1: # The LearningOnline Network with CAPA
2: #
3: # $Id: lonproblemstatistics.pm,v 1.55 2003/07/28 15:30:46 matthew Exp $
4: #
5: # Copyright Michigan State University Board of Trustees
6: #
7: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
8: #
9: # LON-CAPA is free software; you can redistribute it and/or modify
10: # it under the terms of the GNU General Public License as published by
11: # the Free Software Foundation; either version 2 of the License, or
12: # (at your option) any later version.
13: #
14: # LON-CAPA is distributed in the hope that it will be useful,
15: # but WITHOUT ANY WARRANTY; without even the implied warranty of
16: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17: # GNU General Public License for more details.
18: #
19: # You should have received a copy of the GNU General Public License
20: # along with LON-CAPA; if not, write to the Free Software
21: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22: #
23: # /home/httpd/html/adm/gpl.txt
24: #
25: # http://www.lon-capa.org/
26: #
27: # (Navigate problems for statistical reports
28: #
29: ###############################################
30: ###############################################
31:
32: =pod
33:
34: =head1 NAME
35:
36: lonproblemstatistics
37:
38: =head1 SYNOPSIS
39:
40: Routines to present problem statistics to instructors via tables,
41: Excel files, and plots.
42:
43: =over 4
44:
45: =cut
46:
47: ###############################################
48: ###############################################
49:
50: package Apache::lonproblemstatistics;
51:
52: use strict;
53: use Apache::lonnet();
54: use Apache::lonhtmlcommon;
55: use Apache::loncoursedata;
56: use Apache::lonstatistics;
57: use Spreadsheet::WriteExcel;
58:
59: my @Fields = (
60: { name => 'problem_num',
61: title => 'P#',
62: align => 'right',
63: color => '#FFFFE6' },
64: { name => 'container',
65: title => 'Sequence or Folder',
66: align => 'left',
67: color => '#FFFFE6',
68: sortable => 'yes' },
69: { name => 'title',
70: title => 'Title',
71: align => 'left',
72: color => '#FFFFE6',
73: special => 'link',
74: sortable => 'yes', },
75: { name => 'part',
76: title => 'Part',
77: align => 'left',
78: color => '#FFFFE6',
79: },
80: { name => 'num_students',
81: title => '#Stdnts',
82: align => 'right',
83: color => '#EEFFCC',
84: format => '%d',
85: sortable => 'yes',
86: graphable => 'yes',
87: long_title => 'Number of Students Attempting Problem' },
88: { name => 'tries',
89: title => 'Tries',
90: align => 'right',
91: color => '#EEFFCC',
92: format => '%d',
93: sortable => 'yes',
94: graphable => 'yes',
95: long_title => 'Total Number of Tries' },
96: { name => 'max_tries',
97: title => 'Max Tries',
98: align => 'right',
99: color => '#DDFFFF',
100: format => '%d',
101: sortable => 'yes',
102: graphable => 'yes',
103: long_title => 'Maximum Number of Tries' },
104: { name => 'mean_tries',
105: title => 'Mean Tries',
106: align => 'right',
107: color => '#DDFFFF',
108: format => '%5.2f',
109: sortable => 'yes',
110: graphable => 'yes',
111: long_title => 'Average Number of Tries' },
112: { name => 'std_tries',
113: title => 'S.D. tries',
114: align => 'right',
115: color => '#DDFFFF',
116: format => '%5.2f',
117: sortable => 'yes',
118: graphable => 'yes',
119: long_title => 'Standard Deviation of Number of Tries' },
120: { name => 'skew_tries',
121: title => 'Skew Tries',
122: align => 'right',
123: color => '#DDFFFF',
124: format => '%5.2f',
125: sortable => 'yes',
126: graphable => 'yes',
127: long_title => 'Skew of Number of Tries' },
128: { name => 'deg_of_diff',
129: title => 'DoDiff',
130: align => 'right',
131: color => '#DDFFFF',
132: format => '%5.2f',
133: sortable => 'yes',
134: graphable => 'yes',
135: long_title => 'Degree of Difficulty'.
136: '[ 1 - ((#YES+#yes) / Tries) ]'},
137: { name => 'num_solved',
138: title => '#YES',
139: align => 'right',
140: color => '#FFDDDD',
141: format => '%d',
142: sortable => 'yes',
143: graphable => 'yes',
144: long_title => 'Number of Students able to Solve' },
145: { name => 'num_override',
146: title => '#yes',
147: align => 'right',
148: color => '#FFDDDD',
149: format => '%d',
150: sortable => 'yes',
151: graphable => 'yes',
152: long_title => 'Number of Students given Override' },
153: { name => 'per_wrong',
154: title => '%Wrng',
155: align => 'right',
156: color => '#FFFFE6',
157: format => '%4.1f',
158: sortable => 'yes',
159: graphable => 'yes',
160: long_title => 'Percent of students whose final answer is wrong' },
161: );
162:
163: ###############################################
164: ###############################################
165:
166: =pod
167:
168: =item &CreateInterface()
169:
170: Create the main intereface for the statistics page. Allows the user to
171: select sections, maps, and output.
172:
173: =cut
174:
175: ###############################################
176: ###############################################
177: sub CreateInterface {
178: my $Str = '';
179: $Str .= '<table cellspacing="5">'."\n";
180: $Str .= '<tr>';
181: $Str .= '<td align="center"><b>Sections</b></td>';
182: $Str .= '<td align="center"><b>Enrollment Status</b></td>';
183: $Str .= '<td align="center"><b>Sequences and Folders</b></td>';
184: $Str .= '<td align="center"><b>Output</b></td>';
185: $Str .= '</tr>'."\n";
186: #
187: $Str .= '<tr><td align="center">'."\n";
188: $Str .= &Apache::lonstatistics::SectionSelect('Section','multiple',5);
189: $Str .= '</td><td align="center">';
190: $Str .= &Apache::lonhtmlcommon::StatusOptions(undef,undef,5);
191: $Str .= '</td><td align="center">';
192: #
193: my $only_seq_with_assessments = sub {
194: my $s=shift;
195: if ($s->{'num_assess'} < 1) {
196: return 0;
197: } else {
198: return 1;
199: }
200: };
201: $Str .= &Apache::lonstatistics::MapSelect('Maps','multiple,all',5,
202: $only_seq_with_assessments);
203: $Str .= '</td><td>'."\n";
204: $Str .= &CreateAndParseOutputSelector();
205: $Str .= '</td></tr>'."\n";
206: $Str .= '</table>'."\n";
207: $Str .= '<input type="submit" value="Generate Statistics" />';
208: $Str .= ' 'x5;
209: $Str .= '<input type="submit" name="ClearCache" value="Clear Caches" />';
210: $Str .= ' 'x5;
211: return $Str;
212: }
213:
214: #######################################################
215: #######################################################
216:
217: =pod
218:
219: =item &CreateAndParseOutputSelector()
220:
221: Construct a selection list of options for output and parse output selections.
222: The current output selected is indicated by the values of the two package
223: variables $output_mode and $show. @OutputOptions holds the descriptions of
224: the output options and the values for $output_mode and $show.
225:
226: Based on code from lonstudentassessment.pm.
227:
228: =cut
229:
230: #######################################################
231: #######################################################
232: my $output_mode;
233: my $show;
234:
235: my @OutputOptions =
236: (
237: { name => 'problem statistics grouped by sequence',
238: value => 'HTML problem statistics grouped',
239: description => 'Output statistics for the problem parts.',
240: mode => 'html',
241: show => 'grouped',
242: },
243: { name => 'problem statistics ungrouped',
244: value => 'HTML problem statistics ungrouped',
245: description => 'Output statistics for the problem parts.',
246: mode => 'html',
247: show => 'ungrouped',
248: },
249: { name => 'problem statistics, Excel',
250: value => 'Excel problem statistics',
251: description => 'Output statistics for the problem parts '.
252: 'in an Excel workbook',
253: mode => 'excel',
254: show => 'all',
255: },
256: );
257:
258: sub OutputDescriptions {
259: my $Str = '';
260: $Str .= "<h2>Output Modes</h2>\n";
261: $Str .= "<dl>\n";
262: foreach my $outputmode (@OutputOptions) {
263: $Str .=" <dt>".$outputmode->{'name'}."</dt>\n";
264: $Str .=" <dd>".$outputmode->{'description'}."</dd>\n";
265: }
266: $Str .= "</dl>\n";
267: return $Str;
268: }
269:
270: sub CreateAndParseOutputSelector {
271: my $Str = '';
272: my $elementname = 'statsoutputmode';
273: #
274: # Format for output options is 'mode, restrictions';
275: my $selected = 'HTML problem statistics grouped';
276: if (exists($ENV{'form.'.$elementname})) {
277: if (ref($ENV{'form.'.$elementname} eq 'ARRAY')) {
278: $selected = $ENV{'form.'.$elementname}->[0];
279: } else {
280: $selected = $ENV{'form.'.$elementname};
281: }
282: }
283: #
284: # Set package variables describing output mode
285: $output_mode = 'html';
286: $show = 'all';
287: foreach my $option (@OutputOptions) {
288: next if ($option->{'value'} ne $selected);
289: $output_mode = $option->{'mode'};
290: $show = $option->{'show'};
291: }
292: #
293: # Build the form element
294: $Str = qq/<select size="5" name="$elementname">/;
295: foreach my $option (@OutputOptions) {
296: if (exists($option->{'special'}) &&
297: $option->{'special'} =~ /do not show/) {
298: next;
299: }
300: $Str .= "\n".' <option value="'.$option->{'value'}.'"';
301: $Str .= " selected " if ($option->{'value'} eq $selected);
302: $Str .= ">".$option->{'name'}."<\/option>";
303: }
304: $Str .= "\n</select>";
305: return $Str;
306: }
307:
308: ###############################################
309: ###############################################
310:
311: =pod
312:
313: =item &Gather_Student_Data()
314:
315: Ensures all student data is up to date.
316:
317: =cut
318:
319: ###############################################
320: ###############################################
321: sub Gather_Student_Data {
322: my ($r) = @_;
323: my $c = $r->connection();
324: #
325: my @Sequences = &Apache::lonstatistics::Sequences_with_Assess();
326: #
327: my @Students = @Apache::lonstatistics::Students;
328: #
329: # Open the progress window
330: my %prog_state=&Apache::lonhtmlcommon::Create_PrgWin
331: ($r,'Statistics Compilation Status',
332: 'Statistics Compilation Progress', scalar(@Students));
333: #
334: while (my $student = shift @Students) {
335: return if ($c->aborted());
336: my ($status,undef) = &Apache::loncoursedata::ensure_current_data
337: ($student->{'username'},$student->{'domain'},
338: $ENV{'request.course.id'});
339: &Apache::lonhtmlcommon::Increment_PrgWin($r,\%prog_state,
340: 'last student');
341: }
342: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
343: $r->rflush();
344: }
345:
346: ###############################################
347: ###############################################
348:
349: =pod
350:
351: =item &BuildProblemStatisticsPage()
352:
353: Main interface to problem statistics.
354:
355: =cut
356:
357: ###############################################
358: ###############################################
359: sub BuildProblemStatisticsPage {
360: my ($r,$c)=@_;
361: #
362: $output_mode = 'html';
363: $show = 'grouped';
364: #
365: $r->print(&CreateInterface());
366: $r->print('<input type="hidden" name="statsfirstcall" value="no" />');
367: $r->print('<input type="hidden" name="sortby" value="'.$ENV{'form.sortby'}.
368: '" />');
369: $r->print('<input type="hidden" name="plot" value="" />');
370: if (! exists($ENV{'form.statsfirstcall'})) {
371: return;
372: }
373: #
374: &Gather_Student_Data($r);
375: #
376: #
377: if ($output_mode eq 'html') {
378: $r->print("<h2>".
379: $ENV{'course.'.$ENV{'request.course.id'}.'.description'}.
380: "</h2>\n");
381: $r->print("<h3>".localtime(time)."</h3>");
382: $r->rflush();
383: if ($show eq 'grouped') {
384: &output_html_grouped_by_sequence($r);
385: } elsif ($show eq 'ungrouped') {
386: &output_html_ungrouped($r);
387: }
388: } elsif ($output_mode eq 'excel') {
389: $r->print("<h2>Preparing Excel Spreadsheet</h2>");
390: &output_excel($r);
391: } else {
392: $r->print("<h1>Not implemented</h1>");
393: }
394: return;
395: }
396:
397: ###############################################
398: ###############################################
399:
400: =pod
401:
402: =item &output_html_grouped_by_sequence()
403:
404: Presents the statistics data as an html table organized by the order
405: the assessments appear in the course.
406:
407: =cut
408:
409: ###############################################
410: ###############################################
411: sub output_html_grouped_by_sequence {
412: my ($r) = @_;
413: my $problem_num = 0;
414: #$r->print(&ProblemStatisticsLegend());
415: foreach my $sequence (&Apache::lonstatistics::Sequences_with_Assess()) {
416: next if ($sequence->{'num_assess'}<1);
417: $r->print("<h3>".$sequence->{'title'}."</h3>");
418: $r->print('<table border="0"><tr><td bgcolor="#777777">'."\n");
419: $r->print('<table border="0" cellpadding="3">'."\n");
420: $r->print('<tr bgcolor="#FFFFE6">');
421: my $Str = &statistics_table_header('no container no plots');
422: $r->print('<tr bgcolor="#FFFFE6">'.$Str."</tr>\n");
423: foreach my $resource (@{$sequence->{'contents'}}) {
424: next if ($resource->{'type'} ne 'assessment');
425: foreach my $part (@{$resource->{'parts'}}) {
426: $problem_num++;
427: my $data = &get_statistics($sequence,$resource,$part,
428: $problem_num);
429: my $option = '';
430: $r->print('<tr>'.&statistics_html_table_data($data,
431: 'no container').
432: "</tr>\n");
433: }
434: }
435: $r->print("</table>\n");
436: $r->print("</td></tr></table>\n");
437: $r->rflush();
438: }
439: #
440: return;
441: }
442:
443: ###############################################
444: ###############################################
445:
446: =pod
447:
448: =item &output_html_ungrouped()
449:
450: Presents the statistics data in a single html table which can be sorted by
451: different columns.
452:
453: =cut
454:
455: ###############################################
456: ###############################################
457: sub output_html_ungrouped {
458: my ($r,$option) = @_;
459: #
460: if (exists($ENV{'form.plot'}) && $ENV{'form.plot'} ne '') {
461: &plot_statistics($r,$ENV{'form.plot'});
462: }
463: #
464: my $problem_num = 0;
465: my $show_container = 0;
466: my $show_part = 0;
467: #$r->print(&ProblemStatisticsLegend());
468: my $sortby = undef;
469: foreach my $field (@Fields) {
470: if ($ENV{'form.sortby'} eq $field->{'name'}) {
471: $sortby = $field->{'name'};
472: }
473: }
474: if (! defined($sortby) || $sortby eq '' || $sortby eq 'problem_num') {
475: $sortby = 'container';
476: }
477: # If there is more than one sequence, list their titles
478: my @Sequences = &Apache::lonstatistics::Sequences_with_Assess();
479: if (@Sequences < 1) {
480: $option .= ' no container';
481: }
482: #
483: # Compile the data
484: my @Statsarray;
485: foreach my $sequence (@Sequences) {
486: next if ($sequence->{'num_assess'}<1);
487: foreach my $resource (@{$sequence->{'contents'}}) {
488: next if ($resource->{'type'} ne 'assessment');
489: foreach my $part (@{$resource->{'parts'}}) {
490: $problem_num++;
491: my $data = &get_statistics($sequence,$resource,$part,
492: $problem_num);
493: $show_part = 1 if ($part ne '0');
494: #
495: push (@Statsarray,$data);
496: }
497: }
498: }
499: #
500: # Sort the data
501: my @OutputOrder;
502: if ($sortby eq 'container') {
503: @OutputOrder = @Statsarray;
504: } else {
505: # $sortby is already defined, so we can charge ahead
506: if ($sortby =~ /^(title|part)$/i) {
507: # Alpha comparison
508: @OutputOrder = sort {
509: lc($a->{$sortby}) cmp lc($b->{$sortby}) ||
510: lc($a->{'title'}) cmp lc($b->{'title'}) ||
511: lc($a->{'part'}) cmp lc($b->{'part'});
512: } @Statsarray;
513: } else {
514: # Numerical comparison
515: @OutputOrder = sort {
516: my $retvalue = 0;
517: if ($b->{$sortby} eq 'nan') {
518: if ($a->{$sortby} ne 'nan') {
519: $retvalue = -1;
520: } else {
521: $retvalue = 0;
522: }
523: }
524: if ($a->{$sortby} eq 'nan') {
525: if ($b->{$sortby} ne 'nan') {
526: $retvalue = 1;
527: }
528: }
529: if ($retvalue eq '0') {
530: $retvalue = $b->{$sortby} <=> $a->{$sortby} ||
531: lc($a->{'title'}) <=> lc($b->{'title'}) ||
532: lc($a->{'part'}) <=> lc($b->{'part'});
533: }
534: $retvalue;
535: } @Statsarray;
536: }
537: }
538: $option .= 'no part' if (! $show_part);
539: my $num_output = 0;
540: #
541: # output the headers
542: $r->print('<table border="0"><tr><td bgcolor="#777777">'."\n");
543: $r->print('<table border="0" cellpadding="3">'."\n");
544: my $Str = &statistics_table_header($option.' sortable');
545: $r->print('<tr bgcolor="#FFFFE6">'.$Str."</tr>\n");
546: #
547: foreach my $rowdata (@OutputOrder) {
548: $num_output++;
549: if ($num_output % 25 == 0) {
550: $r->print("</table>\n</td></tr></table>\n");
551: #
552: $r->print('<table border="0"><tr><td bgcolor="#777777">'."\n");
553: $r->print('<table border="0" cellpadding="3">'."\n");
554: my $Str = &statistics_table_header($option.' sortable');
555: $r->print('<tr bgcolor="#FFFFE6">'.$Str."</tr>\n");
556: $r->rflush();
557: }
558: $r->print('<tr>'.&statistics_html_table_data($rowdata,$option).
559: "</tr>\n");
560: }
561: $r->print("</table>\n");
562: $r->print("</td></tr></table>\n");
563: $r->rflush();
564: #
565: return;
566: }
567:
568: ###############################################
569: ###############################################
570:
571: =pod
572:
573: =item &output_excel()
574:
575: Presents the statistical data in an Excel 95 compatable spreadsheet file.
576:
577: =cut
578:
579: ###############################################
580: ###############################################
581: sub output_excel {
582: my ($r) = @_;
583: my $filename = '/prtspool/'.
584: $ENV{'user.name'}.'_'.$ENV{'user.domain'}.'_'.
585: time.'_'.rand(1000000000).'.xls';
586: #
587: my $excel_workbook = undef;
588: my $excel_sheet = undef;
589: #
590: my $rows_output = 0;
591: my $cols_output = 0;
592: #
593: # Create sheet
594: $excel_workbook = Spreadsheet::WriteExcel->new('/home/httpd'.$filename);
595: #
596: # Check for errors
597: if (! defined($excel_workbook)) {
598: $r->log_error("Error creating excel spreadsheet $filename: $!");
599: $r->print("Problems creating new Excel file. ".
600: "This error has been logged. ".
601: "Please alert your LON-CAPA administrator");
602: return ;
603: }
604: #
605: # The excel spreadsheet stores temporary data in files, then put them
606: # together. If needed we should be able to disable this (memory only).
607: # The temporary directory must be specified before calling 'addworksheet'.
608: # File::Temp is used to determine the temporary directory.
609: $excel_workbook->set_tempdir($Apache::lonnet::tmpdir);
610: #
611: # Add a worksheet
612: my $sheetname = $ENV{'course.'.$ENV{'request.course.id'}.'.description'};
613: if (length($sheetname) > 31) {
614: $sheetname = substr($sheetname,0,31);
615: }
616: $excel_sheet = $excel_workbook->addworksheet($sheetname);
617: #
618: # Put the course description in the header
619: $excel_sheet->write($rows_output,$cols_output++,
620: $ENV{'course.'.$ENV{'request.course.id'}.'.description'});
621: $cols_output += 3;
622: #
623: # Put a description of the sections listed
624: my $sectionstring = '';
625: my @Sections = @Apache::lonstatistics::SelectedSections;
626: if (scalar(@Sections) > 1) {
627: if (scalar(@Sections) > 2) {
628: my $last = pop(@Sections);
629: $sectionstring = "Sections ".join(', ',@Sections).', and '.$last;
630: } else {
631: $sectionstring = "Sections ".join(' and ',@Sections);
632: }
633: } else {
634: if ($Sections[0] eq 'all') {
635: $sectionstring = "All sections";
636: } else {
637: $sectionstring = "Section ".$Sections[0];
638: }
639: }
640: $excel_sheet->write($rows_output,$cols_output++,$sectionstring);
641: $cols_output += scalar(@Sections);
642: #
643: # Put the date in there too
644: $excel_sheet->write($rows_output,$cols_output++,
645: 'Compiled on '.localtime(time));
646: #
647: $rows_output++;
648: $cols_output=0;
649: #
650: # Long Headersheaders
651: foreach my $field (@Fields) {
652: next if ($field->{'name'} eq 'problem_num');
653: if (exists($field->{'long_title'})) {
654: $excel_sheet->write($rows_output,$cols_output++,
655: $field->{'long_title'});
656: } else {
657: $excel_sheet->write($rows_output,$cols_output++,'');
658: }
659: }
660: $rows_output++;
661: $cols_output=0;
662: # Brief headers
663: foreach my $field (@Fields) {
664: next if ($field->{'name'} eq 'problem_num');
665: $excel_sheet->write($rows_output,$cols_output++,$field->{'title'});
666: }
667: $rows_output++;
668: #
669: # Write the data
670: my $problem_num=0;
671: foreach my $sequence (&Apache::lonstatistics::Sequences_with_Assess()) {
672: next if ($sequence->{'num_assess'}<1);
673: foreach my $resource (@{$sequence->{'contents'}}) {
674: next if ($resource->{'type'} ne 'assessment');
675: foreach my $part (@{$resource->{'parts'}}) {
676: $cols_output=0;
677: $problem_num++;
678: my $data = &get_statistics($sequence,$resource,$part,
679: $problem_num);
680: #
681: if (!defined($part) || $part eq '') {
682: $part = ' ';
683: }
684: foreach my $field (@Fields) {
685: next if ($field->{'name'} eq 'problem_num');
686: $excel_sheet->write($rows_output,$cols_output++,
687: $data->{$field->{'name'}});
688: }
689: $rows_output++;
690: }
691: }
692: }
693: #
694: # Write the excel file
695: $excel_workbook->close();
696: # Tell the user where to get their excel file
697: $r->print('<br />'.
698: '<a href="'.$filename.'">Your Excel spreadsheet.</a>'."\n");
699: $r->rflush();
700: return;
701: }
702:
703: ###############################################
704: ###############################################
705:
706: =pod
707:
708: =item &statistics_html_table_data()
709:
710: Help function used to format the rows for HTML table output.
711:
712: =cut
713:
714: ###############################################
715: ###############################################
716: sub statistics_html_table_data {
717: my ($data,$options) = @_;
718: my $row = '';
719: foreach my $field (@Fields) {
720: next if ($options =~ /no $field->{'name'}/);
721: $row .= '<td bgcolor="'.$field->{'color'}.'"';
722: if (exists($field->{'align'})) {
723: $row .= ' align="'.$field->{'align'}.'"';
724: }
725: $row .= '>';
726: if (exists($field->{'special'}) && $field->{'special'} eq 'link') {
727: $row .= '<a href="'.$data->{$field->{'name'}.'.link'}.'">';
728: }
729: if (exists($field->{'format'})) {
730: $row .= sprintf($field->{'format'},$data->{$field->{'name'}});
731: } else {
732: $row .= $data->{$field->{'name'}};
733: }
734: if (exists($field->{'special'}) && $field->{'special'} eq 'link') {
735: $row.= '</a>';
736: }
737: $row .= '</td>';
738: }
739: return $row;
740: }
741:
742: sub statistics_table_header {
743: my ($options) = @_;
744: my $header_row;
745: foreach my $field (@Fields) {
746: next if ($options =~ /no $field->{'name'}/);
747: $header_row .= '<th>';
748: if ($options =~ /sortable/ &&
749: exists($field->{'sortable'}) && $field->{'sortable'} eq 'yes') {
750: $header_row .= '<a href="javascript:'.
751: 'document.Statistics.sortby.value='."'".$field->{'name'}."'".
752: ';document.Statistics.submit();">';
753: }
754: $header_row .= $field->{'title'};
755: if ($options =~ /sortable/) {
756: $header_row.= '</a>';
757: }
758: if ($options !~ /no plots/ &&
759: exists($field->{'graphable'}) &&
760: $field->{'graphable'} eq 'yes') {
761: $header_row.=' (';
762: $header_row .= '<a href="javascript:'.
763: "document.Statistics.plot.value='$field->{'name'}'".
764: ';document.Statistics.submit();">';
765: $header_row .= 'plot</a>)';
766: }
767: $header_row .= '</th>';
768: }
769: return $header_row;
770: }
771:
772: ###############################################
773: ###############################################
774:
775: =pod
776:
777: =item &plot_statistics()
778:
779: =cut
780:
781: ###############################################
782: ###############################################
783: sub plot_statistics {
784: my ($r,$datafield) = @_;
785: my @Data;
786: #
787: #
788: my $sortfield = undef;
789: my $title = undef;
790: foreach my $field (@Fields) {
791: if ($datafield eq $field->{'name'} &&
792: exists($field->{'graphable'}) && $field->{'graphable'} eq 'yes') {
793: $sortfield = $field->{'name'};
794: $title = $field->{'long_title'};
795: }
796: }
797: return if (! defined($sortfield) || $sortfield eq '');
798: #
799: my $Max = 0;
800: my $problem_num = 0;
801: foreach my $sequence (&Apache::lonstatistics::Sequences_with_Assess()) {
802: next if ($sequence->{'num_assess'}<1);
803: foreach my $resource (@{$sequence->{'contents'}}) {
804: next if ($resource->{'type'} ne 'assessment');
805: foreach my $part (@{$resource->{'parts'}}) {
806: my $problem_number++;
807: my $data = &get_statistics($sequence,$resource,$part,
808: $problem_num);
809: my $value = $data->{$sortfield};
810: $Max = $value if ($Max < $value);
811: push (@Data,$value);
812: }
813: }
814: }
815: #
816: # Print out plot request
817: my $yaxis = '';
818: if ($sortfield eq 'per_wrong') {
819: $yaxis = 'Percent';
820: }
821: #
822: # Determine appropriate value for $Max
823: if ($sortfield eq 'deg_of_diff') {
824: if ($Max > 0.5) {
825: $Max = 1;
826: } elsif ($Max > 0.2) {
827: $Max = 0.5;
828: } elsif ($Max > 0.1) {
829: $Max = 0.2;
830: }
831: } elsif ($sortfield eq 'per_wrong') {
832: if ($Max > 50) {
833: $Max = 100;
834: } elsif ($Max > 25) {
835: $Max = 50;
836: } elsif ($Max > 20) {
837: $Max = 25;
838: } elsif ($Max > 10) {
839: $Max = 20;
840: } elsif ($Max > 5) {
841: $Max = 10;
842: } else {
843: $Max = 5;
844: }
845: }
846:
847: $r->print("<p>".&DrawGraph(\@Data,$title,'Problem Number',$yaxis,
848: $Max)."</p>\n");
849: #
850: # Print out the data
851: $ENV{'form.sortby'} = 'Contents';
852: # &output_html_ungrouped($r);
853: return;
854: }
855:
856: ###############################################
857: ###############################################
858:
859: =pod
860:
861: =item &DrawGraph()
862:
863: =cut
864:
865: ###############################################
866: ###############################################
867: sub DrawGraph {
868: my ($values,$title,$xaxis,$yaxis,$Max)=@_;
869: $title = '' if (! defined($title));
870: $xaxis = '' if (! defined($xaxis));
871: $yaxis = '' if (! defined($yaxis));
872: #
873: my $sendValues = join(',', @$values);
874: my $sendCount = scalar(@$values);
875: $Max =1 if ($Max < 1);
876: if ( int($Max) < $Max ) {
877: $Max++;
878: $Max = int($Max);
879: }
880: my @GData = ($title,$xaxis,$yaxis,$Max,$sendCount,$sendValues);
881: return '<IMG src="/cgi-bin/graph.png?'.
882: (join('&', @GData)).'" border="1" />';
883: }
884:
885: sub get_statistics {
886: my ($sequence,$resource,$part,$problem_num) = @_;
887: #
888: my $symb = $resource->{'symb'};
889: my $courseid = $ENV{'request.course.id'};
890: #
891: my $students = \@Apache::lonstatistics::Students;
892: if ($Apache::lonstatistics::SelectedSections[0] eq 'all') {
893: $students = undef;
894: }
895: my $data = &Apache::loncoursedata::get_problem_statistics
896: ($students,$symb,$part,$courseid);
897: $data->{'part'} = $part;
898: $data->{'problem_num'} = $problem_num;
899: $data->{'container'} = $sequence->{'title'};
900: $data->{'title'} = $resource->{'title'};
901: $data->{'title.link'} = $resource->{'src'}.'?symb='.
902: &Apache::lonnet::escape($resource->{'symb'});
903: #
904: return $data;
905: }
906:
907: ###############################################
908: ###############################################
909:
910: =pod
911:
912: =item &ProblemStatisticsLegend()
913:
914: =cut
915:
916: ###############################################
917: ###############################################
918: sub ProblemStatisticsLegend {
919: my $Ptr = '';
920: $Ptr = '<table border="0">';
921: $Ptr .= '<tr><td>';
922: $Ptr .= '<b>#Stdnts</b></td>';
923: $Ptr .= '<td>Total number of students attempted the problem.';
924: $Ptr .= '</td></tr><tr><td>';
925: $Ptr .= '<b>Tries</b></td>';
926: $Ptr .= '<td>Total number of tries for solving the problem.';
927: $Ptr .= '</td></tr><tr><td>';
928: $Ptr .= '<b>Max Tries</b></td>';
929: $Ptr .= '<td>Largest number of tries for solving the problem by a student.';
930: $Ptr .= '</td></tr><tr><td>';
931: $Ptr .= '<b>Mean</b></td>';
932: $Ptr .= '<td>Average number of tries. [ Tries / #Stdnts ]';
933: $Ptr .= '</td></tr><tr><td>';
934: $Ptr .= '<b>#YES</b></td>';
935: $Ptr .= '<td>Number of students solved the problem correctly.';
936: $Ptr .= '</td></tr><tr><td>';
937: $Ptr .= '<b>#yes</b></td>';
938: $Ptr .= '<td>Number of students solved the problem by override.';
939: $Ptr .= '</td></tr><tr><td>';
940: $Ptr .= '<b>%Wrong</b></td>';
941: $Ptr .= '<td>Percentage of students who tried to solve the problem ';
942: $Ptr .= 'but is still incorrect. [ 100*((#Stdnts-(#YES+#yes))/#Stdnts) ]';
943: $Ptr .= '</td></tr><tr><td>';
944: $Ptr .= '<b>DoDiff</b></td>';
945: $Ptr .= '<td>Degree of Difficulty of the problem. ';
946: $Ptr .= '[ 1 - ((#YES+#yes) / Tries) ]';
947: $Ptr .= '</td></tr><tr><td>';
948: $Ptr .= '<b>S.D.</b></td>';
949: $Ptr .= '<td>Standard Deviation of the tries. ';
950: $Ptr .= '[ sqrt(sum((Xi - Mean)^2)) / (#Stdnts-1) ';
951: $Ptr .= 'where Xi denotes every student\'s tries ]';
952: $Ptr .= '</td></tr><tr><td>';
953: $Ptr .= '<b>Skew.</b></td>';
954: $Ptr .= '<td>Skewness of the students tries.';
955: $Ptr .= '[(sqrt( sum((Xi - Mean)^3) / #Stdnts)) / (S.D.^3)]';
956: $Ptr .= '</td></tr><tr><td>';
957: $Ptr .= '<b>Dis.F.</b></td>';
958: $Ptr .= '<td>Discrimination Factor: A Standard for evaluating the ';
959: $Ptr .= 'problem according to a Criterion<br>';
960: $Ptr .= '<b>[Criterion to group students into %27 Upper Students - ';
961: $Ptr .= 'and %27 Lower Students]</b><br>';
962: $Ptr .= '<b>1st Criterion</b> for Sorting the Students: ';
963: $Ptr .= '<b>Sum of Partial Credit Awarded / Total Number of Tries</b><br>';
964: $Ptr .= '<b>2nd Criterion</b> for Sorting the Students: ';
965: $Ptr .= '<b>Total number of Correct Answers / Total Number of Tries</b>';
966: $Ptr .= '</td></tr>';
967: $Ptr .= '<tr><td><b>Disc.</b></td>';
968: $Ptr .= '<td>Number of Students had at least one discussion.';
969: $Ptr .= '</td></tr></table>';
970: return $Ptr;
971: }
972:
973: #---- END Problem Statistics Web Page ----------------------------------------
974:
975: 1;
976: __END__
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