--- loncom/interface/statistics/lonproblemstatistics.pm	2005/04/07 06:56:24	1.104
+++ loncom/interface/statistics/lonproblemstatistics.pm	2006/08/18 15:15:38	1.110
@@ -1,6 +1,6 @@
 # The LearningOnline Network with CAPA
 #
-# $Id: lonproblemstatistics.pm,v 1.104 2005/04/07 06:56:24 albertel Exp $
+# $Id: lonproblemstatistics.pm,v 1.110 2006/08/18 15:15:38 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -60,6 +60,9 @@ use Apache::lonlocal;
 use Spreadsheet::WriteExcel;
 use Apache::lonstathelpers();
 use Time::HiRes;
+use lib '/home/httpd/lib/perl/';
+use LONCAPA;
+ 
 
 my @StatsArray;
 my %SeqStat;    # keys are symbs, values are hash refs
@@ -608,12 +611,13 @@ sub CreateInterface {
     &parse_field_selection();
     #
     my $Str = '';
-    $Str .= &Apache::lonhtmlcommon::breadcrumbs
-        (undef,'Overall Problem Statistics','Statistics_Overall_Key');
+    $Str .= &Apache::lonhtmlcommon::breadcrumbs('Overall Problem Statistics',
+						'Statistics_Overall_Key');
     $Str .= '<table cellspacing="5">'."\n";
     $Str .= '<tr>';
     $Str .= '<td align="center"><b>'.&mt('Sections').'</b></td>';
-    $Str .= '<td align="center"><b>'.&mt('Enrollment Status').'</b></td>';
+    $Str .= '<td align="center"><b>'.&mt('Groups').'</b></td>';
+    $Str .= '<td align="center"><b>'.&mt('Access Status').'</b></td>';
     $Str .= '<td align="center"><b>'.&mt('Sequences and Folders').'</b></td>';
     $Str .= '<td align="center"><b>'.&mt('Statistics').'</b></td>';
     $Str .= '<td rowspan="2">'.
@@ -623,6 +627,8 @@ sub CreateInterface {
     $Str .= '<tr><td align="center">'."\n";
     $Str .= &Apache::lonstatistics::SectionSelect('Section','multiple',5);
     $Str .= '</td><td align="center">';
+    $Str .= &Apache::lonstatistics::GroupSelect('Group','multiple',5);
+    $Str .= '</td><td align="center">';
     $Str .= &Apache::lonhtmlcommon::StatusOptions(undef,undef,5);
     $Str .= '</td><td align="center">';
     #
@@ -661,6 +667,11 @@ Main interface to problem statistics.
 my $navmap;
 my @sequences;
 
+sub clean_up {
+    undef($navmap);
+    undef(@sequences);
+}
+
 sub BuildProblemStatisticsPage {
     my ($r,$c)=@_;
     undef($navmap);
@@ -669,6 +680,7 @@ sub BuildProblemStatisticsPage {
     my %Saveable_Parameters = ('Status' => 'scalar',
                                'statsoutputmode' => 'scalar',
                                'Section' => 'array',
+                               'Groups' => 'array',
                                'StudentData' => 'array',
                                'Maps' => 'array',
                                'fieldselections'=> 'array');
@@ -705,6 +717,7 @@ sub BuildProblemStatisticsPage {
                       'for the first analysis.  Future analysis this session '.
                       ' will not have this delay.').
                   '</p>');
+	&clean_up();
         return;
     }
     $r->rflush();
@@ -718,6 +731,7 @@ sub BuildProblemStatisticsPage {
     if (! ref($navmap)) {
         $r->print('<h1>'.&mt('A course-wide error occured.').'</h1>'.
                   '<h3>'.$navmap.'</h3>');
+	&clean_up();
         return;
     }
     if (exists($env{'form.Excel'})) {
@@ -765,6 +779,7 @@ sub BuildProblemStatisticsPage {
             &output_sequence_statistics($r);
         }
     }
+    &clean_up();
     return;
 }
 
@@ -1302,6 +1317,7 @@ sub Excel_output {
                         &Apache::lonstatistics::section_and_enrollment_description('plaintext'),
                         $format->{'h3'});
     $cols_output += scalar(&Apache::lonstatistics::get_selected_sections());
+    $cols_output += scalar(&Apache::lonstatistics::get_selected_groups());
     #
     # Time restrictions
     my $time_string;
@@ -1543,6 +1559,7 @@ sub get_statistics {
     #
     my $data = &Apache::loncoursedata::get_problem_statistics
                         ([&Apache::lonstatistics::get_selected_sections()],
+                         [&Apache::lonstatistics::get_selected_groups()],
                          $Apache::lonstatistics::enrollment_status,
                          $symb,$part,$courseid,$starttime,$endtime);
     $data->{'symb'}        = $symb;
@@ -1551,7 +1568,7 @@ sub get_statistics {
     $data->{'container'}   = $sequence->compTitle;
     $data->{'title'}       = $resource->compTitle;
     $data->{'title.link'}  = $resource->src.'?symb='.
-        &Apache::lonnet::escape($resource->symb);
+        &escape($resource->symb);
     #
     if ($SelectedFields{'deg_of_disc'}) {
         $data->{'deg_of_disc'} = 
@@ -1621,8 +1638,9 @@ sub compute_discrimination_factor {
         &Apache::loncoursedata::rank_students_by_scores_on_resources
         (\@Resources,
          [&Apache::lonstatistics::get_selected_sections()],
+         [&Apache::lonstatistics::get_selected_groups()],
          $Apache::lonstatistics::enrollment_status,undef,
-         $starttime,$endtime);
+         $starttime,$endtime, $symb);
     #
     # compute their percent scores on the problems in the sequence,
     my $number_to_grab = int(scalar(@{$ranking})/4);
@@ -1632,7 +1650,7 @@ sub compute_discrimination_factor {
     my @TopSet    = 
         map { 
             $_->[&Apache::loncoursedata::RNK_student()]; 
-          } @{$ranking}[($num_students-$number_to_grab)..($num_students-1)];
+          } @{$ranking}[-$number_to_grab..0];
     if (! @BottomSet || (@BottomSet == 1 && $BottomSet[0] eq '') ||
         ! @TopSet    || (@TopSet    == 1 && $TopSet[0]    eq '')) {
         return 'nan';
@@ -1686,6 +1704,7 @@ sub compute_sequence_statistics {
     my ($smin,$smax,$sMean,$sSTD,$scount,$sMAX) = 
         &Apache::loncoursedata::score_stats
                     ([&Apache::lonstatistics::get_selected_sections()],
+                     [&Apache::lonstatistics::get_selected_groups()],
                      $Apache::lonstatistics::enrollment_status,
                      \@Resources,$starttime,$endtime,undef);
     $SeqStat{$symb}->{'title'}  = $seq->compTitle;
@@ -1701,6 +1720,7 @@ sub compute_sequence_statistics {
     my ($cmin,$cmax,$cMean,$cSTD,$ccount)=
         &Apache::loncoursedata::count_stats
         ([&Apache::lonstatistics::get_selected_sections()],
+         [&Apache::lonstatistics::get_selected_groups()],
          $Apache::lonstatistics::enrollment_status,
          \@Resources,$starttime,$endtime,undef);
     my $K = $part_count;