $val = $cache->{$name.":$Version:$problem".
+                                       ":resource.$part.solved"};
+                    if    ($val eq 'correct_by_student')   {$code = 'Y';} 
+                    elsif ($val eq 'correct_by_override')  {$code = 'y';}
+                    elsif ($val eq 'incorrect_attempted')  {$code = 'N';} 
+                    elsif ($val eq 'incorrect_by_override'){$code = 'N';}
+                    elsif ($val eq 'excused')              {$code = 'x';}
+                    $partData{$part.':code'}=$code;
+                }
+            }
+
+            # Loop through all the parts for the current problem in the 
+            # correct order and prepare the output
+            foreach (split(/\:/,$cache->{$sequence.':'.$problemID.
+                                         ':parts'})) {
+                $codes    .= $partData{$_.':code'}.',';
+                $attempts .= $partData{$_.':tries'}.','; 
+            }
+        }
+        $codes    =~ s/,$//;
+        $attempts =~ s/,$//;
+        $Str .= '<td>'.$codes.'</td>';
+        $Str .= '<td>'.$attempts.'</td>';
+        $Str .= '</tr>'."\n";
     }
 
-# ------------------------------------------------------------- End render page 
-    else {
-	$r->print('<h3>Undefined course sequence</h3>');
+    $Str .= '</table>'."\n";
+
+    return $Str;
+}
+
+#---- END Student Assessment Web Page ----------------------------------------
+
+#---- Menu Web Page ----------------------------------------------------------
+
+#---- END Menu Web Page ------------------------------------------------------
+
+#---- HELPER FUNCTIONS -------------------------------------------------------
+
+sub CheckFormElement {
+    my ($cache, $ENVName, $cacheName, $default)=@_;
+
+    if(defined($ENV{'form.'.$ENVName})) {
+        $cache->{$cacheName} = $ENV{'form.'.$ENVName};
+    } elsif(!defined($cache->{$cacheName})) {
+        $cache->{$cacheName} = $default;
     }
+
+    return;
 }
 
+sub ProcessFormData{
+    my ($cache)=@_;
+
+    $cache->{'reportKey'} = 'false';
+
+    &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
+                                            ['sort','download']);
+    &CheckFormElement($cache, 'Status', 'Status', 'Active');
+    &CheckFormElement($cache, 'postdata', 'reportSelected', 'Class list');
+    &CheckFormElement($cache, 'reportSelected', 'reportSelected', 
+                      'Class list');
+    &CheckFormElement($cache, 'DownloadAll', 'DownloadAll', 'false');
+    &CheckFormElement($cache, 'sort', 'sort', 'fullname');
+    &CheckFormElement($cache, 'download', 'download', 'false');
+
+    if(defined($ENV{'form.CreateStudentAssessment'}) ||
+       defined($ENV{'form.NextStudent'}) ||
+       defined($ENV{'form.PreviousStudent'})) {
+        $cache->{'reportSelected'} = 'Student Assessment';
+    }
+    if(defined($ENV{'form.NextStudent'})) {
+        $cache->{'StudentAssessmentMove'} = 'next';
+    } elsif(defined($ENV{'form.PreviousStudent'})) {
+        $cache->{'StudentAssessmentMove'} = 'previous';
+    } else {
+        $cache->{'StudentAssessmentMove'} = 'selected';
+    }
+    &CheckFormElement($cache, 'StudentAssessmentMap', 'StudentAssessmentMap', 
+                      'All Maps');
+    &CheckFormElement($cache, 'StudentAssessmentStudent', 
+                      'StudentAssessmentStudent', 'No Student Selected');
+
+    foreach (keys(%ENV)) {
+        if(/form\.Analyze:::/) {
+#            $cache->{'reportSelected'} = 'Analyze';
+#            $cache->{'reportKey'} = 'Problem Analysis';
+            my ($uri, $title, $part, $problem);
+            (undef, $uri, $title, $part, $problem)=split(':::', $_);
+            $cache->{'AnalyzeURI'}     = $uri;
+            $cache->{'AnalyzeTitle'}   = $title;
+            $cache->{'AnalyzePart'}    = $part;
+            $cache->{'AnalyzeProblem'} = $problem;
+            
+            &CheckFormElement($cache, 'Interval', 'Interval', '1');
+        }
+    }
+
+    return;
+
+    # Select page to display
+    if(defined($ENV{'form.ProblemStatistics'}) ||
+       defined($ENV{'form.ProblemStatisticsRecalculate'}) || 
+       defined($ENV{'form.DisplayCSVFormat'})) {
+        $cache->{'GoToPage'} = 'ProblemStatistics';
+        &CheckFormElement($cache, 'DisplayCSVFormat',
+                          'DisplayFormat', 'Display Table Format');
+        &CheckFormElement($cache, 'Ascend','ProblemStatisticsAscend',
+                          'Ascending');
+        &CheckFormElement($cache, 'Maps', 'ProblemStatisticsMap', 
+                          'All Maps');
+    } elsif(defined($ENV{'form.ProblemAnalysis'})) {
+        $cache->{'GoToPage'} = 'ProblemAnalysis';
+        &CheckFormElement($cache, 'Interval', 'Interval', '1');
+    } elsif(defined($ENV{'form.DoDiffGraph'})) {
+        $cache->{'GoToPage'} = 'DoDiffGraph';
+    } elsif(defined($ENV{'form.PercentWrongGraph'})) {
+        $cache->{'GoToPage'} = 'PercentWrongGraph';
+    } elsif(defined($ENV{'form.ActivityLog'})) {
+        $cache->{'GoToPage'} = 'ActivityLog';
+    } else {
+        $cache->{'GoToPage'} = 'Menu';
+    }
+
+    &CheckFormElement($cache, 'Status', 'Status', 'Active');
 
-sub Title {
-    $r->print('<html><head><title>LON-CAPA Statistics</title></head>');
-    $r->print('<body bgcolor="#FFFFFF">'.
-              '<script>window.focus(); window.width=500;window.height=500;</script>'.
-              '<img align=right src=/adm/lonIcons/lonlogos.gif>');
-# ---------------------------------------------------------------- Course title
-    $r->print('<h1> Course : "'.
-              $ENV{'course.'.$ENV{'request.course.id'}.
-              '.description'}.'"</h1><h2>'.localtime().'</h2>');
-# ------------------------------- This is going to take a while, produce output
-    $r->rflush();	
+    return;
 }
 
+=pod
 
-sub CreateForm {
-    $r->print("\n".'<form name=stat method=post action="/adm/statistics" >');
-    my $content = $ENV{'form.sort'};
-    if (!($ENV{'form.showcsv'}) && 
-        ($content eq '' || $content eq 'Return to Menu')) {
-	my $Ptr = '<h3>';
-	$Ptr .= '<input type=submit name=sort value="Problem Stats"/>';
-	$Ptr .= '<br><br>';
-	$Ptr .= '<input type=submit name=sort value="Problem Analysis"/>';
-	$Ptr .= '<br><br>';
-	$Ptr .= '<input type=submit name=sort value="Student Assessment"/>';
-	$Ptr .= '</h3>';
-	#$Ptr .= '<input type=submit name=sort value="Activity Log"/>';
-	#$Ptr .= '</h3>';
-	$r->print( $Ptr );
+=item &SortStudents()
+
+Determines which students to display and in which order.  Which are 
+displayed are determined by their status(active/expired).  The order
+is determined by the sort button pressed (default to username).  The
+type of sorting is username, lastname, or section.
+
+=over 4
+
+Input: $students, $CacheData
+
+$students: A array pointer to a list of students (username:domain)
+
+$CacheData: A pointer to the hash tied to the cached data
+
+Output: \@order
+
+@order: An ordered list of students (username:domain)
+
+=back
+
+=cut
+
+sub SortStudents {
+    my ($cache)=@_;
+
+    my @students = split(':::',$cache->{'NamesOfStudents'});
+    my @sorted1Students=();
+    foreach (@students) {
+        if($cache->{'Status'} eq 'Any' || 
+           $cache->{$_.':Status'} eq $cache->{'Status'}) {
+            push(@sorted1Students, $_);
+        }
     }
-    else {
-	&ClassList();
-	if ( $content eq 'Student Assessment' || 
-	     $content eq 'Create Student Report' ) {
-	    &MapSecOptions();
-	    &StudentOptions();
-	    &StudentReport($CurStu,$StuBox{"$CurStu"});
-	}
-	elsif ( $content eq 'Problem Analysis' ) {
-	    &AnalyzeProblem();
-	}
-	else {
-	    &MapSecOptions();
-	    &PreStatTable();
-	}
+
+    my $sortBy = '';
+    if(defined($cache->{'sort'})) {
+        $sortBy = ':'.$cache->{'sort'};
     }
+    my @order = sort { $cache->{$a.$sortBy} cmp $cache->{$b.$sortBy} ||
+                       $cache->{$a.':fullname'} cmp $cache->{$b.':fullname'} } 
+                @sorted1Students;
+
+    return \@order;
 }
 
+sub PrepareData {
+    my ($c, $cacheDB)=@_;
 
-sub Menu {
-    &initial();
-#    $Apache::lonxml::debug=1;
-#    &Apache::lonhomework::showhash(%ENV);
-#    $Apache::lonxml::debug=0;
-    &Title();
-    my $InpStr = $ENV{'form.sort'};
-    if ($InpStr eq 'Activity Log') {
-	&Activity();
-    }    
-    elsif ($InpStr=~/^Analyze\_/) {
-	&ClassList();
-	&ShowOpGraph($InpStr,$ENV{'form.interval'});
-    }
-    elsif ( $InpStr eq 'DoDiff Graph' || $InpStr eq '%Wrong Graph' ) {      
-	&GetGraphData($InpStr);
-    	$r->print('<IMG src="/cgi-bin/graph.gif?'.$GData.'" />');
+    # Test for access to the cache data
+    my $courseID=$ENV{'request.course.id'};
+    my $isRecalculate=0;
+    if(defined($ENV{'form.Recalculate'})) {
+        $isRecalculate=1;
     }
-    else {
-	&CreateForm();
-	$r->print("\n".'</form>');
+
+    my $isCached = &Apache::loncoursedata::TestCacheData($cacheDB, 
+                                                         $isRecalculate);
+    if($isCached < 0) {
+        return "Unable to tie hash to db file.";
+    }
+
+    # Download class list information if not using cached data
+    my %cache;
+    unless(tie(%cache,'GDBM_File',$cacheDB,&GDBM_WRCREAT,0640)) {
+        return "Unable to tie hash to db file.";
     }
-    $r->print("\n".'</body>'.
-	      "\n".'</html>');
+
+    if(!$isCached) {
+        my $processTopResourceMapReturn=
+            &Apache::loncoursedata::ProcessTopResourceMap(\%cache, $c);
+        if($processTopResourceMapReturn ne 'OK') {
+            untie(%cache);
+            return $processTopResourceMapReturn;
+        }
+    }
+
+    if($c->aborted()) {
+        untie(%cache);
+        return 'aborted'; 
+    }
+
+    my $classlist=&Apache::loncoursedata::DownloadClasslist($courseID,
+                                                $cache{'ClasslistTimestamp'},
+                                                $c);
+    foreach (keys(%$classlist)) {
+        if(/^(con_lost|error|no_such_host)/i) {
+            untie(%cache);
+            return "Error getting student data.";
+        }
+    }
+
+    if($c->aborted()) {
+        untie(%cache);
+        return 'aborted'; 
+    }
+
+    # Active is a temporary solution, remember to change
+    Apache::loncoursedata::ProcessClasslist(\%cache,$classlist,$courseID,$c);
+    if($c->aborted()) {
+        untie(%cache);
+        return 'aborted'; 
+    }
+
+    &ProcessFormData(\%cache);
+    my $students = &SortStudents(\%cache);
+
+    if($cache{'download'} ne 'false') {
+        my $who = $cache{'download'};
+        my $courseData = 
+            &Apache::loncoursedata::DownloadStudentCourseInformation(
+                                             $who, $courseID, 
+                                             $cache{$who.':lastDownloadTime'});
+        &Apache::loncoursedata::ProcessStudentData(\%cache, $courseData, $who);
+        $cache{'download'} = 'false';
+    } elsif($cache{'DownloadAll'} ne 'false') {
+        my @allStudents;
+        if($cache{'DownloadAll'} eq 'sorted') {
+            @allStudents = @$students;
+        } else {
+            @allStudents = split(':::', $cache{'NamesOfStudents'});
+        }
+        foreach (@allStudents) {
+            my $courseData = 
+                &Apache::loncoursedata::DownloadStudentCourseInformation(
+                                             $_, $courseID, 
+                                             $cache{$_.':lastDownloadTime'});
+            &Apache::loncoursedata::ProcessStudentData(\%cache, $courseData, 
+                                                       $_);
+            if($c->aborted()) {
+                untie(%cache);
+                return 'aborted'; 
+            }
+        }
+        $cache{'DownloadAll'} = 'false';
+    }
+
+    if($c->aborted()) {
+        untie(%cache);
+        return 'aborted'; 
+    }
+
+    if($c->aborted()) {
+        untie(%cache);
+        return 'aborted'; 
+    }
+
+    untie(%cache);
+
+    return ('OK', $students);
+}
+
+# Create progress
+sub Create_PrgWin {
+    $r->print(<<ENDPOP);
+    <script>
+    popwin=open('','popwin','width=400,height=100');
+    popwin.document.writeln('<html><body bgcolor="#88DDFF">'+
+      '<title>LON-CAPA Statistics</title>'+
+      '<h4>Computation Progress</h4>'+
+      '<form name=popremain>'+
+      '<input type=text size=35 name=remaining value=Starting></form>'+
+      '</body></html>');
+    popwin.document.close();
+    </script>
+ENDPOP
+
     $r->rflush();
 }
 
+# update progress
+sub Update_PrgWin {
+    my ($totalStudents,$index,$name)=@_;
+    $r->print('<script>popwin.document.popremain.remaining.value="'.
+              'Computing '.$index.'/'.$totalStudents.': '.
+              $name.'";</script>');
+    $r->rflush();
+}
 
-sub StudentOptions {
-    my $OpSel5='';
-    $CurStu = $ENV{'form.student'};
-    if ( $CurStu eq '' ) { 
-        $CurStu = 'All Students';
-        $OpSel5 = 'selected';
-    }
-    my $Ptr ='';
-# ----------------------------------- Loading the Students Combobox
-    $Ptr .= '<br><b>Select Student</b>'."\n".
-       	    '<select name="student">'."\n". 
-	    '<option '.$OpSel5.'>All Students</option>';                     	     	     
-    foreach my $key ( sort keys %StuBox ) {	          
-	$Ptr .= '<option';
-	if ($CurStu eq $key) {$Ptr .= ' selected';}     
-        $Ptr .= '>'.$key."</option>\n";	     
-    }
-    $Ptr .= '</select>';
-    $Ptr .= '<br><input type="submit" name="sort" value="Create Student Report" />';
-    $r->print( $Ptr );
-    $r->rflush();	
+# close Progress Line
+sub Close_PrgWin {
+    $r->print('<script>popwin.close()</script>');
+    $r->rflush(); 
 }
 
+# For loading the colored table for display or un-colored for print
+sub setbgcolor {
+    my $PrintTable=shift;
+    undef %color;
+    if ($PrintTable){
+	$color{"gb"}="#FFFFFF";
+	$color{"red"}="#FFFFFF";
+	$color{"yellow"}="#FFFFFF";
+	$color{"green"}="#FFFFFF";
+	$color{"purple"}="#FFFFFF";
+    } else {
+	$color{"gb"}="#DDFFFF";
+	$color{"red"}="#FFDDDD";
+	$color{"yellow"}="#EEFFCC";
+	$color{"green"}="#DDFFDD";
+	$color{"purple"}="#FFDDFF";
+    }
 
-sub GetStatus {
-    $OpSel1='';
-    $OpSel2='';
-    $OpSel3='';
-    $OpSel4='';
+    return;
+}
 
-    if ( $ENV{'form.order'} eq 'Descending' ) { $OpSel2='selected'; }
-    else { $OpSel1 = 'selected'; }
+sub initial {
+    undef %hash;
+    undef %CachData;
+    undef %GraphDat;
+    undef %ConceptData;
+    undef $GData;
+}
+
+#---- END HELPER FUNCTIONS ---------------------------------------------------
+
+sub BuildProblemStatisticsPage {
+    my ($cacheDB, $students, $courseID, $c)=@_;
+
+    my %cache;
+    unless(tie(%cache,'GDBM_File',$cacheDB,&GDBM_READER,0640)) {
+        $r->print('<html><body>Unable to tie database.</body></html>');
+        return;
+    }
 
-    my %myHeader = reverse( %Header );
-    $Pos = $myHeader{$ENV{'form.sort'}};
-    if ($Pos == 0) {
-	$OpSel1 = 'selected';
-	$ENV{'form.order'}='Ascendig';
+    my $Ptr = '';
+    $Ptr .= '<table border="0"><tbody>';
+    $Ptr .= '<tr><td align="right"><b>Select Map</b></td>'."\n";
+    $Ptr .= '<td align="left">';
+    $Ptr .= &Apache::lonhtmlcommon::MapOptions(\%cache, 'ProblemStatistics');
+    $Ptr .= '</td></tr>'."\n";
+    $r->print($Ptr);
+    $r->print(&AscendOrderOptions());
+    $r->print(&ProblemStatisticsButtons(\%cache));
+    $r->print('</table>');
+
+    $r->print(&ProblemStatisticsLegend());
+
+    untie(%cache);
+    foreach (@$students) {
+        my $courseData = 
+            &Apache::loncoursedata::DownloadStudentCourseInformation($_, 
+                                                                    $courseID);
+        last if ($c->aborted());
+        if(tie(%cache,'GDBM_File',$cacheDB,&GDBM_WRCREAT,0640)) {
+            &Apache::loncoursedata::ProcessStudentData(\%cache, 
+                                                       $courseData, $_);
+            untie(%cache);
+        }
     }
+    if($c->aborted()) { return; }
 
-    $CurMap = $ENV{'form.maps'};
-    if ( $CurMap eq '' ) { 
-	$CurMap = 'All Maps';
-	$OpSel3 = 'selected';
+    unless(tie(%cache,'GDBM_File',$cacheDB,&GDBM_READER,0640)) {
+        $r->print('<html><body>Unable to tie database.</body></html>');
+        return;
     }
-    $CurSec = $ENV{'form.section'};
-    if ( $CurSec eq '' ) { 
-	$CurSec = 'All Sections';
-        $OpSel4 = 'selected';
+    my $discriminantFactor;
+    my @list=();
+    foreach (@$students) {
+        $discriminantFactor = &ExtractStudentData(\%cache, $_, \@list);
     }
+
+    my ($upper, $lower) = &Discriminant($discriminantFactor);
+    my %Header = (0,"Homework Sets Order",1,"#Stdnts",2,"Tries",3,"Mod",
+                  4,"Mean",5,"#YES",6,"#yes",7,"%Wrng",8,"DoDiff",
+                  9,"S.D.",10,"Skew.",11,"D.F.1st",12,"D.F.2nd", 13, "Disc.");
+    &BuildStatisticsTable(\%cache, $discriminantFactor, \@list, \%Header, 
+                           $students);
+
+    untie(%cache);
+
+    return;
 }
 
+sub BuildDiffGraph {
+    my ($courseID)=@_;
 
-sub MapSecOptions {
-# ----------------------------------- Loading the Maps Combobox
-    my $Ptr = '<br>';
-    $Ptr .= '<input type="submit" name="sort" value="Return to Menu" />';
-    $Ptr .= '<br><b> Select &nbsp; Map &nbsp; &nbsp; </b>'."\n".
-       	    '<select name="maps">'."\n". 
-	    '<option '.$OpSel3.'>All Maps</option>';                     	     	     
-    foreach my $key ( sort keys %maps ) {	          
-	$Ptr .= '<option';
-        if ($CurMap eq $key) {$Ptr .= ' selected';}	     
-	$Ptr .= '>'.$key."</option>\n";	     
+    my $graphData = &GetGraphData('DiffGraph', $courseID);
+    $r->print('<IMG src="/cgi-bin/graph.gif?'.$graphData.'" />');
+
+    return;
+}
+
+sub BuildWrongGraph {
+    my ($courseID)=@_;
+
+    my $graphData = &GetGraphData('WrongGraph', $courseID);
+    $r->print('<IMG src="/cgi-bin/graph.gif?'.$graphData.'" />');
+
+    return;
+}
+
+sub BuildAnalyzePage {
+    my ($cacheDB, $students, $courseID)=@_;
+
+    my %cache;
+    unless(tie(%cache,'GDBM_File',$cacheDB,&GDBM_READER,0640)) {
+        $r->print('<html><body>Unable to tie database.</body></html>');
+        return;
     }
-    $Ptr .= '</select>';
-    $Ptr .= '&nbsp;&nbsp;&nbsp;';
 
-# ----------------------------------- Loading the Sections Combobox
-    $Ptr .= '<br><b>Select Section</b>'."\n".
-       	    '<select name="section">'."\n". 
-	    '<option '.$OpSel4.'>All Sections</option>';                     	     	     
-    foreach my $key ( sort keys %section ) {	          
-	$Ptr .= '<option';
-        if ($CurSec eq $key) {$Ptr .= ' selected';}     
-	$Ptr .= '>'.$key."</option>"."\n";	     
+    &ShowOpGraph(\%cache, $students, $courseID);
+
+    untie(%cache);
+
+    return;
+}
+
+sub BuildProblemAnalysisPage {
+    my ($cacheDB)=@_;
+
+    my %cache;
+    unless(tie(%cache,'GDBM_File',$cacheDB,&GDBM_READER,0640)) {
+        $r->print('<html><body>Unable to tie database.</body></html>');
+        return;
     }
-    $Ptr .= '</select>'."\n";
 
-    $r->print( $Ptr );
-    $r->rflush();
+    $r->print(&IntervalOptions());
+    $r->print(&OptionResponseTable(\%cache));
+
+    untie(%cache);
+
+    return;
 }
 
+sub BuildStudentAssessmentPage {
+    my ($cacheDB, $students, $courseID, $c)=@_;
 
-# ================================================================ Main Handler
+    my %cache;
 
-sub handler {
-    $r=shift;
+    my $Ptr = '';
+    $Ptr .= '<table border="0"><tbody>';
+    $r->print($Ptr);
 
-    if (&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'})) {
-# ------------------------------------------- Set document type for header only
-	if ($r->header_only) {
-	    if ($ENV{'browser.mathml'}) {
-		$r->content_type('text/xml');
-	    } 
-	    else {
-		$r->content_type('text/html');
-	    }
-	    $r->send_http_header;
-	    return OK;
-	}    
-	my $requrl=$r->uri;
-# ----------------------------------------------------------------- Tie db file
+    unless(tie(%cache,'GDBM_File',$cacheDB,&GDBM_READER,0640)) {
+        $r->print('<html><body>Unable to tie database.</body></html>');
+        return;
+    }
+
+    my $selectedName = $cache{'StudentAssessmentStudent'};
+    for(my $index=0; 
+        ($selectedName ne 'All Students') && ($index<(scalar @$students)); 
+        $index++) {
+        my $fullname = $cache{$students->[$index].':fullname'};
+        if($fullname eq $selectedName) {
+            if($cache{'StudentAssessmentMove'} eq 'next') {
+                if($index == ((scalar @$students) - 1)) {
+                    $selectedName = $students->[0];
+                } else {
+                    $selectedName = $students->[$index+1];
+                }
+            } elsif($cache{'StudentAssessmentMove'} eq 'previous') {
+                if($index == 0) {
+                    $selectedName = $students->[-1];
+                } else {
+                    $selectedName = $students->[$index-1];
+                }
+            } else {
+                $selectedName = $students->[$index];
+            }
+            last;
+        }
+    }
 
-	undef %hash;
+    $Ptr .= '<tr><td align="right"><b>Select Map</b></td>'."\n";
+    $Ptr .= '<td align="left">';
+    $Ptr .= &Apache::lonhtmlcommon::MapOptions(\%cache, 'StudentAssessment');
+    $Ptr .= '</td></tr>'."\n";
+    $Ptr .= '<tr><td align="right"><b>Select Student</b></td>'."\n";
+    $Ptr .= '<td align="left">'."\n";
+    $Ptr .= &Apache::lonhtmlcommon::StudentOptions(\%cache, $students, 
+                                                   $selectedName, 
+                                                   'StudentAssessment');
+    $Ptr .= '</td></tr>'."\n";
+    untie(%cache);
+
+    $Ptr .= '<tr><td></td><td align="left">';
+    $Ptr .= '<input type="submit" name="CreateStudentAssessment" ';
+    $Ptr .= 'value="Create Student Report" />';
+    $Ptr .= '&nbsp&nbsp&nbsp';
+    $Ptr .= '<input type="submit" name="PreviousStudent" ';
+    $Ptr .= 'value="Previous Student" />';
+    $Ptr .= '&nbsp&nbsp&nbsp';
+    $Ptr .= '<input type="submit" name="NextStudent" ';
+    $Ptr .= 'value="Next Student" />';
+    $Ptr .= '&nbsp&nbsp&nbsp';
+    $Ptr .= '</td></tr></tbody></table>'."\n";
+    $r->print($Ptr);
 
-	if ($ENV{'request.course.fn'}) {
-	    my $fn=$ENV{'request.course.fn'};
-	    if (-e "$fn.db") {
-		if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER,0640)) {
-# ------------------------------------------------------------------- Hash tied
-		    $r->content_type('text/html');
-		    $r->send_http_header;
-		    &Menu();
-		}
-		else {
-		    $r->content_type('text/html');
-		    $r->send_http_header;
-		    $r->print('<html><body>Coursemap undefined.</body></html>');
-		}
-# ------------------------------------------------------------------ Untie hash
-		unless (untie(%hash)) {
-		    &Apache::lonnet::logthis("<font color=blue>WARNING: ".
-                            "Could not untie coursemap $fn (browse).</font>"); 
-		}
+    if($selectedName eq 'No Student Selected') {
+	$r->print('<h3><font color=blue>WARNING: ');
+        $r->print('Please select a student</font></h3>');
+        return;
+    }
+
+    my $selected=0;
+    foreach (@$students) {
+        next if ($_ ne $selectedName && 
+                 $selectedName ne 'All Students');
+        $selected = 1;
+        my $courseData = 
+            &Apache::loncoursedata::DownloadStudentCourseInformation($_, 
+                                                                    $courseID);
+        last if ($c->aborted());
+        if(tie(%cache,'GDBM_File',$cacheDB,&GDBM_WRCREAT,0640)) {
+            &Apache::loncoursedata::ProcessStudentData(\%cache, 
+                                                       $courseData, $_);
+            if(!$c->aborted()) { $r->print(&StudentReport(\%cache, $_)); }
+            untie(%cache);
+        }
+    }
+    if($selected == 0) {
+	$r->print('<h3><font color=blue>WARNING: ');
+        $r->print('Please select a student</font></h3>');
+        return;
+    }
+
+    return;
+}
+
+sub BuildClasslist {
+    my ($cacheDB,$students,$studentInformation,$headings,$spacePadding)=@_;
+
+    my %cache;
+    unless(tie(%cache,'GDBM_File',$cacheDB,&GDBM_READER,0640)) {
+        return '<html><body>Unable to tie database.</body></html>';
+    }
+
+    my $Str='';
+    $Str .= '<table border="0"><tr><td bgcolor="#777777">'."\n";
+    $Str .= '<table border="0" cellpadding="3"><tr bgcolor="#e6ffff">'."\n";
+
+    my $displayString = '<td align="left"><a href="/adm/statistics?';
+    $displayString .= 'sort=LINKDATA">DISPLAYDATA&nbsp</a></td>'."\n";
+    $Str .= &Apache::lonhtmlcommon::CreateStudentInformationHeadings(\%cache,
+                                                           $studentInformation,
+                                                           $headings,
+                                                           $displayString);
+    $Str .= '<td align="left">';
+    $Str .= '<a href="/adm/statistics?sort=lastDownloadTime">';
+    $Str .= 'Last Updated&nbsp&nbsp</a></td>'."\n";
+    $Str .= '</tr>'."\n";
+    my $alternate=0;
+    foreach (@$students) {
+        my ($username, $domain) = split(':', $_);
+        if($alternate) {
+            $Str .= '<tr bgcolor="#ffffe6"><td>';
+        } else {
+            $Str .= '<tr bgcolor="#ffffc6"><td>';
+        }
+        $alternate = ($alternate + 1) % 2;
+        foreach my $data (@$studentInformation) {
+            if($data eq 'fullname') {
+                $Str .= '<a href="/adm/statistics?reportSelected=';
+                $Str .= &Apache::lonnet::escape('Student Assessment').'">';
+            }
 
-# -------------------------------------------------------------------- All done
-		return OK;
-# ----------------------------------------------- Errors, hash could no be tied
-	    }
-	} 
-	else {
-	    $ENV{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
-	    return HTTP_NOT_ACCEPTABLE; 
-	}
+            $Str .= $cache{$_.':'.$data}.'&nbsp';
+
+            if($data eq 'fullname') {
+                $Str .= '</a>';
+            }
+
+            $Str .= '</td><td>';
+        }
+
+        $Str .= '<a href="/adm/statistics?download='.$_.'">';
+        my $downloadTime = $cache{$_.':lastDownloadTime'};
+        if($downloadTime ne 'Not downloaded') {
+            $downloadTime = localtime($downloadTime);
+        }
+        $Str .= $downloadTime;
+
+        $Str .= '&nbsp</a></td></tr>'."\n";
     }
-    else {
+
+    $Str .= '</table></td></tr></table>'."\n";
+
+    untie(%cache);
+
+    return $Str;
+}
+
+sub BuildStatistics {
+    my ($r)=@_;
+
+    my $c = $r->connection;
+    my @studentInformation=('fullname','section','id','domain','username');
+    my @headings=('Full Name', 'Section', 'PID', 'Domain', 'User Name');
+    my $spacePadding = '   ';
+    my %reports = ('classlist'          => 'Class list',
+                   'problem_statistics' => 'Problem Statistics',
+                   'student_assessment' => 'Student Assessment',
+                   'reportSelected'     => 'Class list');
+
+    my %cache;
+    my $courseID=$ENV{'request.course.id'};
+    my $cacheDB = "/home/httpd/perl/tmp/$ENV{'user.name'}".
+                  "_$ENV{'user.domain'}_$courseID\_statistics.db";
+
+    &setbgcolor(0);
+    my ($returnValue, $students) = &PrepareData($c, $cacheDB);
+    if($returnValue ne 'OK') {
+        $r->print('<html><body>'.$returnValue."\n".'</body></html>');
+        return OK;
+    }
+
+    my $GoToPage;
+    if(tie(%cache,'GDBM_File',$cacheDB,&GDBM_READER,0640)) {
+        $GoToPage = $cache{'reportSelected'};
+        $reports{'reportSelected'} = $cache{'reportSelected'};
+#        if(defined($cache{'reportKey'}) && $cache{'reportKey'} ne 'false') {
+#            $reports{$cache{'reportKey'}} = $cache{'reportSelected'};
+#        }
+
+        if(defined($cache{'OptionResponses'})) {
+            $reports{'problem_analysis'} = 'Problem Analysis';
+        }
+
+        $r->print(&Apache::lonhtmlcommon::Title('LON-CAPA Statistics'));
+        $r->print('<form name="Statistics" ');
+        $r->print('method="post" action="/adm/statistics">');
+        $r->print(&Apache::lonhtmlcommon::CreateStatisticsMainMenu(
+                                                             $cache{'Status'}, 
+                                                             \%reports));
+        untie(%cache);
+    } else {
+        $r->print('<html><body>Unable to tie database.</body></html>');
+        return OK;
+    }
+
+    if($GoToPage eq 'Activity Log') {
+        &Activity();
+    } elsif($GoToPage eq 'Problem Statistics') {
+        &BuildProblemStatisticsPage($cacheDB, $students, $courseID, $c);
+    } elsif($GoToPage eq 'Problem Analysis') {
+        &BuildProblemAnalysisPage($cacheDB);
+    } elsif($GoToPage eq 'Student Assessment') {
+        &BuildStudentAssessmentPage($cacheDB, $students, $courseID, $c);
+    } elsif($GoToPage eq 'Analyze') {
+        &BuildAnalyzePage($cacheDB, $students, $courseID);
+    } elsif($GoToPage eq 'DoDiffGraph') {
+        &BuildDiffGraph($courseID);
+    } elsif($GoToPage eq 'PercentWrongGraph') {
+        &BuildWrongGraph($courseID);
+    } elsif($GoToPage eq 'Class list') {
+        $r->print(&BuildClasslist($cacheDB, $students, \@studentInformation,
+                                  \@headings, $spacePadding));
+    }
+
+    $r->print('</form>'."\n");
+    $r->print("\n".'</body>'."\n".'</html>');
+    $r->rflush();
+
+    return OK;
+}
+
+# ================================================================ Main Handler
+
+sub handler {
+    $r=shift;
+    &initial();
+
+    unless(&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'})) {
         $ENV{'user.error.msg'}=
         $r->uri.":vgr:0:0:Cannot view grades for complete course";
+        return HTTP_NOT_ACCEPTABLE; 
+    }
 
+    # Set document type for header only
+    if($r->header_only) {
+        if ($ENV{'browser.mathml'}) {
+            $r->content_type('text/xml');
+        } else {
+            $r->content_type('text/html');
+        }
+        &Apache::loncommon::no_cache($r);
+        $r->send_http_header;
+        return OK;
+    }
+
+    unless($ENV{'request.course.fn'}) {
+	my $requrl=$r->uri;
+        $ENV{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
         return HTTP_NOT_ACCEPTABLE; 
     }
+
+    $r->content_type('text/html');
+    $r->send_http_header;
+
+    &BuildStatistics($r);
+
+    return OK;
 }
 1;
 __END__