--- loncom/interface/statistics/lonproblemstatistics.pm	2018/03/07 13:32:56	1.122.2.4
+++ loncom/interface/statistics/lonproblemstatistics.pm	2014/02/28 19:20:17	1.126
@@ -1,6 +1,6 @@
 # The LearningOnline Network with CAPA
 #
-# $Id: lonproblemstatistics.pm,v 1.122.2.4 2018/03/07 13:32:56 raeburn Exp $
+# $Id: lonproblemstatistics.pm,v 1.126 2014/02/28 19:20:17 bisitz Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -52,6 +52,7 @@ package Apache::lonproblemstatistics;
 use strict;
 use Apache::lonnet;
 use Apache::loncommon();
+use Apache::lonquickgrades();
 use Apache::lonhtmlcommon;
 use Apache::loncoursedata;
 use Apache::lonstatistics;
@@ -589,9 +590,9 @@ sub field_selection_input {
     $Str .= '<option value="all">'.&mt('all').'</option>'."\n";
     foreach my $field (@Fields) {
         next if ($field->{'selectable'} ne 'yes');
-        $Str .= '    <option value="'.$field->{'name'}.'"';
+        $Str .= '    <option value="'.$field->{'name'}.'" ';
         if ($field->{'selected'} eq 'yes') {
-            $Str .= ' selected="selected"';
+            $Str .= 'selected="selected" ';
         }
         $Str .= '>'.&mt($field->{'title'}).'</option>'."\n";
     }
@@ -704,6 +705,7 @@ sub BuildProblemStatisticsPage {
     # Finally let the user know we are here
     $r->print(&Apache::lonhtmlcommon::breadcrumbs('Overall Problem Statistics',
                                                 'Statistics_Overall_Key'));
+    &Apache::lonquickgrades::startGradeScreen($r,'statistics');
 
     my $interface = &CreateInterface($r);
     $r->print($interface);
@@ -1667,11 +1669,11 @@ sub compute_discrimination_factor {
     my $number_to_grab = int(scalar(@{$ranking})/4);
     my $num_students = scalar(@{$ranking});
     my @BottomSet = map { $_->[&Apache::loncoursedata::RNK_student()];
-                      } @{$ranking}[0..$number_to_grab-1];
+                      } @{$ranking}[0..$number_to_grab];
     my @TopSet    =
         map {
             $_->[&Apache::loncoursedata::RNK_student()];
-          } @{$ranking}[-$number_to_grab..-1];
+          } @{$ranking}[-$number_to_grab..0];
     if (! @BottomSet || (@BottomSet == 1 && $BottomSet[0] eq '') ||
         ! @TopSet    || (@TopSet    == 1 && $TopSet[0]    eq '')) {
         return 'nan';