--- loncom/interface/statistics/lonproblemanalysis.pm	2004/04/01 15:32:06	1.84
+++ loncom/interface/statistics/lonproblemanalysis.pm	2004/10/15 16:50:30	1.94
@@ -1,6 +1,6 @@
 # The LearningOnline Network with CAPA
 #
-# $Id: lonproblemanalysis.pm,v 1.84 2004/04/01 15:32:06 albertel Exp $
+# $Id: lonproblemanalysis.pm,v 1.94 2004/10/15 16:50:30 matthew Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -51,23 +51,17 @@ my @SubmitButtons = ({ name => 'PrevProb
                      { name => 'NextProblemAnalysis',
                        text => 'Next Problem' },
                      { name => 'break'},
-                     { name => 'ClearCache',
-                       text => 'Clear Caches' },
-                     { name => 'updatecaches',
-                       text => 'Update Student Data' },
                      { name => 'SelectAnother',
                        text => 'Choose a different Problem' },
                      { name => 'ExcelOutput',
                        text => 'Produce Excel Output' });
 
-
 sub BuildProblemAnalysisPage {
     my ($r,$c)=@_;
     #
     my %Saveable_Parameters = ('Status' => 'scalar',
                                'Section' => 'array',
                                'NumPlots' => 'scalar',
-                               'AnalyzeAs' => 'scalar',
                                'AnalyzeOver' => 'scalar',
                                );
     &Apache::loncommon::store_course_settings('problem_analysis',
@@ -81,25 +75,18 @@ sub BuildProblemAnalysisPage {
     #
     my @Students = @Apache::lonstatistics::Students;
     #
-    if (@Students < 1) {
+    if (@Students < 1 && exists($ENV{'form.firstrun'})) {
         $r->print('<h2>There are no students in the sections selected</h2>');
     }
     #
-    &Apache::loncoursedata::clear_internal_caches();
-    if (exists($ENV{'form.ClearCache'}) || 
-        exists($ENV{'form.updatecaches'}) ||
-        (exists($ENV{'form.firstanalysis'}) &&
-         $ENV{'form.firstanalysis'} ne 'no')) {
-        &Apache::lonstatistics::Gather_Full_Student_Data($r);
-    }
-    if (! exists($ENV{'form.firstanalysis'})) {
-        $r->print('<input type="hidden" name="firstanalysis" value="yes" />');
-    } else {
-        $r->print('<input type="hidden" name="firstanalysis" value="no" />');
-    }
+    my @CacheButtonHTML = 
+        &Apache::lonstathelpers::manage_caches($r,'Statistics','stats_status');
     $r->rflush();
     #
-    my $problem_types = '(option|radiobutton|numerical)';
+    # Support for numerical and radio response isn't complete enough to
+    # include in 1.2 release.
+    # my $problem_types = '(option|radiobutton|numerical)';
+    my $problem_types = '.';#(option)';
     if (exists($ENV{'form.problemchoice'}) && 
         ! exists($ENV{'form.SelectAnother'})) {
         foreach my $button (@SubmitButtons) {
@@ -111,6 +98,9 @@ sub BuildProblemAnalysisPage {
                 $r->print('&nbsp;'x5);
             }
         }
+        foreach my $html (@CacheButtonHTML) {
+            $r->print($html.('&nbsp;'x5));
+        }
         #
         $r->print('<hr />');
         $r->rflush();
@@ -144,20 +134,22 @@ sub BuildProblemAnalysisPage {
             my $resource = $current_problem->{'resource'};
             $r->print('<h1>'.$resource->{'title'}.'</h1>');
             $r->print('<h3>'.$resource->{'src'}.'</h3>');
-            $r->print(&Apache::lonstathelpers::render_resource($resource));
+            if ($ENV{'form.show_prob'} eq 'true') {
+                $r->print(&Apache::lonstathelpers::render_resource($resource));
+            }
             $r->rflush();
             my %Data = &Apache::lonstathelpers::get_problem_data
                 ($resource->{'src'});
-            my $ProblemData = $Data{$current_problem->{'part'}.
+            my $problem_data = $Data{$current_problem->{'part'}.
                                     '.'.
                                     $current_problem->{'respid'}};
             if ($current_problem->{'resptype'} eq 'option') {
                 &OptionResponseAnalysis($r,$current_problem,
-                                        $ProblemData,
+                                        $problem_data,
                                         \@Students);
             } elsif ($current_problem->{'resptype'} eq 'radiobutton') {
                 &RadioResponseAnalysis($r,$current_problem,
-                                       $ProblemData,
+                                       $problem_data,
                                        \@Students);
             } elsif ($current_problem->{'resptype'} eq 'numerical') {
                 ## 
@@ -168,7 +160,7 @@ sub BuildProblemAnalysisPage {
                     foreach my $respid (@{$res->{'partdata'}->{$partid}->{'ResponseIds'}}) {
                         $current_problem->{'respid'}=$respid;
                         &NumericalResponseAnalysis($r,$current_problem,
-                                                   $ProblemData,\@Students);
+                                                   $problem_data,\@Students);
                     }
                 }
             } else {
@@ -195,7 +187,7 @@ sub BuildProblemAnalysisPage {
 #########################################################
 #########################################################
 sub NumericalResponseAnalysis {
-    my ($r,$problem,$ProblemData,$Students) = @_;
+    my ($r,$problem,$problem_data,$Students) = @_;
     my $c = $r->connection();
     my ($resource,$partid,$respid) = ($problem->{'resource'},
                                       $problem->{'part'},
@@ -230,8 +222,9 @@ sub NumericalResponseAnalysis {
     }
     #
     # This next call causes all the waiting around that people complain about
-    my ($max,$min) = &Apache::lonstathelpers::GetStudentAnswers($r,$problem,
-                                                                $Students);
+    &Apache::lonstathelpers::GetStudentAnswers($r,$problem,$Students,
+                                               'Statistics',
+                                               'stats_status');
     return if ($c->aborted());
     #
     # Collate the data
@@ -383,69 +376,395 @@ sub build_student_data_worksheet {
 #########################################################
 #########################################################
 sub RadioResponseAnalysis {
-    my ($r,$problem,$ProblemData,$Students) = @_;
-    my ($resource,$respid) = ($problem->{'resource'},
-                              $problem->{'respid'});
+    my ($r,$problem,$problem_analysis,$students) = @_;
+    if ($ENV{'form.AnalyzeOver'} eq 'tries') {
+        &RR_tries_analysis($r,$problem,$problem_analysis,$students);
+    } elsif ($ENV{'form.AnalyzeOver'} eq 'time') {
+        &RR_static_time_analysis($r,$problem,$problem_analysis,$students);
+    } else {
+        $r->print('Bad request');
+    }
+    return;
+}
+
+sub RR_computed_tries_analysis {
+    my ($r,$problem,$problem_analysis) = @_;
+    my ($resource,$partid,$respid) = ($problem->{'resource'},
+                                      $problem->{'part'},
+                                      $problem->{'respid'});
+    $r->print('The tries answer you seek must be computed');
+    # Gather student data
+    # for each try
+    #    loop through data, classifying it by
+    #         correct foil -> selected foil
+    #    if there is concept data
+    #         make a concept correct plot
+    #    for each correct foil
+    #         make a plot of the data
+}
+
+sub RR_computed_time_analysis {
+    my ($r,$problem,$problem_analysis) = @_;
+    my ($resource,$partid,$respid) = ($problem->{'resource'},
+                                      $problem->{'part'},
+                                      $problem->{'respid'});
+    $r->print('The time answer you seek must be computed');
+    # Gather student data
+    # for time division
+    #    limit to between start time & end time
+    #    loop through data, classifying it by
+    #         correct foil -> selected foil
+    #    if there is concept data
+    #         make a concept correct plot
+    #    for each correct foil
+    #         make a plot of the data
+}
+
+sub RR_tries_analysis {
+    my ($r,$problem,$problem_analysis,$students) = @_;
+    my ($resource,$partid,$respid) = ($problem->{'resource'},
+                                      $problem->{'part'},
+                                      $problem->{'respid'});
+    #
     my $analysis_html;
-    my $PerformanceData = &Apache::loncoursedata::get_response_data
+    my $foildata = $problem_analysis->{'_Foils'};
+    my ($table,$foils,$concepts) = &build_foil_index($problem_analysis);
+    $analysis_html .= $table;
+    # Gather student data
+    my $response_data = &Apache::loncoursedata::get_response_data
         (\@Apache::lonstatistics::SelectedSections,
          $Apache::lonstatistics::enrollment_status,
          $resource->{'symb'},$respid);
-    if (! defined($PerformanceData) || 
-        ref($PerformanceData) ne 'ARRAY' ) {
+    my $correct;   # either a hash reference or a scalar
+    if ($problem_analysis->{'answercomputed'} || scalar(@$concepts) > 1) {
+        # This takes a while for large classes...
+        &Apache::lonstathelpers::GetStudentAnswers($r,$problem,$students,
+                                                   'Statistics',
+                                                   'stats_status');
+        foreach my $student (@$students) {
+            my ($idx,@remainder) = split('&',$student->{'answer'});
+            my ($answer) = ($remainder[$idx]=~/^(.*)=([^=]*)$/);
+            $correct->{$student->{'username'}.':'.$student->{'domain'}}=
+                &Apache::lonnet::unescape($answer);
+        }
+    } else {
+        foreach my $foil (keys(%$foildata)) {
+            if ($foildata->{$foil}->{'value'} eq 'true') {
+                $correct = $foildata->{$foil}->{'name'};
+                last;
+            }
+        }
+    }
+    if (! defined($response_data) || 
+        ref($response_data) ne 'ARRAY' ) {
+        $analysis_html = '<h2>'.
+            &mt('There is no submission data for this resource').
+            '</h2>';
+        $r->print($analysis_html);
+        return;
+    }
+    #
+    $analysis_html.='<table>';
+    for (my $try = 1;$try<=$ENV{'form.NumPlots'};$try++) {
+        # classify data ->correct foil -> selected foil
+        my $attempt_restriction_function = 
+        my $foil_choice_data = 
+            &RR_classify_response_data($response_data,$correct,
+                                       sub {($_[0]->{'tries'} == $try?1:0)});
+        my $answers;
+        if (ref($correct)) {
+            my %tmp;
+            foreach my $foil (values(%$correct)) {
+                $tmp{$foil}++;
+            }
+            $answers = [keys(%tmp)];
+        } else {
+            $answers = [$correct];
+        }
+        # Concept Plot
+        my $concept_plot = '';
+        if (scalar(@$concepts) > 1) {
+            $concept_plot = &RR_concept_plot($concepts,$foil_choice_data,
+                                             '% choosing');
+        }
+        # % Choosing plot
+        my $choice_plot = &RR_create_percent_selected_plot
+            ($foils,$foil_choice_data,'Attempt '.$try);
+        # for each correct foil, how did they mark it? (stacked bar graph)
+        my ($stacked_plot,$count_by_foil) = 
+            &RR_create_stacked_selection_plot($foils,$foil_choice_data,'');
+        #
+        if ($concept_plot ne '' ||
+            $choice_plot ne '' ||
+            $stacked_plot ne '') {
+            $analysis_html.=
+                '<tr>'.
+                '<td>'.$concept_plot.'</td>'.
+                '<td>'.$choice_plot.'</td>';
+            if ($stacked_plot ne '') {
+                $analysis_html .= 
+                '<td>'.$stacked_plot.'</td>'.
+                '<td>'.&build_foil_key($foils,$count_by_foil).'</td>';
+            } else {
+                $analysis_html .= ('<td></td>'x2);
+            }
+            $analysis_html.='</tr>'.$/;
+        }
+    }
+    $analysis_html.='</table>';
+    $r->print($analysis_html);
+}
+
+
+sub RR_concept_plot {
+    my ($concepts,$foil_data,$title) = @_;
+    #
+    my %correct_by_concept;
+    my %incorrect_by_concept;
+    my %true;
+    foreach my $concept (@$concepts) {
+        foreach my $foil (@{$concept->{'foils'}}) {
+            next if (! exists($foil_data->{$foil}));
+            foreach my $choice (keys(%{$foil_data->{$foil}})) {
+                if ($choice eq $foil) {
+                    $correct_by_concept{$concept->{'name'}} +=
+                        $foil_data->{$foil}->{$choice};
+                } else {
+                    $incorrect_by_concept{$concept->{'name'}} +=
+                        $foil_data->{$foil}->{$choice};
+                    
+                }
+            }
+        }
+    }
+    # 
+    # need arrays for incorrect and correct because we want to use different
+    # colors for them
+    my @correct;
+    #
+    my $total =0;
+    for (my $i=0;$i<scalar(@$concepts);$i++) {
+        my $concept = $concepts->[$i];
+        $correct[$i]   =   $correct_by_concept{$concept->{'name'}};
+        $total += $correct_by_concept{$concept->{'name'}}+
+            $incorrect_by_concept{$concept->{'name'}};
+    }
+    if ($total == 0) { return ''; };
+    for (my $i=0;$i<=$#correct;$i++) { 
+        $correct[$i] = sprintf('%0f',$correct[$i]/$total*100);
+    }
+    my $xlabel = 'concept';
+    $title.= ' (N='.$total.')';
+    my $plot=  &Apache::loncommon::DrawBarGraph($title,
+                                                $xlabel,
+                                                'Percent Choosing',
+                                                100,
+                                                ['#33ff00','#ff3300'],
+                                                undef,
+                                                \@correct);
+    return $plot;
+}
+
+
+sub RR_create_percent_selected_plot {
+    my ($foils,$foil_data,$title) = @_;
+    #
+    my %foil_selections;
+    my %true;
+    foreach my $foil (@$foils) {
+        # foil_data has format $foil_data->{true_foil}->{selected foil}
+        next if (! exists($foil_data->{$foil}));
+        $true{$foil}++;
+        while (my ($f,$count)= each(%{$foil_data->{$foil}})) {
+            $foil_selections{$f}+=$count;
+        }
+    }
+    # 
+    # need arrays for incorrect and correct because we want to use different
+    # colors for them
+    my @correct;
+    my @incorrect;
+    #
+    my $total =0;
+    for (my $i=0;$i<scalar(@$foils);$i++) {
+        my $foil = $foils->[$i];
+        if ($true{$foil}) {
+            $correct[$i]   = $foil_selections{$foil};
+            $incorrect[$i] = 0;
+        } else {
+            $correct[$i]   = 0;
+            $incorrect[$i] = $foil_selections{$foil};
+        }
+        $total+=$foil_selections{$foil};
+    }
+    if ($total == 0) { return ''; };
+    for (my $i=0;$i<=$#correct;$i++) { 
+        $correct[$i] = sprintf('%0f',$correct[$i]/$total*100);
+    }
+    for (my $i=0;$i<=$#incorrect;$i++) {
+        $incorrect[$i] = sprintf('%0f',$incorrect[$i]/$total*100);
+    }
+    my $xlabel = 'foil chosen';
+    $title.= ' (N='.$total.')';
+    my $plot=  &Apache::loncommon::DrawBarGraph($title,
+                                                $xlabel,
+                                                'Percent Choosing',
+                                                100,
+                                                ['#33ff00','#ff3300'],
+                                                undef,
+                                                \@correct,
+                                                \@incorrect);
+    return $plot;
+}
+
+
+sub RR_create_stacked_selection_plot {
+    my ($foils,$foil_data,$title)=@_;
+    #
+    my @correct_choice; # the green row
+    my @dataset; # array of array refs - multicolor rows.
+    my %filled;
+    my @labels;
+    my $count=-1;
+    my %column;
+    for (my $i=0;$i<scalar(@$foils);$i++) {
+        next if (! exists($foil_data->{$foils->[$i]}));
+        my $correct_foil = $foils->[$i];
+        push(@labels,$i+1);
+        $column{$correct_foil}= ++$count;
+        for (my $j=0;$j<scalar(@$foils);$j++) {
+            my $value = 0;
+            if ($i != $j ) {
+                $value += $foil_data->{$correct_foil}->{$foils->[$j]};
+            }
+            $dataset[$j]->[$column{$correct_foil}]=$value;
+        }
+    }
+    #
+    return '' if (! scalar(keys(%column)));
+    #
+    my $grand_total = 0;
+    my %count_per_foil;
+    while (my ($foil,$bar) = each (%column)) {
+        my $bar_total = 0;
+        for (my $j=0;$j<scalar(@dataset);$j++) {
+            $bar_total += $dataset[$j]->[$bar];
+        }
+        next if ($bar_total == 0);
+        for (my $j=0;$j<scalar(@dataset);$j++) {
+            $dataset[$j]->[$bar] = 
+                sprintf('%2f',$dataset[$j]->[$bar]/$bar_total * 100);
+        }
+        $count_per_foil{$foil}=' (N='.$bar_total.')';
+        $grand_total += $bar_total;
+    }
+    if ($grand_total == 0) {
+        return ('',undef);
+    }
+    my @empty_row = ();
+    foreach (@{$dataset[0]}) {
+        push(@empty_row,0);
+    }
+    #
+    $title .= ' (N='.$grand_total.')';
+    my $graph = &Apache::loncommon::DrawBarGraph
+        ($title,'Correct Foil','foils chosen Incorrectly',
+         100,$plotcolors,\@labels,\@empty_row,@dataset);
+    return ($graph,\%count_per_foil);
+}
+
+
+# if $correct is a hash ref, it is assumed to be indexed by student names.
+#    the values are assumed to be hash refs with a key of 'answer'.
+sub RR_classify_response_data {
+    my ($full_row_data,$correct,$function) = @_;
+    my %submission_data;
+    foreach my $row (@$full_row_data) {
+        my %subm = &hashify_attempt($row);
+        if (ref($correct) eq 'HASH') {
+            $subm{'correct'} = $correct->{$subm{'student'}};
+        } else {
+            $subm{'correct'} = $correct;
+        }
+        $subm{'submission'} =~ s/=\d+\s*$//;
+        if (&$function(\%subm)) {
+            $submission_data{$subm{'correct'}}->{$subm{'submission'}}++;
+        }
+    }
+    return \%submission_data;
+}
+
+sub RR_static_time_analysis {
+    my ($r,$problem,$problem_analysis) = @_;
+    my ($resource,$partid,$respid) = ($problem->{'resource'},
+                                      $problem->{'part'},
+                                      $problem->{'respid'});
+    $r->print('<h3>The time answer you seek is static</h3>');
+    my $analysis_html;
+    # Gather student data
+    my $response_data = &Apache::loncoursedata::get_response_data
+        (\@Apache::lonstatistics::SelectedSections,
+         $Apache::lonstatistics::enrollment_status,
+         $resource->{'symb'},$respid);
+    if (! defined($response_data) || 
+        ref($response_data) ne 'ARRAY' ) {
         $analysis_html = '<h2>'.
             &mt('There is no submission data for this resource').
             '</h2>';
         $r->print($analysis_html);
         return;
     }
-    if (exists($ENV{'form.ExcelOutput'})) {
-        $analysis_html .= &RR_Excel_output($r,$problem->{'resource'},
-                                           $PerformanceData,$ProblemData);
-    } elsif ($ENV{'form.AnalyzeOver'} eq 'Tries') {
-        $analysis_html .= &RR_Tries_Analysis($r,$problem->{'resource'},
-                                             $PerformanceData,$ProblemData);
-    } elsif ($ENV{'form.AnalyzeOver'} eq 'Time') {
-        $analysis_html .= &RR_Time_Analysis($r,$problem->{'resource'},
-                                            $PerformanceData,$ProblemData);
+    # for time division
+
+    #    limit to between start time & end time
+    #    loop through data, classifying it by
+    #         correct foil -> selected foil
+    #    if there is concept data
+    #         make a concept correct plot
+    #    for each correct foil
+    #         make a plot of the data
+
+}
+
+
+=pod
+
+
+    } elsif ($ENV{'form.AnalyzeOver'} eq 'tries') {
+        $analysis_html .= &RR_tries_Analysis($r,$problem->{'resource'},
+                                             $PerformanceData,$problem_data);
+    } elsif ($ENV{'form.AnalyzeOver'} eq 'time') {
+        $analysis_html .= &RR_time_Analysis($r,$problem->{'resource'},
+                                            $PerformanceData,$problem_data);
     } else {
         $analysis_html .= '<h2>'.
            &mt('The analysis you have selected is not supported at this time').
-           '</h2>';
+            '</h2>';
     }
     $r->print($analysis_html);
 }
 
 sub RR_Excel_output   { 
-    my ($r,$PerformanceData,$ProblemData) = @_;
+    my ($r,$PerformanceData,$problem_data) = @_;
     return '<h1>No!</h1>';
 }
 
-sub RR_Tries_Analysis { 
-    my ($r,$resource,$PerformanceData,$ProblemData) = @_;
+sub RR_tries_Analysis { 
+    my ($r,$resource,$PerformanceData,$problem_data) = @_;
     my $analysis_html;
     my $mintries = 1;
     my $maxtries = $ENV{'form.NumPlots'};
-    my ($table,$Foils,$Concepts) = &build_foil_index($ProblemData);
-    if ((! defined($Concepts)) || ((@$Concepts < 2) && 
-                                   ($ENV{'form.AnalyzeAs'} ne 'Foils'))) {
+    my ($table,$Foils,$Concepts) = &build_foil_index($problem_data);
+    if ((! defined($Concepts)) || (@$Concepts < 2)) {
         $table = '<h3>'.
             &mt('Not enough data for concept analysis.  '.
                 'Performing Foil Analysis').
             '</h3>'.$table;
-        $ENV{'form.AnalyzeAs'} = 'Foils';
     }
     $analysis_html .= $table;
     my @TryData = &RR_tries_data_analysis($r,$PerformanceData);
-#    if ($ENV{'form.AnalyzeAs'} eq 'Foils') {
-        $analysis_html .= &RR_Tries_Foil_Analysis($mintries,$maxtries,$Foils,
-                                                 \@TryData,$ProblemData);
-#    } else {
-#        $analysis_html = &RR_Tries_Concept_Analysis($mintries,$maxtries,
-#                                                    $Concepts,
-#                                                    \@TryData,
-#                                                    $ProblemData);
-#    }
+        $analysis_html .= &RR_tries_Foil_Analysis($mintries,$maxtries,$Foils,
+                                                 \@TryData,$problem_data);
     return $analysis_html;
 }
 
@@ -460,14 +779,14 @@ sub RR_tries_data_analysis {
     return @TryData;
 }
 
-sub RR_Time_Analysis  { 
-    my ($r,$PerformanceData,$ProblemData) = @_;
+sub RR_time_Analysis  { 
+    my ($r,$PerformanceData,$problem_data) = @_;
     my $html;
     return $html;
 }
 
-sub RR_Tries_Foil_Analysis {
-    my ($min,$max,$Foils,$TryData,$ProblemData) = @_;
+sub RR_tries_Foil_Analysis {
+    my ($min,$max,$Foils,$TryData,$problem_data) = @_;
     my $html;
     #
     # Compute the data neccessary to make the plots
@@ -486,7 +805,7 @@ sub RR_Tries_Foil_Analysis {
                 push (@PlotData_Correct,0);
                 push (@PlotData_Incorrect,0);
             } else {
-                if ($ProblemData->{'_Foils'}->{$foilid}->{'value'} eq 'true') {
+                if ($problem_data->{'_Foils'}->{$foilid}->{'value'} eq 'true') {
                     push (@PlotData_Correct,
                           int(100*$DataSet{$foilid}/$total));
                     push (@PlotData_Incorrect,0);
@@ -497,8 +816,8 @@ sub RR_Tries_Foil_Analysis {
                 }
             }
         }
-        my $title='Attempt '.$try;
-        my $xlabel = $total.' Submissions';
+        my $title='Attempt '.$try.' (N='.$total.')';
+        my $xlabel = 'Foil Chosen';
         $html.=  &Apache::loncommon::DrawBarGraph($title,
                                                   $xlabel,
                                                   'Percent Choosing',
@@ -511,20 +830,20 @@ sub RR_Tries_Foil_Analysis {
     return $html;
 }
 
-sub RR_Tries_Concept_Analysis {
-    my ($min,$max,$Concepts,$ResponseData,$ProblemData) = @_;
+sub RR_tries_Concept_Analysis {
+    my ($min,$max,$Concepts,$ResponseData,$problem_data) = @_;
     my $html;
     return $html;
 }
 
-sub RR_Time_Foil_Analysis {
-    my ($min,$max,$Foils,$ResponseData,$ProblemData) = @_;
+sub RR_time_Foil_Analysis {
+    my ($min,$max,$Foils,$ResponseData,$problem_data) = @_;
     my $html;
     return $html;
 }
 
-sub RR_Time_Concept_Analysis {
-    my ($min,$max,$Concepts,$ResponseData,$ProblemData) = @_;
+sub RR_time_Concept_Analysis {
+    my ($min,$max,$Concepts,$ResponseData,$problem_data) = @_;
     my $html;
     return $html;
 }
@@ -561,6 +880,8 @@ sub get_Radio_problem_data {
     return %Partdata;
 }
 
+=cut
+
 #########################################################
 #########################################################
 ##
@@ -569,7 +890,7 @@ sub get_Radio_problem_data {
 #########################################################
 #########################################################
 sub OptionResponseAnalysis {
-    my ($r,$problem,$ProblemData,$Students) = @_;
+    my ($r,$problem,$problem_data,$Students) = @_;
     my ($resource,$respid) = ($problem->{'resource'},
                               $problem->{'respid'});
     # Note: part data is not needed.
@@ -587,19 +908,19 @@ sub OptionResponseAnalysis {
         if (exists($ENV{'form.ExcelOutput'})) {
             my $result = &OR_excel_sheet($r,$resource,
                                          $PerformanceData,
-                                         $ProblemData);
+                                         $problem_data);
             $r->print($result);
             $r->rflush();
         } else {
-            if ($ENV{'form.AnalyzeOver'} eq 'Tries') {
+            if ($ENV{'form.AnalyzeOver'} eq 'tries') {
                 my $analysis_html = &OR_tries_analysis($r,
                                                     $PerformanceData,
-                                                    $ProblemData);
+                                                    $problem_data);
                 $r->print($analysis_html);
                 $r->rflush();
-            } elsif ($ENV{'form.AnalyzeOver'} eq 'Time') {
+            } elsif ($ENV{'form.AnalyzeOver'} eq 'time') {
                 my $analysis_html = &OR_time_analysis($PerformanceData,
-                                                   $ProblemData);
+                                                   $problem_data);
                 $r->print($analysis_html);
                 $r->rflush();
             } else {
@@ -614,7 +935,7 @@ sub OptionResponseAnalysis {
 
 #########################################################
 #
-#       Option Response:  Tries Analysis
+#       Option Response:  tries Analysis
 #
 #########################################################
 sub OR_tries_analysis {
@@ -622,78 +943,106 @@ sub OR_tries_analysis {
     my $mintries = 1;
     my $maxtries = $ENV{'form.NumPlots'};
     my ($table,$Foils,$Concepts) = &build_foil_index($ORdata);
-    if (! defined($Concepts) || 
-        ((@$Concepts < 2) && ($ENV{'form.AnalyzeAs'} ne 'Foils'))) {
-        $table = '<h3>'.
-            &mt('Not enough data for concept analysis.  '.
-                'Performing Foil Analysis').
-            '</h3>'.$table;
-        $ENV{'form.AnalyzeAs'} = 'Foils';
-    }
-    my %ResponseData = &OR_analyze_by_tries($r,$PerformanceData,
+    my %response_data = &OR_analyze_by_tries($r,$PerformanceData,
                                                      $mintries,$maxtries);
     my $analysis = '';
-    if ($ENV{'form.AnalyzeAs'} eq 'Foils') {
-        $analysis = &OR_Tries_Foil_Analysis($mintries,$maxtries,$Concepts,
-                                         \%ResponseData,$ORdata);
-    } else {
-        $analysis = &OR_Tries_Concept_Analysis($mintries,$maxtries,
-                                            $Concepts,\%ResponseData,$ORdata);
-    }
-    $table .= $analysis;
-    return $table;
-}
-
-sub OR_Tries_Foil_Analysis {
-    my ($mintries,$maxtries,$Concepts,$respdat,$ORdata) = @_;
-    my %ResponseData = %$respdat;
     #
-    # Compute the data neccessary to make the plots
-    my @PlotData; 
-    foreach my $concept (@$Concepts) {
+    # Compute the data necessary to make the plots
+    my @foil_plot; 
+    my @concept_data;
+    for (my $j=0;$j<=scalar(@$Concepts);$j++) {
+        my $concept = $Concepts->[$j];
         foreach my $foilid (@{$concept->{'foils'}}) {
             for (my $try=$mintries;$try<=$maxtries;$try++) {
-                if ($ResponseData{$foilid}->[$try]->{'_total'} == 0) {
-                    push(@{$PlotData[$try]->{'_correct'}},0);
+                # concept analysis data
+                $concept_data[$j]->[$try]->{'_correct'} +=
+                    $response_data{$foilid}->[$try]->{'_correct'};
+                $concept_data[$j]->[$try]->{'_total'} +=
+                    $response_data{$foilid}->[$try]->{'_total'};
+                #
+                # foil analysis data
+                if ($response_data{$foilid}->[$try]->{'_total'} == 0) {
+                    push(@{$foil_plot[$try]->{'_correct'}},0);
                 } else {
-                    push(@{$PlotData[$try]->{'_correct'}},
-                         100*$ResponseData{$foilid}->[$try]->{'_correct'}/
-                         $ResponseData{$foilid}->[$try]->{'_total'});
+                    push(@{$foil_plot[$try]->{'_correct'}},
+                         100*$response_data{$foilid}->[$try]->{'_correct'}/
+                         $response_data{$foilid}->[$try]->{'_total'});
                 }
                 foreach my $option (@{$ORdata->{'_Options'}}) {
-                    push(@{$PlotData[$try]->{'_total'}},
-                         $ResponseData{$foilid}->[$try]->{'_total'});
-                    if ($ResponseData{$foilid}->[$try]->{'_total'} == 0) {
-                        push (@{$PlotData[$try]->{$option}},0);
+                    push(@{$foil_plot[$try]->{'_total'}},
+                         $response_data{$foilid}->[$try]->{'_total'});
+                    if ($response_data{$foilid}->[$try]->{'_total'} == 0) {
+                        push (@{$foil_plot[$try]->{$option}},0);
                     } else {
-                        if ($ResponseData{$foilid}->[$try]->{'_total'} ==
-                            $ResponseData{$foilid}->[$try]->{'_correct'}) {
-                            push(@{$PlotData[$try]->{$option}},0);
+                        if ($response_data{$foilid}->[$try]->{'_total'} ==
+                            $response_data{$foilid}->[$try]->{'_correct'}) {
+                            push(@{$foil_plot[$try]->{$option}},0);
                         } else {
-                            push (@{$PlotData[$try]->{$option}},
+                            push (@{$foil_plot[$try]->{$option}},
                                   100 * 
-                                  $ResponseData{$foilid}->[$try]->{$option} / 
-                                  ($ResponseData{$foilid}->[$try]->{'_total'} 
+                                  $response_data{$foilid}->[$try]->{$option} / 
+                                  ($response_data{$foilid}->[$try]->{'_total'} 
                                    - 
-                                   $ResponseData{$foilid}->[$try]->{'_correct'}
+                                   $response_data{$foilid}->[$try]->{'_correct'}
                                    ));
                         }
                     }
                 } # End of foreach my $option
             }
         } # End of foreach my $foilid
-    } # End of foreach my $concept
+    } # End of concept loops
     # 
     # Build a table for the plots
     my $analysis_html = "<table>\n";
     my $optionkey = &build_option_index($ORdata);
+    my $num_concepts = 1;
+    if (defined($Concepts)) { $num_concepts = scalar(@$Concepts); }
+    #
     for (my $try=$mintries;$try<=$maxtries;$try++) {
-        my $count = $ResponseData{'_total'}->[$try];
-        my $title = 'Submission '.$try.' (N='.$count.')';
+        if (! defined($response_data{'_total'}->[$try]) ||
+            $response_data{'_total'}->[$try] == 0) { 
+            if ($try > 1) {
+                $analysis_html.= '<tr><td align="center" colspan="4"><b>'.
+                    &mt('None of the selected students attempted the problem more than [_1] times.',$try-1).
+                    '</b></td></tr>';
+            } else {
+                $analysis_html.= '<tr><td colspan="4" align="center"><b>'.
+                    &mt('None of the selected students have attempted the problem').'</b></td></tr>';
+            }
+            last;
+        }
+        my $concept_graph='';
+        if ($num_concepts > 1) {
+            #
+            # Create concept plot
+            my @concept_plot_data;
+            for (my $j=0;$j<=$#concept_data;$j++) {
+                my $total = $concept_data[$j]->[$try]->{'_total'};
+                if ($total == 0) {
+                    $concept_plot_data[$j] = 0;
+                } else {
+                    $concept_plot_data[$j] = 100 * 
+                        sprintf('%0.3f',
+                                $concept_data[$j]->[$try]->{'_correct'} / 
+                                $total);
+                }
+            }
+            #
+            my $title;
+            my $count = $response_data{'_total'}->[$try];
+            $title = 'Attempt '.$try.' (N='.$count.')';
+            $concept_graph = &Apache::loncommon::DrawBarGraph
+                ($title,'Concept Number','Percent Correct',
+                 100,$plotcolors,undef,\@concept_plot_data);
+        }
+        #
+        # Create Foil Plots
+        my $count = $response_data{'_total'}->[$try];
+        my $title = 'Attempt '.$try.' (N='.$count.')';
         my @Datasets;
         foreach my $option ('_correct',@{$ORdata->{'_Options'}}) {
-            next if (! exists($PlotData[$try]->{$option}));
-            push(@Datasets,$PlotData[$try]->{$option});
+            next if (! exists($foil_plot[$try]->{$option}));
+            push(@Datasets,$foil_plot[$try]->{$option});
         }
         #
         # Put a blank in the data set between concepts
@@ -720,10 +1069,9 @@ sub OR_Tries_Foil_Analysis {
             push(@Labels,'');
         }
         #
-        my $correctgraph = &Apache::loncommon::DrawBarGraph
+        my $correct_graph = &Apache::loncommon::DrawBarGraph
             ($title,'Foil Number','Percent Correct',
              100,$plotcolors,\@Labels,$Datasets[0]);
-        $analysis_html.= '<tr><td>'.$correctgraph.'</td>';
         
         #
         #
@@ -731,83 +1079,23 @@ sub OR_Tries_Foil_Analysis {
         for (my $i=0; $i< scalar(@{$Datasets[0]});$i++) {
             $Datasets[0]->[$i]=0;
         }
-        $count = $ResponseData{'_total'}->[$try] - 
-                                           $ResponseData{'_correct'}->[$try];
-        $title = 'Submission '.$try.' (N='.$count.')';
-        my $incorrectgraph = &Apache::loncommon::DrawBarGraph
+        $count = $response_data{'_total'}->[$try] - 
+                                           $response_data{'_correct'}->[$try];
+        $title = 'Attempt '.$try.' (N='.$count.')';
+        my $incorrect_graph = &Apache::loncommon::DrawBarGraph
             ($title,'Foil Number','% Option Chosen Incorrectly',
              100,$plotcolors,\@Labels,@Datasets);
-        $analysis_html.= '<td>'.$incorrectgraph.'</td>';
-        $analysis_html.= '<td>'.$optionkey."<td></tr>\n";
+        $analysis_html.= 
+            '<tr>'.
+            '<td>'.$concept_graph.'</td>'.
+            '<td>'.$correct_graph.'</td>'.
+            '<td>'.$incorrect_graph.'</td>'.
+            '<td>'.$optionkey.'<td>'.
+            '</tr>'.$/;
     }
     $analysis_html .= "</table>\n";
-    return $analysis_html;
-}
-
-sub OR_Tries_Concept_Analysis {
-    my ($mintries,$maxtries,$Concepts,$respdat,$ORdata) = @_;
-    my %ResponseData = %$respdat;
-    my $analysis_html = "<table>\n";
-    #
-    # Compute the data neccessary to make the plots
-    my @PlotData;
-    # Concept analysis
-    #
-    # Note: we do not bother with characterizing the students incorrect
-    # answers at the concept level because an incorrect answer for one foil
-    # may be a correct answer for another foil.
-    my %ConceptData;
-    foreach my $concept (@{$Concepts}) {
-        for (my $i=$mintries;$i<=$maxtries;$i++) {
-            #
-            # Gather the per-attempt data
-            my $cdata = $ConceptData{$concept}->[$i];
-            foreach my $foilid (@{$concept->{'foils'}}) {
-                $cdata->{'_correct'} += 
-                    $ResponseData{$foilid}->[$i]->{'_correct'};
-                $cdata->{'_total'}   += 
-                    $ResponseData{$foilid}->[$i]->{'_total'};
-            }
-            push (@{$PlotData[$i]->{'_total'}},$cdata->{'_total'});
-            if ($cdata->{'_total'} == 0) {
-                push (@{$PlotData[$i]->{'_correct'}},0);
-            } else {
-                push (@{$PlotData[$i]->{'_correct'}},
-                      100*$cdata->{'_correct'}/$cdata->{'_total'});
-                }
-        }
-    }
-    # Build a table for the plots
-    for (my $i=$mintries;$i<=$maxtries;$i++) {
-        my $minstu = $PlotData[$i]->{'_total'}->[0];
-        my $maxstu = $PlotData[$i]->{'_total'}->[0];
-        foreach my $count (@{$PlotData[$i]->{'_total'}}) {
-            if ($minstu > $count) {
-                $minstu = $count;
-            }
-            if ($maxstu < $count) {
-                $maxstu = $count;
-            }
-        }
-        $maxstu = 0 if (! defined($maxstu));
-        $minstu = 0 if (! defined($minstu));
-        my $title;
-        my $count = $ResponseData{'_total'}->[$i];
-        if ($count == 0) {
-            $count = 'no submissions';
-        } elsif ($count == 1) {
-            $count = '1 submission';
-        } else {
-            $count = $count.' submissions';
-        }
-        $title = 'Attempt '.$i.', '.$count;
-        my $graphlink = &Apache::loncommon::DrawBarGraph
-            ($title,'Concept Number','Percent Correct',
-             100,$plotcolors,undef,$PlotData[$i]->{'_correct'});
-        $analysis_html.= '<tr><td>'.$graphlink."</td></tr>\n";
-    }
-    $analysis_html .= "</table>\n";
-    return $analysis_html;
+    $table .= $analysis_html;
+    return $table;
 }
 
 sub OR_analyze_by_tries {
@@ -839,17 +1127,21 @@ sub OR_analyze_by_tries {
 #
 #########################################################
 sub OR_time_analysis {
-    my ($PerformanceData,$ORdata) = @_;
+    my ($performance_data,$ORdata) = @_;
     my ($table,$Foils,$Concepts) = &build_foil_index($ORdata);
-    if ((@$Concepts < 2) && ($ENV{'form.AnalyzeAs'} ne 'Foils')) {
+    my $foilkey = &build_option_index($ORdata);
+    my $num_concepts = 1;
+    if (defined($Concepts)) { $num_concepts = scalar(@$Concepts); }
+    #
+    if ($num_concepts < 2) {
         $table = '<h3>'.
             &mt('Not enough data for concept analysis.  '.
                 'Performing Foil Analysis').
-            '</h3>'.$table;
-        $ENV{'form.AnalyzeAs'} = 'Foils';
+                '</h3>'.$table;
     }
+    #
     my $num_plots = $ENV{'form.NumPlots'};
-    my $num_data = scalar(@$PerformanceData)-1;
+    my $num_data = scalar(@$performance_data)-1;
     my $percent = sprintf('%2f',100/$num_plots);
     #
     $table .= "<table>\n";
@@ -861,16 +1153,20 @@ sub OR_time_analysis {
             ('enddate_'.$i);
         if (! defined($starttime) || ! defined($endtime)) {
             my $sec_in_day = 86400;
-            my $last_sub_time = &get_time_from_row($PerformanceData->[-1]);
+            my $last_sub_time = &get_time_from_row($performance_data->[-1]);
             my ($sday,$smon,$syear);
             (undef,undef,undef,$sday,$smon,$syear) = 
                 localtime($last_sub_time - $sec_in_day*$i);
             $starttime = &Time::Local::timelocal(0,0,0,$sday,$smon,$syear);
             $endtime = $starttime + $sec_in_day;
             if ($i == ($num_plots -1 )) {
-                $starttime = &get_time_from_row($PerformanceData->[0]);
+                $starttime = &get_time_from_row($performance_data->[0]);
             }
         }
+        $table .= '<tr><td colspan="4" align="center">'.
+            &mt('Data from [_1] to [_2]',
+                &Apache::lonlocal::locallocaltime($starttime),
+                &Apache::lonlocal::locallocaltime($endtime)).'</td></tr>'.$/;
         my $startdateform = &Apache::lonhtmlcommon::date_setter
             ('Statistics','startdate_'.$i,$starttime);
         my $enddateform = &Apache::lonhtmlcommon::date_setter
@@ -879,13 +1175,17 @@ sub OR_time_analysis {
         my $begin_index;
         my $end_index;
         my $j;
-        while (++$j < scalar(@$PerformanceData)) {
-            last if (&get_time_from_row($PerformanceData->[$j]) 
+        while (++$j < scalar(@$performance_data)) {
+            last if (&get_time_from_row($performance_data->[$j]) 
                                                               > $starttime);
         }
         $begin_index = $j;
-        while (++$j < scalar(@$PerformanceData)) {
-            last if (&get_time_from_row($PerformanceData->[$j]) > $endtime);
+        while ($j < scalar(@$performance_data)) {
+            if (&get_time_from_row($performance_data->[$j]) > $endtime) {
+                last;
+            } else {
+                $j++;
+            }
         }
         $end_index = $j;
         ##
@@ -895,29 +1195,44 @@ sub OR_time_analysis {
             startdateform => $startdateform,
             enddateform   => $enddateform,
         };
-        if ($ENV{'form.AnalyzeAs'} eq 'Foils') {
-            $table .= &OR_Foil_Time_Analysis($PerformanceData,$ORdata,$Foils,
+        my $concept_correct_plot = '';
+        if ($num_concepts > 1) {
+            $concept_correct_plot = 
+                &OR_Concept_Time_Analysis($performance_data,
+                                          $ORdata,$Concepts,
                                           $interval);
-        } else {
-            $table .= &OR_Concept_Time_Analysis($PerformanceData,$ORdata,
-                                             $Concepts,$interval);
         }
+        my ($foil_correct_plot,$foil_incorrect_plot) = 
+            &OR_Foil_Time_Analysis($performance_data,$ORdata,
+                                   $Foils,$Concepts,$interval);
+        $table .= '<tr>'.
+            '<td>'.$concept_correct_plot.'</td>'.
+            '<td>'.$foil_correct_plot.'</td>'.
+            '<td>'.$foil_incorrect_plot.'</td>'.
+            '<td align="left" valign="top">'.$foilkey.'</td></tr>'.$/;
+        $table .= '<tr><td colspan="4" align="center">'.
+            &mt('Start time: [_1]',
+                $interval->{'startdateform'}).'<br />'.
+            &mt('End time: [_1]',
+                $interval->{'enddateform'}).
+                '</td></tr>'.$/;
+        $table.= '<tr><td colspan="4">&nbsp</td></tr>'.$/;
     }
+    $table .= '</table>';
     #
     return $table;
 }
 
 sub OR_Foil_Time_Analysis {
-    my ($PerformanceData,$ORdata,$Foils,$interval) = @_;
+    my ($performance_data,$ORdata,$Foils,$Concepts,$interval) = @_;
     my $analysis_html;
-    my $foilkey = &build_option_index($ORdata);
     my ($begin_index,$end_index) = ($interval->{'begin_index'},
                                     $interval->{'end_index'});
     my %TimeData;
     #
     # Compute the number getting the foils correct or incorrects
     for (my $j=$begin_index;$j<=$end_index;$j++) {
-        my $row = $PerformanceData->[$j];
+        my $row = $performance_data->[$j];
         next if (! defined($row));
         my %Row = &Process_OR_Row($row);
         while (my ($foilid,$href) = each(%Row)) {
@@ -930,83 +1245,80 @@ sub OR_Foil_Time_Analysis {
             }
         }
     }
-    my @Plotdata;
-    foreach my $foil (@$Foils) {
-        my $total = $TimeData{$foil}->{'_total'};
-        if ($total == 0) {
-            push(@{$Plotdata[0]},0);
-        } else {
-            push(@{$Plotdata[0]},
-                 100 * $TimeData{$foil}->{'_correct'} / $total);
-        }
-        my $total_incorrect = $total - $TimeData{$foil}->{'_correct'};
-        my $optionidx = 1;
-        foreach my $option (@{$ORdata->{'_Options'}}) {
-            if ($total_incorrect == 0) {
-                push(@{$Plotdata[$optionidx]},0);
+    my @plotdata;
+    my @labels;
+    foreach my $concept (@{$Concepts}) {
+        foreach my $foil (@{$concept->{'foils'}}) {
+            push(@labels,scalar(@labels)+1);
+            my $total = $TimeData{$foil}->{'_total'};
+            if ($total == 0) {
+                push(@{$plotdata[0]},0);
             } else {
-                push(@{$Plotdata[$optionidx]},
-                     100 * $TimeData{$foil}->{$option} / $total_incorrect);
+                push(@{$plotdata[0]},
+                     100 * $TimeData{$foil}->{'_correct'} / $total);
             }
-        } continue {
-            $optionidx++;
+            my $total_incorrect = $total - $TimeData{$foil}->{'_correct'};
+            for (my $i=0;$i<scalar(@{$ORdata->{'_Options'}});$i++) {
+                my $option = $ORdata->{'_Options'}->[$i];
+                if ($total_incorrect == 0) {
+                    push(@{$plotdata[$i+1]},0);
+                } else {
+                    push(@{$plotdata[$i+1]},
+                         100 * $TimeData{$foil}->{$option} / $total_incorrect);
+                }
+            }
+        }
+        # Put in a blank one
+        push(@labels,'');
+        push(@{$plotdata[0]},0);
+        for (my $i=0;$i<scalar(@{$ORdata->{'_Options'}});$i++) {
+            push(@{$plotdata[$i+1]},0);
         }
     }
     #
     # Create the plot
     my $count = $end_index-$begin_index;
+    return ('No data','') if ($count <= 0);
     my $title;
     if ($count == 0) {
         $title = 'no submissions';
     } elsif ($count == 1) {
         $title = 'one submission';
-    } else {
+    } elsif ($count > 1) {
         $title = $count.' submissions';
     }
-    my $correctplot = &Apache::loncommon::DrawBarGraph($title,
+    my $correct_plot = &Apache::loncommon::DrawBarGraph($title,
                                                        'Foil Number',
                                                        'Percent Correct',
                                                        100,
                                                        $plotcolors,
                                                        undef,
-                                                       $Plotdata[0]);
-    for (my $j=0; $j< scalar(@{$Plotdata[0]});$j++) {
-        $Plotdata[0]->[$j]=0;
+                                                       $plotdata[0]);
+    for (my $j=0; $j< scalar(@{$plotdata[0]});$j++) {
+        $plotdata[0]->[$j]=0;
     }
     $count = $end_index-$begin_index-$TimeData{'_correct'};
     if ($count == 0) {
         $title = 'no submissions';
+    } elsif ($count < 0) {
+        return ($correct_plot,'');
     } elsif ($count == 1) {
         $title = 'one submission';
     } else {
         $title = $count.' submissions';
     }
-    my $incorrectplot = &Apache::loncommon::DrawBarGraph($title,
+    my $incorrect_plot = &Apache::loncommon::DrawBarGraph($title,
                                                  'Foil Number',
                                                  'Incorrect Option Choice',
                                                  100,
                                                  $plotcolors,
                                                  undef,
-                                                 @Plotdata);        
-    $analysis_html.='<tr>'.
-        '<td>'.$correctplot.'</td>'.
-        '<td>'.$incorrectplot.'</td>'.
-        '<td align="left" valign="top">'.$foilkey.'</td>'."</tr>\n";
-    $analysis_html.= '<tr>'.'<td colspan="3">'.
-        '<b>Start Time</b>:'.
-        ' &nbsp;'.$interval->{'startdateform'}.'<br />'.
-        '<b>End Time</b>&nbsp;&nbsp;: '.
-        '&nbsp;'.$interval->{'enddateform'}.'<br />'.
-#        '<b>Plot Title</b>&nbsp;&nbsp;:'.
-#        ("&nbsp;"x3).$interval->{'titleform'}.
-        '</td>'.
-        "</tr>\n";
-    return $analysis_html;
+                                                 @plotdata);
+    return ($correct_plot,$incorrect_plot);
 }
 
 sub OR_Concept_Time_Analysis {
-    my ($PerformanceData,$ORdata,$Concepts,$interval) = @_;
-    my $analysis_html;
+    my ($performance_data,$ORdata,$Concepts,$interval) = @_;
     ##
     ## Determine starttime, endtime, startindex, endindex
     my ($begin_index,$end_index) = ($interval->{'begin_index'},
@@ -1015,7 +1327,7 @@ sub OR_Concept_Time_Analysis {
     #
     # Compute the number getting the foils correct or incorrects
     for (my $j=$begin_index;$j<=$end_index;$j++) {
-        my $row = $PerformanceData->[$j];
+        my $row = $performance_data->[$j];
         next if (! defined($row));
         my %Row = &Process_OR_Row($row);
         while (my ($foilid,$href) = each(%Row)) {
@@ -1030,7 +1342,7 @@ sub OR_Concept_Time_Analysis {
     }
     #
     # Put the data in plottable form
-    my @Plotdata;
+    my @plotdata;
     foreach my $concept (@$Concepts) {
         my ($total,$correct);
         foreach my $foil (@{$concept->{'foils'}}) {
@@ -1038,32 +1350,21 @@ sub OR_Concept_Time_Analysis {
             $correct += $TimeData{$foil}->{'_correct'};
         }
         if ($total == 0) {
-            push(@Plotdata,0);
+            push(@plotdata,0);
         } else {
-            push(@Plotdata,100 * $correct / $total);
+            push(@plotdata,100 * $correct / $total);
         }
     }
     #
     # Create the plot
     my $title = ($end_index - $begin_index).' submissions';
-    my $correctplot = &Apache::loncommon::DrawBarGraph($title,
-                                                    'Concept Number',
-                                                    'Percent Correct',
-                                                    100,
-                                                    $plotcolors,
-                                                    undef,
-                                                    \@Plotdata);
-    $analysis_html.='<tr>'.
-        '<td>'.$correctplot.'</td>'.
-        '<td align="left" valign="top">'.
-        '<b>Start Time</b>: &nbsp;'.$interval->{'startdateform'}.'<br />'.
-        '<b>End Time</b>&nbsp;&nbsp;: '.
-           '&nbsp;'.$interval->{'enddateform'}.'<br />'.
-#        '<b>Plot Title</b>&nbsp;&nbsp;:'.("&nbsp;"x3).
-#            $interval->{'titleform'}.
-        '</td>'.
-        "</tr>\n";
-    return $analysis_html;
+    return &Apache::loncommon::DrawBarGraph($title,
+                                            'Concept Number',
+                                            'Percent Correct',
+                                            100,
+                                            $plotcolors,
+                                            undef,
+                                            \@plotdata);
 }
 
 #########################################################
@@ -1074,7 +1375,7 @@ sub OR_Concept_Time_Analysis {
 #########################################################
 #########################################################
 sub OR_excel_sheet {
-    my ($r,$resource,$PerformanceData,$ORdata) = @_;
+    my ($r,$resource,$performance_data,$ORdata) = @_;
     my $response = '';
     my (undef,$Foils,$Concepts) = &build_foil_index($ORdata);
     #
@@ -1112,7 +1413,7 @@ sub OR_excel_sheet {
         # Do something useful
     }
     $result = &OR_build_response_data_worksheet($response_data_sheet,$format,
-                                             $PerformanceData,$Foils,
+                                             $performance_data,$Foils,
                                              $ORdata);
     if ($result ne 'okay') {
         # Do something useful
@@ -1200,7 +1501,7 @@ sub OR_build_problem_data_worksheet {
 }
 
 sub OR_build_response_data_worksheet {
-    my ($worksheet,$format,$PerformanceData,$Foils,$ORdata)=@_;
+    my ($worksheet,$format,$performance_data,$Foils,$ORdata)=@_;
     my $rows_output = 3;
     my $cols_output = 0;
     $worksheet->write($rows_output++,0,'Response Data',$format->{'h3'});
@@ -1213,18 +1514,18 @@ sub OR_build_response_data_worksheet {
     }
     $worksheet->write_row($rows_output++,0,\@Headers,$format->{'header'});
     #
-    foreach my $row (@$PerformanceData) {
+    foreach my $row (@$performance_data) {
         next if (! defined($row));
         my ($student,$award,$grading,$submission,$time,$tries) = @$row;
         my @Foilgrades = split('&',$grading);
         my @Foilsubs   = split('&',$submission);
-        my %ResponseData;
+        my %response_data;
         for (my $j=0;$j<=$#Foilgrades;$j++) {
             my ($foilid,$correct)  = split('=',$Foilgrades[$j]);
             my (undef,$submission) = split('=',$Foilsubs[$j]);
             $submission = &Apache::lonnet::unescape($submission);
-            $ResponseData{$foilid.' submission'}=$submission;
-            $ResponseData{$foilid.' award'}=$correct;
+            $response_data{$foilid.' submission'}=$submission;
+            $response_data{$foilid.' award'}=$correct;
         }
         $worksheet->write($rows_output,$cols_output++,$student);
         $worksheet->write($rows_output,$cols_output++,
@@ -1233,9 +1534,9 @@ sub OR_build_response_data_worksheet {
         $worksheet->write($rows_output,$cols_output++,$tries);
         foreach my $foilid (@$Foils) {
             $worksheet->write($rows_output,$cols_output++,
-                              $ResponseData{$foilid.' submission'});
+                              $response_data{$foilid.' submission'});
             $worksheet->write($rows_output,$cols_output++,
-                              $ResponseData{$foilid.' award'});
+                              $response_data{$foilid.' award'});
         }
         $rows_output++;
         $cols_output = 0;
@@ -1382,6 +1683,26 @@ sub build_option_index {
     $table .= "</table>\n";
 }
 
+sub build_foil_key {
+    my ($foils,$extra_data)= @_;
+    if (! defined($extra_data)) { $extra_data = {}; }
+    my $table = "<table>\n";
+    my $foil_index = 0;
+    my @rows;
+    foreach my $foil (&mt('correct foil chosen'),@{$foils}) {
+        push (@rows,
+              '<tr>'.
+              '<td bgcolor="'.$plotcolors->[$foil_index++].'">'.
+              ('&nbsp;'x4).'</td>'.
+              '<td>'.&HTML::Entities::encode($foil,'<>&"').
+              ('&nbsp;'x2).$extra_data->{$foil}.'</td>'.
+              "</tr>\n");
+    }
+    shift(@rows); # Throw away 'correct foil chosen' color
+    $table .= join('',reverse(@rows));
+    $table .= "</table>\n";
+}
+
 #########################################################
 #########################################################
 ##
@@ -1393,7 +1714,7 @@ sub CreateInterface {
     ##
     ## Environment variable initialization
     if (! exists$ENV{'form.AnalyzeOver'}) {
-        $ENV{'form.AnalyzeOver'} = 'Tries';
+        $ENV{'form.AnalyzeOver'} = 'tries';
     }
     ##
     ## Build the menu
@@ -1431,60 +1752,55 @@ sub CreateInterface {
     ##
     ##
     $Str .= '<td>';
-    { # These braces are here to organize the code, not scope it.
-        {
-            $Str .= '<nobr>'.&mt('Analyze Over ');
-            $Str .= &Apache::loncommon::help_open_topic
-                                                  ('Analysis_Analyze_Over');
-            $Str .='<select name="AnalyzeOver" >';
-            $Str .= '<option value="Tries" ';
-            if (! exists($ENV{'form.AnalyzeOver'}) || 
-                $ENV{'form.AnalyzeOver'} eq 'Tries'){
-                # Default to Tries
-                $Str .= ' selected ';
-            }
-            $Str .= '>'.&mt('Tries').'</option>';
-            $Str .= '<option value="Time" ';
-            $Str .= ' selected ' if ($ENV{'form.AnalyzeOver'} eq 'Time');
-            $Str .= '>'.&mt('Time').'</option>';
-            $Str .= '</select>';
-            $Str .= '</nobr><br />';
-        }
-        {
-            $Str .= '<nobr>'.&mt('Analyze as ');
-            $Str .= &Apache::loncommon::help_open_topic
-                                                  ('Analysis_Analyze_as');
-            $Str .='<select name="AnalyzeAs" >';
-            $Str .= '<option value="Concepts" ';
-            if (! exists($ENV{'form.AnalyzeAs'}) || 
-                $ENV{'form.AnalyzeAs'} eq 'Concepts'){
-                # Default to Concepts
-                $Str .= ' selected ';
-            }
-            $Str .= '>'.&mt('Concepts').'</option>';
-            $Str .= '<option value="Foils" ';
-            $Str .= ' selected ' if ($ENV{'form.AnalyzeAs'} eq 'Foils');
-            $Str .= '>'.&mt('Foils').'</option>';
-            $Str .= '</select></nobr><br />';
-        }
-        {
-            $Str .= '<br /><nobr>'.&mt('Number of Plots:');
-            $Str .= &Apache::loncommon::help_open_topic
-                                                  ('Analysis_num_plots');
-            $Str .= '<select name="NumPlots">';
-            if (! exists($ENV{'form.NumPlots'}) 
-                || $ENV{'form.NumPlots'} < 1 
-                || $ENV{'form.NumPlots'} > 20) {
-                $ENV{'form.NumPlots'} = 5;
-            }
-            foreach my $i (1,2,3,4,5,6,7,8,10,15,20) {
-                $Str .= '<option value="'.$i.'" ';
-                if ($ENV{'form.NumPlots'} == $i) { $Str.=' selected '; }
-                $Str .= '>'.$i.'</option>';
-            }
-            $Str .= '</select></nobr>';
-        }
-    }
+    ##
+    my $showprob_checkbox = 
+        '<input type="checkbox" name="show_prob" value="true" ';
+    if ($ENV{'form.show_prob'} eq 'true') {
+        $showprob_checkbox .= 'checked ';
+    }
+    $showprob_checkbox.= ' />';
+    $Str.= '<nobr><label>'.
+        &mt('Show problem [_1]',$showprob_checkbox).
+        '</label></nobr><br />';
+    ##
+    my $analyze_selector = '<select name="AnalyzeOver" >';
+    $analyze_selector .= '<option value="tries" ';
+    if (! exists($ENV{'form.AnalyzeOver'}) || 
+        $ENV{'form.AnalyzeOver'} eq 'tries'){
+        # Default to tries
+        $analyze_selector .= ' selected ';
+    }
+    $analyze_selector .= '>'.&mt('Tries').'</option>';
+    $analyze_selector .= '<option value="time" ';
+    $analyze_selector .= ' selected ' if ($ENV{'form.AnalyzeOver'} eq 'time');
+    $analyze_selector .= '>'.&mt('Time').'</option>';
+    $analyze_selector .= '</select>';
+    $Str .= '<nobr><label>'.
+        &mt('Analyze Over [_1] [_2]',
+            $analyze_selector,
+            &Apache::loncommon::help_open_topic('Analysis_Analyze_Over')).
+            '</label></nobr><br />'.$/;
+    ##
+    my $numplots_selector = '<select name="NumPlots">';
+    if (! exists($ENV{'form.NumPlots'}) 
+        || $ENV{'form.NumPlots'} < 1 
+        || $ENV{'form.NumPlots'} > 20) {
+        $ENV{'form.NumPlots'} = 5;
+    }
+    foreach my $i (1,2,3,4,5,6,7,8,10,15,20) {
+        $numplots_selector .= '<option value="'.$i.'" ';
+        if ($ENV{'form.NumPlots'} == $i) { $numplots_selector.=' selected '; }
+        $numplots_selector .= '>'.$i.'</option>';
+    }
+    $numplots_selector .= '</select></nobr><br />';
+    $Str .= '<nobr><label>'.&mt('Number of Plots [_1]',$numplots_selector).
+        '</label></nobr>';
+    ##
+    $Str .= '<nobr><label>'.&mt('Status: [_1]',
+                                 '<input type="text" '.
+                                 'name="stats_status" size="60" value="" />'
+                                 ).
+                    '</label></nobr>';
     $Str .= '</td>';
     ##
     ##
@@ -1519,8 +1835,9 @@ sub get_tries_from_row {
 sub hashify_attempt {
     my ($row) = @_;
     my %attempt;
+    $attempt{'student'}    = $row->[&Apache::loncoursedata::RD_sname()];
     $attempt{'tries'}      = $row->[&Apache::loncoursedata::RD_tries()];
-    $attempt{'submission'} = $row->[&Apache::loncoursedata::RD_submission()];
+    $attempt{'submission'} = &Apache::lonnet::unescape($row->[&Apache::loncoursedata::RD_submission()]);
     $attempt{'award'}      = $row->[&Apache::loncoursedata::RD_awarddetail()];
     $attempt{'timestamp'}  = $row->[&Apache::loncoursedata::RD_timestamp()];
     return %attempt;