1: # The LearningOnline Network with CAPA
2: #
3: # $Id: lonproblemstatistics.pm,v 1.59 2003/09/29 16:20:18 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 Apache::lonlocal;
58: use Spreadsheet::WriteExcel;
59:
60: ##
61: ## Localization notes:
62: ##
63: ## in @Fields[0]->{'long_title'} is placed in Excel files and is used as the
64: ## header for plots created with Graph.pm, both of which more than likely do
65: ## not support localization.
66: ##
67: my @Fields = (
68: { name => 'problem_num',
69: title => 'P#',
70: align => 'right',
71: color => '#FFFFE6' },
72: { name => 'container',
73: title => 'Sequence or Folder',
74: align => 'left',
75: color => '#FFFFE6',
76: sortable => 'yes' },
77: { name => 'title',
78: title => 'Title',
79: align => 'left',
80: color => '#FFFFE6',
81: special => 'link',
82: sortable => 'yes', },
83: { name => 'part',
84: title => 'Part',
85: align => 'left',
86: color => '#FFFFE6',
87: },
88: { name => 'num_students',
89: title => '#Stdnts',
90: align => 'right',
91: color => '#EEFFCC',
92: format => '%d',
93: sortable => 'yes',
94: graphable => 'yes',
95: long_title => 'Number of Students Attempting Problem' },
96: { name => 'tries',
97: title => 'Tries',
98: align => 'right',
99: color => '#EEFFCC',
100: format => '%d',
101: sortable => 'yes',
102: graphable => 'yes',
103: long_title => 'Total Number of Tries' },
104: { name => 'max_tries',
105: title => 'Max Tries',
106: align => 'right',
107: color => '#DDFFFF',
108: format => '%d',
109: sortable => 'yes',
110: graphable => 'yes',
111: long_title => 'Maximum Number of Tries' },
112: { name => 'mean_tries',
113: title => 'Mean Tries',
114: align => 'right',
115: color => '#DDFFFF',
116: format => '%5.2f',
117: sortable => 'yes',
118: graphable => 'yes',
119: long_title => 'Average Number of Tries' },
120: { name => 'std_tries',
121: title => 'S.D. tries',
122: align => 'right',
123: color => '#DDFFFF',
124: format => '%5.2f',
125: sortable => 'yes',
126: graphable => 'yes',
127: long_title => 'Standard Deviation of Number of Tries' },
128: { name => 'skew_tries',
129: title => 'Skew Tries',
130: align => 'right',
131: color => '#DDFFFF',
132: format => '%5.2f',
133: sortable => 'yes',
134: graphable => 'yes',
135: long_title => 'Skew of Number of Tries' },
136: { name => 'deg_of_diff',
137: title => 'DoDiff',
138: align => 'right',
139: color => '#DDFFFF',
140: format => '%5.2f',
141: sortable => 'yes',
142: graphable => 'yes',
143: long_title => 'Degree of Difficulty'.
144: '[ 1 - ((#YES+#yes) / Tries) ]'},
145: { name => 'num_solved',
146: title => '#YES',
147: align => 'right',
148: color => '#FFDDDD',
149: format => '%d',
150: sortable => 'yes',
151: graphable => 'yes',
152: long_title => 'Number of Students able to Solve' },
153: { name => 'num_override',
154: title => '#yes',
155: align => 'right',
156: color => '#FFDDDD',
157: format => '%d',
158: sortable => 'yes',
159: graphable => 'yes',
160: long_title => 'Number of Students given Override' },
161: { name => 'per_wrong',
162: title => '%Wrng',
163: align => 'right',
164: color => '#FFFFE6',
165: format => '%4.1f',
166: sortable => 'yes',
167: graphable => 'yes',
168: long_title => 'Percent of students whose final answer is wrong' },
169: );
170:
171: ###############################################
172: ###############################################
173:
174: =pod
175:
176: =item &CreateInterface()
177:
178: Create the main intereface for the statistics page. Allows the user to
179: select sections, maps, and output.
180:
181: =cut
182:
183: ###############################################
184: ###############################################
185: my @OutputOptions =
186: (
187: { name => 'problem statistics grouped by sequence',
188: value => 'HTML problem statistics grouped',
189: description => 'Output statistics for the problem parts.',
190: mode => 'html',
191: show => 'grouped',
192: },
193: { name => 'problem statistics ungrouped',
194: value => 'HTML problem statistics ungrouped',
195: description => 'Output statistics for the problem parts.',
196: mode => 'html',
197: show => 'ungrouped',
198: },
199: { name => 'problem statistics, Excel',
200: value => 'Excel problem statistics',
201: description => 'Output statistics for the problem parts '.
202: 'in an Excel workbook',
203: mode => 'excel',
204: show => 'all',
205: },
206: );
207:
208: sub CreateInterface {
209: my $Str = '';
210: $Str .= '<table cellspacing="5">'."\n";
211: $Str .= '<tr>';
212: $Str .= '<td align="center"><b>'.&mt('Sections').'</b></td>';
213: $Str .= '<td align="center"><b>'.&mt('Enrollment Status').'</b></td>';
214: $Str .= '<td align="center"><b>'.&mt('Sequences and Folders').'</b></td>';
215: $Str .= '<td align="center"><b>'.&mt('Output').'</b></td>';
216: $Str .= '</tr>'."\n";
217: #
218: $Str .= '<tr><td align="center">'."\n";
219: $Str .= &Apache::lonstatistics::SectionSelect('Section','multiple',5);
220: $Str .= '</td><td align="center">';
221: $Str .= &Apache::lonhtmlcommon::StatusOptions(undef,undef,5);
222: $Str .= '</td><td align="center">';
223: #
224: my $only_seq_with_assessments = sub {
225: my $s=shift;
226: if ($s->{'num_assess'} < 1) {
227: return 0;
228: } else {
229: return 1;
230: }
231: };
232: $Str .= &Apache::lonstatistics::MapSelect('Maps','multiple,all',5,
233: $only_seq_with_assessments);
234: $Str .= '</td><td>'."\n";
235: my ($html,$outputmode,$show) =
236: &Apache::lonstatistics::CreateAndParseOutputSelector(
237: 'statsoutputmode',
238: 'HTML problem statistics grouped',
239: @OutputOptions);
240: $Str .= $html;
241: $Str .= '</td></tr>'."\n";
242: $Str .= '</table>'."\n";
243: $Str .= '<input type="submit" name="GenerateStatistics" value="'.
244: &mt('Generate Statistics').'" />';
245: $Str .= ' 'x5;
246: $Str .= '<input type="submit" name="ClearCache" value="'.
247: &mt('Clear Caches').'" />';
248: $Str .= ' 'x5;
249: return ($Str,$outputmode,$show);
250: }
251:
252: ###############################################
253: ###############################################
254:
255: =pod
256:
257: =item &BuildProblemStatisticsPage()
258:
259: Main interface to problem statistics.
260:
261: =cut
262:
263: ###############################################
264: ###############################################
265: sub BuildProblemStatisticsPage {
266: my ($r,$c)=@_;
267: #
268: my ($interface,$output_mode,$show) = &CreateInterface();
269: $r->print($interface);
270: $r->print('<input type="hidden" name="statsfirstcall" value="no" />');
271: $r->print('<input type="hidden" name="sortby" value="'.$ENV{'form.sortby'}.
272: '" />');
273: $r->print('<input type="hidden" name="plot" value="" />');
274: if (! exists($ENV{'form.statsfirstcall'})) {
275: return;
276: }
277: #
278: &Apache::lonstatistics::Gather_Student_Data($r);
279: #
280: #
281: if ($output_mode eq 'html') {
282: $r->print("<h2>".
283: $ENV{'course.'.$ENV{'request.course.id'}.'.description'}.
284: "</h2>\n");
285: $r->print("<h3>".localtime(time)."</h3>");
286: $r->rflush();
287: if ($show eq 'grouped') {
288: &output_html_grouped_by_sequence($r);
289: } elsif ($show eq 'ungrouped') {
290: &output_html_ungrouped($r);
291: }
292: } elsif ($output_mode eq 'excel') {
293: $r->print('<h2>'.&mt('Preparing Excel Spreadsheet').'</h2>');
294: &output_excel($r);
295: } else {
296: $r->print('<h1>'.&mt('Not implemented').'</h1>');
297: }
298: return;
299: }
300:
301: ###############################################
302: ###############################################
303:
304: =pod
305:
306: =item &output_html_grouped_by_sequence()
307:
308: Presents the statistics data as an html table organized by the order
309: the assessments appear in the course.
310:
311: =cut
312:
313: ###############################################
314: ###############################################
315: sub output_html_grouped_by_sequence {
316: my ($r) = @_;
317: my $problem_num = 0;
318: #$r->print(&ProblemStatisticsLegend());
319: foreach my $sequence (&Apache::lonstatistics::Sequences_with_Assess()) {
320: next if ($sequence->{'num_assess'}<1);
321: $r->print("<h3>".$sequence->{'title'}."</h3>");
322: $r->print('<table border="0"><tr><td bgcolor="#777777">'."\n");
323: $r->print('<table border="0" cellpadding="3">'."\n");
324: $r->print('<tr bgcolor="#FFFFE6">');
325: my $Str = &statistics_table_header('no container no plots');
326: $r->print('<tr bgcolor="#FFFFE6">'.$Str."</tr>\n");
327: foreach my $resource (@{$sequence->{'contents'}}) {
328: next if ($resource->{'type'} ne 'assessment');
329: foreach my $part (@{$resource->{'parts'}}) {
330: $problem_num++;
331: my $data = &get_statistics($sequence,$resource,$part,
332: $problem_num);
333: my $option = '';
334: $r->print('<tr>'.&statistics_html_table_data($data,
335: 'no container').
336: "</tr>\n");
337: }
338: }
339: $r->print("</table>\n");
340: $r->print("</td></tr></table>\n");
341: $r->rflush();
342: }
343: #
344: return;
345: }
346:
347: ###############################################
348: ###############################################
349:
350: =pod
351:
352: =item &output_html_ungrouped()
353:
354: Presents the statistics data in a single html table which can be sorted by
355: different columns.
356:
357: =cut
358:
359: ###############################################
360: ###############################################
361: sub output_html_ungrouped {
362: my ($r,$option) = @_;
363: #
364: if (exists($ENV{'form.plot'}) && $ENV{'form.plot'} ne '') {
365: &plot_statistics($r,$ENV{'form.plot'});
366: }
367: #
368: my $problem_num = 0;
369: my $show_container = 0;
370: my $show_part = 0;
371: #$r->print(&ProblemStatisticsLegend());
372: my $sortby = undef;
373: foreach my $field (@Fields) {
374: if ($ENV{'form.sortby'} eq $field->{'name'}) {
375: $sortby = $field->{'name'};
376: }
377: }
378: if (! defined($sortby) || $sortby eq '' || $sortby eq 'problem_num') {
379: $sortby = 'container';
380: }
381: # If there is more than one sequence, list their titles
382: my @Sequences = &Apache::lonstatistics::Sequences_with_Assess();
383: if (@Sequences < 1) {
384: $option .= ' no container';
385: }
386: #
387: # Compile the data
388: my @Statsarray;
389: foreach my $sequence (@Sequences) {
390: next if ($sequence->{'num_assess'}<1);
391: foreach my $resource (@{$sequence->{'contents'}}) {
392: next if ($resource->{'type'} ne 'assessment');
393: foreach my $part (@{$resource->{'parts'}}) {
394: $problem_num++;
395: my $data = &get_statistics($sequence,$resource,$part,
396: $problem_num);
397: $show_part = 1 if ($part ne '0');
398: #
399: push (@Statsarray,$data);
400: }
401: }
402: }
403: #
404: # Sort the data
405: my @OutputOrder;
406: if ($sortby eq 'container') {
407: @OutputOrder = @Statsarray;
408: } else {
409: # $sortby is already defined, so we can charge ahead
410: if ($sortby =~ /^(title|part)$/i) {
411: # Alpha comparison
412: @OutputOrder = sort {
413: lc($a->{$sortby}) cmp lc($b->{$sortby}) ||
414: lc($a->{'title'}) cmp lc($b->{'title'}) ||
415: lc($a->{'part'}) cmp lc($b->{'part'});
416: } @Statsarray;
417: } else {
418: # Numerical comparison
419: @OutputOrder = sort {
420: my $retvalue = 0;
421: if ($b->{$sortby} eq 'nan') {
422: if ($a->{$sortby} ne 'nan') {
423: $retvalue = -1;
424: } else {
425: $retvalue = 0;
426: }
427: }
428: if ($a->{$sortby} eq 'nan') {
429: if ($b->{$sortby} ne 'nan') {
430: $retvalue = 1;
431: }
432: }
433: if ($retvalue eq '0') {
434: $retvalue = $b->{$sortby} <=> $a->{$sortby} ||
435: lc($a->{'title'}) <=> lc($b->{'title'}) ||
436: lc($a->{'part'}) <=> lc($b->{'part'});
437: }
438: $retvalue;
439: } @Statsarray;
440: }
441: }
442: $option .= 'no part' if (! $show_part);
443: my $num_output = 0;
444: #
445: # output the headers
446: $r->print('<table border="0"><tr><td bgcolor="#777777">'."\n");
447: $r->print('<table border="0" cellpadding="3">'."\n");
448: my $Str = &statistics_table_header($option.' sortable');
449: $r->print('<tr bgcolor="#FFFFE6">'.$Str."</tr>\n");
450: #
451: foreach my $rowdata (@OutputOrder) {
452: $num_output++;
453: if ($num_output % 25 == 0) {
454: $r->print("</table>\n</td></tr></table>\n");
455: #
456: $r->print('<table border="0"><tr><td bgcolor="#777777">'."\n");
457: $r->print('<table border="0" cellpadding="3">'."\n");
458: my $Str = &statistics_table_header($option.' sortable');
459: $r->print('<tr bgcolor="#FFFFE6">'.$Str."</tr>\n");
460: $r->rflush();
461: }
462: $r->print('<tr>'.&statistics_html_table_data($rowdata,$option).
463: "</tr>\n");
464: }
465: $r->print("</table>\n");
466: $r->print("</td></tr></table>\n");
467: $r->rflush();
468: #
469: return;
470: }
471:
472: ###############################################
473: ###############################################
474:
475: =pod
476:
477: =item &output_excel()
478:
479: Presents the statistical data in an Excel 95 compatable spreadsheet file.
480:
481: =cut
482:
483: ###############################################
484: ###############################################
485: sub output_excel {
486: my ($r) = @_;
487: my $filename = '/prtspool/'.
488: $ENV{'user.name'}.'_'.$ENV{'user.domain'}.'_'.
489: time.'_'.rand(1000000000).'.xls';
490: #
491: my $excel_workbook = undef;
492: my $excel_sheet = undef;
493: #
494: my $rows_output = 0;
495: my $cols_output = 0;
496: #
497: # Create sheet
498: $excel_workbook = Spreadsheet::WriteExcel->new('/home/httpd'.$filename);
499: #
500: # Check for errors
501: if (! defined($excel_workbook)) {
502: $r->log_error("Error creating excel spreadsheet $filename: $!");
503: $r->print(&mt("Problems creating new Excel file. ".
504: "This error has been logged. ".
505: "Please alert your LON-CAPA administrator."));
506: return ;
507: }
508: #
509: # The excel spreadsheet stores temporary data in files, then put them
510: # together. If needed we should be able to disable this (memory only).
511: # The temporary directory must be specified before calling 'addworksheet'.
512: # File::Temp is used to determine the temporary directory.
513: $excel_workbook->set_tempdir($Apache::lonnet::tmpdir);
514: #
515: # Add a worksheet
516: my $sheetname = $ENV{'course.'.$ENV{'request.course.id'}.'.description'};
517: if (length($sheetname) > 31) {
518: $sheetname = substr($sheetname,0,31);
519: }
520: $excel_sheet = $excel_workbook->addworksheet($sheetname);
521: #
522: # Put the course description in the header
523: $excel_sheet->write($rows_output,$cols_output++,
524: $ENV{'course.'.$ENV{'request.course.id'}.'.description'});
525: $cols_output += 3;
526: #
527: # Put a description of the sections listed
528: my $sectionstring = '';
529: my @Sections = @Apache::lonstatistics::SelectedSections;
530: if (scalar(@Sections) > 1) {
531: if (scalar(@Sections) > 2) {
532: my $last = pop(@Sections);
533: $sectionstring = "Sections ".join(', ',@Sections).', and '.$last;
534: } else {
535: $sectionstring = "Sections ".join(' and ',@Sections);
536: }
537: } else {
538: if ($Sections[0] eq 'all') {
539: $sectionstring = "All sections";
540: } else {
541: $sectionstring = "Section ".$Sections[0];
542: }
543: }
544: $excel_sheet->write($rows_output,$cols_output++,$sectionstring);
545: $cols_output += scalar(@Sections);
546: #
547: # Put the date in there too
548: $excel_sheet->write($rows_output,$cols_output++,
549: 'Compiled on '.localtime(time));
550: #
551: $rows_output++;
552: $cols_output=0;
553: #
554: # Long Headersheaders
555: foreach my $field (@Fields) {
556: next if ($field->{'name'} eq 'problem_num');
557: if (exists($field->{'long_title'})) {
558: $excel_sheet->write($rows_output,$cols_output++,
559: $field->{'long_title'});
560: } else {
561: $excel_sheet->write($rows_output,$cols_output++,'');
562: }
563: }
564: $rows_output++;
565: $cols_output=0;
566: # Brief headers
567: foreach my $field (@Fields) {
568: next if ($field->{'name'} eq 'problem_num');
569: # Use english for excel as I am not sure how well excel handles
570: # other character sets....
571: $excel_sheet->write($rows_output,$cols_output++,$field->{'title'});
572: }
573: $rows_output++;
574: #
575: # Write the data
576: my $problem_num=0;
577: foreach my $sequence (&Apache::lonstatistics::Sequences_with_Assess()) {
578: next if ($sequence->{'num_assess'}<1);
579: foreach my $resource (@{$sequence->{'contents'}}) {
580: next if ($resource->{'type'} ne 'assessment');
581: foreach my $part (@{$resource->{'parts'}}) {
582: $cols_output=0;
583: $problem_num++;
584: my $data = &get_statistics($sequence,$resource,$part,
585: $problem_num);
586: #
587: if (!defined($part) || $part eq '') {
588: $part = ' ';
589: }
590: foreach my $field (@Fields) {
591: next if ($field->{'name'} eq 'problem_num');
592: $excel_sheet->write($rows_output,$cols_output++,
593: $data->{$field->{'name'}});
594: }
595: $rows_output++;
596: }
597: }
598: }
599: #
600: # Write the excel file
601: $excel_workbook->close();
602: # Tell the user where to get their excel file
603: $r->print('<br />'.
604: '<a href="'.$filename.'">'.
605: &mt('Your Excel Spreadsheet').'</a>'."\n");
606: $r->rflush();
607: return;
608: }
609:
610: ###############################################
611: ###############################################
612:
613: =pod
614:
615: =item &statistics_html_table_data()
616:
617: Help function used to format the rows for HTML table output.
618:
619: =cut
620:
621: ###############################################
622: ###############################################
623: sub statistics_html_table_data {
624: my ($data,$options) = @_;
625: my $row = '';
626: foreach my $field (@Fields) {
627: next if ($options =~ /no $field->{'name'}/);
628: $row .= '<td bgcolor="'.$field->{'color'}.'"';
629: if (exists($field->{'align'})) {
630: $row .= ' align="'.$field->{'align'}.'"';
631: }
632: $row .= '>';
633: if (exists($field->{'special'}) && $field->{'special'} eq 'link') {
634: $row .= '<a href="'.$data->{$field->{'name'}.'.link'}.'">';
635: }
636: if (exists($field->{'format'})) {
637: $row .= sprintf($field->{'format'},$data->{$field->{'name'}});
638: } else {
639: $row .= $data->{$field->{'name'}};
640: }
641: if (exists($field->{'special'}) && $field->{'special'} eq 'link') {
642: $row.= '</a>';
643: }
644: $row .= '</td>';
645: }
646: return $row;
647: }
648:
649: sub statistics_table_header {
650: my ($options) = @_;
651: my $header_row;
652: foreach my $field (@Fields) {
653: next if ($options =~ /no $field->{'name'}/);
654: $header_row .= '<th>';
655: if ($options =~ /sortable/ &&
656: exists($field->{'sortable'}) && $field->{'sortable'} eq 'yes') {
657: $header_row .= '<a href="javascript:'.
658: 'document.Statistics.sortby.value='."'".$field->{'name'}."'".
659: ';document.Statistics.submit();">';
660: }
661: $header_row .= &mt($field->{'title'});
662: if ($options =~ /sortable/) {
663: $header_row.= '</a>';
664: }
665: if ($options !~ /no plots/ &&
666: exists($field->{'graphable'}) &&
667: $field->{'graphable'} eq 'yes') {
668: $header_row.=' (';
669: $header_row .= '<a href="javascript:'.
670: "document.Statistics.plot.value='$field->{'name'}'".
671: ';document.Statistics.submit();">';
672: $header_row .= &mt('plot').'</a>)';
673: }
674: $header_row .= '</th>';
675: }
676: return $header_row;
677: }
678:
679: ###############################################
680: ###############################################
681:
682: =pod
683:
684: =item &plot_statistics()
685:
686: =cut
687:
688: ###############################################
689: ###############################################
690: sub plot_statistics {
691: my ($r,$datafield) = @_;
692: my @Data;
693: #
694: #
695: my $sortfield = undef;
696: my $title = undef;
697: foreach my $field (@Fields) {
698: if ($datafield eq $field->{'name'} &&
699: exists($field->{'graphable'}) && $field->{'graphable'} eq 'yes') {
700: $sortfield = $field->{'name'};
701: $title = $field->{'long_title'};
702: }
703: }
704: return if (! defined($sortfield) || $sortfield eq '');
705: #
706: my $Max = 0;
707: my $problem_num = 0;
708: foreach my $sequence (&Apache::lonstatistics::Sequences_with_Assess()) {
709: next if ($sequence->{'num_assess'}<1);
710: foreach my $resource (@{$sequence->{'contents'}}) {
711: next if ($resource->{'type'} ne 'assessment');
712: foreach my $part (@{$resource->{'parts'}}) {
713: my $problem_number++;
714: my $data = &get_statistics($sequence,$resource,$part,
715: $problem_num);
716: my $value = $data->{$sortfield};
717: $Max = $value if ($Max < $value);
718: push (@Data,$value);
719: }
720: }
721: }
722: #
723: # Print out plot request
724: my $yaxis = '';
725: if ($sortfield eq 'per_wrong') {
726: $yaxis = 'Percent';
727: }
728: #
729: # Determine appropriate value for $Max
730: if ($sortfield eq 'deg_of_diff') {
731: if ($Max > 0.5) {
732: $Max = 1;
733: } elsif ($Max > 0.2) {
734: $Max = 0.5;
735: } elsif ($Max > 0.1) {
736: $Max = 0.2;
737: }
738: } elsif ($sortfield eq 'per_wrong') {
739: if ($Max > 50) {
740: $Max = 100;
741: } elsif ($Max > 25) {
742: $Max = 50;
743: } elsif ($Max > 20) {
744: $Max = 25;
745: } elsif ($Max > 10) {
746: $Max = 20;
747: } elsif ($Max > 5) {
748: $Max = 10;
749: } else {
750: $Max = 5;
751: }
752: }
753:
754: $r->print("<p>".&DrawGraph(\@Data,$title,'Problem Number',$yaxis,
755: $Max)."</p>\n");
756: #
757: # Print out the data
758: $ENV{'form.sortby'} = 'Contents';
759: # &output_html_ungrouped($r);
760: return;
761: }
762:
763: ###############################################
764: ###############################################
765:
766: =pod
767:
768: =item &DrawGraph()
769:
770: =cut
771:
772: ###############################################
773: ###############################################
774: sub DrawGraph {
775: my ($values,$title,$xaxis,$yaxis,$Max)=@_;
776: $title = '' if (! defined($title));
777: $xaxis = '' if (! defined($xaxis));
778: $yaxis = '' if (! defined($yaxis));
779: $title = &Apache::lonnet::escape($title);
780: $xaxis = &Apache::lonnet::escape($xaxis);
781: $yaxis = &Apache::lonnet::escape($yaxis);
782: #
783: my $sendValues = join(',', @$values);
784: my $sendCount = scalar(@$values);
785: $Max =1 if ($Max < 1);
786: if ( int($Max) < $Max ) {
787: $Max++;
788: $Max = int($Max);
789: }
790: my @GData = ($title,$xaxis,$yaxis,$Max,$sendCount,$sendValues);
791: return '<IMG src="/cgi-bin/graph.png?'.
792: (join('&', @GData)).'" border="1" />';
793: }
794:
795: sub get_statistics {
796: my ($sequence,$resource,$part,$problem_num) = @_;
797: #
798: my $symb = $resource->{'symb'};
799: my $courseid = $ENV{'request.course.id'};
800: #
801: my $students = \@Apache::lonstatistics::Students;
802: if ($Apache::lonstatistics::SelectedSections[0] eq 'all') {
803: $students = undef;
804: }
805: my $data = &Apache::loncoursedata::get_problem_statistics
806: ($students,$symb,$part,$courseid);
807: $data->{'part'} = $part;
808: $data->{'problem_num'} = $problem_num;
809: $data->{'container'} = $sequence->{'title'};
810: $data->{'title'} = $resource->{'title'};
811: $data->{'title.link'} = $resource->{'src'}.'?symb='.
812: &Apache::lonnet::escape($resource->{'symb'});
813: #
814: return $data;
815: }
816:
817: ###############################################
818: ###############################################
819:
820: =pod
821:
822: =item &ProblemStatisticsLegend()
823:
824: HELP This needs to be localized, or at least generated automatically.
825:
826: =cut
827:
828: ###############################################
829: ###############################################
830: sub ProblemStatisticsLegend {
831: my $Ptr = '';
832: $Ptr = '<table border="0">';
833: $Ptr .= '<tr><td>';
834: $Ptr .= '<b>#Stdnts</b></td>';
835: $Ptr .= '<td>Total number of students attempted the problem.';
836: $Ptr .= '</td></tr><tr><td>';
837: $Ptr .= '<b>Tries</b></td>';
838: $Ptr .= '<td>Total number of tries for solving the problem.';
839: $Ptr .= '</td></tr><tr><td>';
840: $Ptr .= '<b>Max Tries</b></td>';
841: $Ptr .= '<td>Largest number of tries for solving the problem by a student.';
842: $Ptr .= '</td></tr><tr><td>';
843: $Ptr .= '<b>Mean</b></td>';
844: $Ptr .= '<td>Average number of tries. [ Tries / #Stdnts ]';
845: $Ptr .= '</td></tr><tr><td>';
846: $Ptr .= '<b>#YES</b></td>';
847: $Ptr .= '<td>Number of students solved the problem correctly.';
848: $Ptr .= '</td></tr><tr><td>';
849: $Ptr .= '<b>#yes</b></td>';
850: $Ptr .= '<td>Number of students solved the problem by override.';
851: $Ptr .= '</td></tr><tr><td>';
852: $Ptr .= '<b>%Wrong</b></td>';
853: $Ptr .= '<td>Percentage of students who tried to solve the problem ';
854: $Ptr .= 'but is still incorrect. [ 100*((#Stdnts-(#YES+#yes))/#Stdnts) ]';
855: $Ptr .= '</td></tr><tr><td>';
856: $Ptr .= '<b>DoDiff</b></td>';
857: $Ptr .= '<td>Degree of Difficulty of the problem. ';
858: $Ptr .= '[ 1 - ((#YES+#yes) / Tries) ]';
859: $Ptr .= '</td></tr><tr><td>';
860: $Ptr .= '<b>S.D.</b></td>';
861: $Ptr .= '<td>Standard Deviation of the tries. ';
862: $Ptr .= '[ sqrt(sum((Xi - Mean)^2)) / (#Stdnts-1) ';
863: $Ptr .= 'where Xi denotes every student\'s tries ]';
864: $Ptr .= '</td></tr><tr><td>';
865: $Ptr .= '<b>Skew.</b></td>';
866: $Ptr .= '<td>Skewness of the students tries.';
867: $Ptr .= '[(sqrt( sum((Xi - Mean)^3) / #Stdnts)) / (S.D.^3)]';
868: $Ptr .= '</td></tr><tr><td>';
869: $Ptr .= '<b>Dis.F.</b></td>';
870: $Ptr .= '<td>Discrimination Factor: A Standard for evaluating the ';
871: $Ptr .= 'problem according to a Criterion<br>';
872: $Ptr .= '<b>[Criterion to group students into %27 Upper Students - ';
873: $Ptr .= 'and %27 Lower Students]</b><br>';
874: $Ptr .= '<b>1st Criterion</b> for Sorting the Students: ';
875: $Ptr .= '<b>Sum of Partial Credit Awarded / Total Number of Tries</b><br>';
876: $Ptr .= '<b>2nd Criterion</b> for Sorting the Students: ';
877: $Ptr .= '<b>Total number of Correct Answers / Total Number of Tries</b>';
878: $Ptr .= '</td></tr>';
879: $Ptr .= '<tr><td><b>Disc.</b></td>';
880: $Ptr .= '<td>Number of Students had at least one discussion.';
881: $Ptr .= '</td></tr></table>';
882: return $Ptr;
883: }
884:
885: #---- END Problem Statistics Web Page ----------------------------------------
886:
887: 1;
888: __END__
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