".
@@ -417,6 +726,7 @@ sub statistics_html_table_data {
my $row = '';
foreach my $field (@Fields) {
next if ($options =~ /no $field->{'name'}/);
+ next if ($field->{'selected'} ne 'yes');
$row .= '
{'align'})) {
$row .= ' align="'.$field->{'align'}.'"';
@@ -443,6 +753,7 @@ sub statistics_table_header {
my $header_row;
foreach my $field (@Fields) {
next if ($options =~ /no $field->{'name'}/);
+ next if ($field->{'selected'} ne 'yes');
$header_row .= '
'."\n";
+ return $row;
+}
+
####################################################
####################################################
##
@@ -852,6 +1203,7 @@ sub Excel_output {
# Long Headers
foreach my $field (@Fields) {
next if ($field->{'name'} eq 'problem_num');
+ next if ($field->{'selected'} ne 'yes');
if (exists($field->{'long_title'})) {
$excel_sheet->write($rows_output,$cols_output++,
$field->{'long_title'});
@@ -863,6 +1215,7 @@ sub Excel_output {
$cols_output=0;
# Brief headers
foreach my $field (@Fields) {
+ next if ($field->{'selected'} ne 'yes');
next if ($field->{'name'} eq 'problem_num');
# Use english for excel as I am not sure how well excel handles
# other character sets....
@@ -872,6 +1225,7 @@ sub Excel_output {
foreach my $data (@StatsArray) {
$cols_output=0;
foreach my $field (@Fields) {
+ next if ($field->{'selected'} ne 'yes');
next if ($field->{'name'} eq 'problem_num');
$excel_sheet->write($rows_output,$cols_output++,
$data->{$field->{'name'}});
@@ -1021,11 +1375,13 @@ sub get_statistics {
$data->{'title.link'} = $resource->{'src'}.'?symb='.
&Apache::lonnet::escape($resource->{'symb'});
#
- $data->{'deg_of_disc'} = &compute_discrimination_factor($resource,$part,$sequence);
+ if ($SelectedFields{'deg_of_disc'}) {
+ $data->{'deg_of_disc'} =
+ &compute_discrimination_factor($resource,$part,$sequence);
+ }
return $data;
}
-
###############################################
###############################################
@@ -1082,6 +1438,70 @@ sub compute_discrimination_factor {
###############################################
###############################################
+##
+## Compute KR-21
+##
+## To compute KR-21, you need the following information:
+##
+## K=the number of items in your test
+## M=the mean score on the test
+## s=the standard deviation of the scores on your test
+##
+## then:
+##
+## KR-21 rk= [K/(K-1)] * [1- (M*(K-M))/(K*s^2))]
+##
+###############################################
+###############################################
+sub compute_sequence_statistics {
+ my ($seq) = @_;
+ my $symb = $seq->{'symb'};
+ my @Resources;
+ foreach my $res (@{$seq->{'contents'}}) {
+ next if ($res->{'type'} ne 'assessment');
+ push (@Resources,$res->{'symb'});
+ }
+ my ($starttime,$endtime) = &Apache::lonstathelpers::get_time_limits();
+ #
+ # First compute statistics based on student scores
+ my ($smin,$smax,$sMean,$sSTD,$scount,$sMAX) =
+ &Apache::loncoursedata::score_stats
+ (\@Apache::lonstatistics::SelectedSections,
+ $Apache::lonstatistics::enrollment_status,
+ \@Resources,$starttime,$endtime,undef);
+ $SeqStat{$symb}->{'title'} = $seq->{'title'};
+ $SeqStat{$symb}->{'scoremax'} = $smax;
+ $SeqStat{$symb}->{'scoremin'} = $smin;
+ $SeqStat{$symb}->{'scoremean'} = $sMean;
+ $SeqStat{$symb}->{'scorestd'} = $sSTD;
+ $SeqStat{$symb}->{'scorecount'} = $scount;
+ $SeqStat{$symb}->{'max_possible'} = $sMAX;
+ #
+ # Compute statistics based on the number of correct problems
+ # 'correct' is taken to mean
+ my ($cmin,$cmax,$cMean,$cSTD,$ccount)=
+ &Apache::loncoursedata::count_stats
+ (\@Apache::lonstatistics::SelectedSections,
+ $Apache::lonstatistics::enrollment_status,
+ \@Resources,$starttime,$endtime,undef);
+ my $K = $seq->{'num_assess_parts'};
+ my $kr_21;
+ if ($K > 1 && $cSTD > 0) {
+ $kr_21 = ($K/($K-1)) * (1 - $cMean*($K-$cMean)/($K*$cSTD**2));
+ } else {
+ $kr_21 = 'nan';
+ }
+ $SeqStat{$symb}->{'countmax'} = $cmax;
+ $SeqStat{$symb}->{'countmin'} = $cmin;
+ $SeqStat{$symb}->{'countstd'} = $cSTD;
+ $SeqStat{$symb}->{'count'} = $ccount;
+ $SeqStat{$symb}->{'items'} = $K;
+ $SeqStat{$symb}->{'KR-21'}=$kr_21;
+
+ return;
+}
+
+
=pod
@@ -1142,111 +1562,6 @@ Number of Students had at least one disc
=cut
-
-############################################################
-############################################################
-##
-## How this all works:
-## Statistics are computed by calling &get_statistics with the sequence,
-## resource, and part id to run statistics on. At various places within
-## the loops which compute the statistics, as well as before and after
-## the entire process, subroutines can be called. The subroutines are
-## registered to the following hooks:
-##
-## hook subroutine inputs
-## ----------------------------------------------------------
-## pre $r,$count
-## pre_seq $r,$count,$seq
-## pre_res $r,$count,$seq,$res
-## calc $r,$count,$seq,$res,$data
-## post_res $r,$count,$seq,$res
-## post_seq $r,$count,$seq
-## post $r,$count
-##
-## abort $r
-##
-## subroutines will be called in the order in which they are registered.
-##
-############################################################
-############################################################
-{
-
-my %hooks;
-my $aborted = 0;
-
-sub abort_computation {
- $aborted = 1;
-}
-
-sub clear_hooks {
- $aborted = 0;
- undef(%hooks);
-}
-
-sub register_hook {
- my ($hookname,$subref)=@_;
- if ($hookname !~ /^(pre|pre_seq|pre_res|post|post_seq|post_res|calc)$/){
- return;
- }
- if (ref($subref) ne 'CODE') {
- &Apache::lonnet::logthis('attempt to register hook to non-code: '.
- $hookname,' = '.$subref);
- } else {
- if (exists($hooks{$hookname})) {
- push(@{$hooks{$hookname}},$subref);
- } else {
- $hooks{$hookname} = [$subref];
- }
- }
- return;
-}
-
-sub run_hooks {
- my $context = shift();
- foreach my $hook (@{$hooks{$context}}) {
- if ($aborted && $context ne 'abort') {
- last;
- }
- my $retvalue = $hook->(@_);
- if (defined($retvalue) && $retvalue eq '0') {
- $aborted = 1 if (! $aborted);
- }
- }
-}
-
-sub run_statistics {
- my ($r) = @_;
- my $count = 0;
- &run_hooks('pre',$r,$count);
- foreach my $seq (&Apache::lonstatistics::Sequences_with_Assess()) {
- last if ($aborted);
- next if ($seq->{'num_assess'}<1);
- &run_hooks('pre_seq',$r,$count,$seq);
- foreach my $res (@{$seq->{'contents'}}) {
- last if ($aborted);
- next if ($res->{'type'} ne 'assessment');
- &run_hooks('pre_res',$r,$count,$seq,$res);
- foreach my $part (@{$res->{'parts'}}) {
- last if ($aborted);
- #
- # This is where all the work happens
- my $data = &get_statistics($seq,$res,$part,++$count);
- &run_hooks('calc',$r,$count,$seq,$res,$part,$data);
- }
- &run_hooks('post_res',$r,$count,$seq,$res);
- }
- &run_hooks('post_seq',$r,$count,$seq);
- }
- if ($aborted) {
- &run_hooks('abort',$r);
- } else {
- &run_hooks('post',$r,$count);
- }
- return;
-}
-
-} # End of %hooks scope
-
############################################################
############################################################