--- loncom/interface/statistics/lonproblemstatistics.pm	2003/06/13 20:27:17	1.53
+++ loncom/interface/statistics/lonproblemstatistics.pm	2003/08/27 21:33:33	1.56
@@ -1,6 +1,6 @@
 # The LearningOnline Network with CAPA
 #
-# $Id: lonproblemstatistics.pm,v 1.53 2003/06/13 20:27:17 matthew Exp $
+# $Id: lonproblemstatistics.pm,v 1.56 2003/08/27 21:33:33 matthew Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -75,7 +75,8 @@ my @Fields = (
            { name   => 'part', 
              title  => 'Part',
              align  => 'left',
-             color  => '#FFFFE6' },
+             color  => '#FFFFE6',
+             },
            { name   => 'num_students',
              title  => '#Stdnts',
              align  => 'right',
@@ -131,7 +132,8 @@ my @Fields = (
              format => '%5.2f',
              sortable  => 'yes',
              graphable => 'yes',
-             long_title => 'Degree of Difficulty' },
+             long_title => 'Degree of Difficulty'.
+                           '[ 1 - ((#YES+#yes) / Tries) ]'},
            { name   => 'num_solved',
              title  => '#YES',
              align  => 'right',
@@ -155,7 +157,7 @@ my @Fields = (
              format => '%4.1f',
              sortable  => 'yes',
              graphable => 'yes',
-             long_title => 'Percent Wrong' },
+             long_title => 'Percent of students whose final answer is wrong' },
 );
 
 ###############################################
@@ -203,6 +205,9 @@ sub CreateInterface {
     $Str .= '</td></tr>'."\n";
     $Str .= '</table>'."\n";
     $Str .= '<input type="submit" value="Generate Statistics" />';
+    $Str .= '&nbsp;'x5;
+    $Str .= '<input type="submit" name="ClearCache" value="Clear Caches" />';
+    $Str .= '&nbsp;'x5;
     return $Str;
 }
 
@@ -305,44 +310,6 @@ sub CreateAndParseOutputSelector {
 
 =pod 
 
-=item &Gather_Student_Data()
-
-Ensures all student data is up to date.
-
-=cut
-
-###############################################
-###############################################
-sub Gather_Student_Data {
-    my ($r) = @_;
-    my $c = $r->connection();
-    #
-    my @Sequences = &Apache::lonstatistics::Sequences_with_Assess();
-    #
-    my @Students = @Apache::lonstatistics::Students;
-    #
-    # Open the progress window
-    my %prog_state=&Apache::lonhtmlcommon::Create_PrgWin
-        ($r,'Statistics Compilation Status',
-         'Statistics Compilation Progress', scalar(@Students));
-    #
-    while (my $student = shift @Students) {
-        return if ($c->aborted());
-        my ($status,undef) = &Apache::loncoursedata::ensure_current_data
-            ($student->{'username'},$student->{'domain'},
-             $ENV{'request.course.id'});
-        &Apache::lonhtmlcommon::Increment_PrgWin($r,\%prog_state,
-                                                 'last student');
-    }
-    &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
-    $r->rflush();
-}
-
-###############################################
-###############################################
-
-=pod 
-
 =item &BuildProblemStatisticsPage()
 
 Main interface to problem statistics.
@@ -366,7 +333,7 @@ sub BuildProblemStatisticsPage {
         return;
     }
     #
-    &Gather_Student_Data($r);
+    &Apache::lonstatistics::Gather_Student_Data($r);
     #
     #
     if ($output_mode eq 'html') {
@@ -642,7 +609,19 @@ sub output_excel {
     $rows_output++; 
     $cols_output=0;
     #
-    # Add the headers
+    # Long Headersheaders
+    foreach my $field (@Fields) {
+        next if ($field->{'name'} eq 'problem_num');
+        if (exists($field->{'long_title'})) {
+            $excel_sheet->write($rows_output,$cols_output++,
+                                $field->{'long_title'});
+        } else {
+            $excel_sheet->write($rows_output,$cols_output++,'');
+        }
+    }
+    $rows_output++;
+    $cols_output=0;
+    # Brief headers
     foreach my $field (@Fields) {
         next if ($field->{'name'} eq 'problem_num');
         $excel_sheet->write($rows_output,$cols_output++,$field->{'title'});