--- loncom/interface/statistics/lonproblemstatistics.pm	2003/06/02 13:58:43	1.51
+++ 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 1.51 2003/06/02 13:58:43 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' },
 );
 
 ###############################################
@@ -202,6 +204,10 @@ sub CreateInterface {
     $Str .= &CreateAndParseOutputSelector();
     $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;
 }
 
@@ -362,14 +368,6 @@ sub BuildProblemStatisticsPage {
               '" />');
     $r->print('<input type="hidden" name="plot" value="" />');
     if (! exists($ENV{'form.statsfirstcall'})) {
-        $r->print(<<ENDMSG);
-<p>
-<font size="+1">
-Please make your selections in the boxes above and hit 
-the button marked &quot;Update&nbsp;Display&quot;.
-</font>
-</p>
-ENDMSG
         return;
     }
     #
@@ -649,7 +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'});
@@ -714,8 +724,7 @@ sub statistics_html_table_data {
             }
         $row .= '>';
         if (exists($field->{'special'}) && $field->{'special'} eq 'link') {
-            $row .= '<a href="'.$data->{$field->{'name'}.'.link'}.
-                ' target="_blank">';
+            $row .= '<a href="'.$data->{$field->{'name'}.'.link'}.'">';
         }
         if (exists($field->{'format'})) {
             $row .= sprintf($field->{'format'},$data->{$field->{'name'}});
@@ -786,7 +795,6 @@ sub plot_statistics {
         }
     }
     return if (! defined($sortfield) || $sortfield eq '');
-    &Apache::lonnet::logthis('data field = '.$datafield);
     #
     my $Max = 0;
     my $problem_num = 0;
@@ -890,7 +898,8 @@ sub get_statistics {
     $data->{'problem_num'} = $problem_num;
     $data->{'container'}   = $sequence->{'title'};
     $data->{'title'}       = $resource->{'title'};
-    $data->{'title.link'}  = $resource->{'src'};
+    $data->{'title.link'}  = $resource->{'src'}.'?symb='.
+        &Apache::lonnet::escape($resource->{'symb'});
     #
     return $data;
 }