--- loncom/interface/statistics/lonproblemstatistics.pm	2003/06/13 20:27:17	1.53
+++ loncom/interface/statistics/lonproblemstatistics.pm	2003/07/28 15:30:46	1.55
@@ -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 1.55 2003/07/28 15:30:46 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;
 }
 
@@ -642,7 +647,19 @@ 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'});