1: # The LearningOnline Network with CAPA
2: #
3: # $Id: lonproblemstatistics.pm,v 1.94 2004/10/06 15:37:59 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::loncommon();
55: use Apache::lonhtmlcommon;
56: use Apache::loncoursedata;
57: use Apache::lonstatistics;
58: use LONCAPA::lonmetadata();
59: use Apache::lonlocal;
60: use Spreadsheet::WriteExcel;
61: use Apache::lonstathelpers();
62: use Time::HiRes;
63:
64: my @StatsArray;
65: my %SeqStat; # keys are symbs, values are hash refs
66:
67: ##
68: ## Localization notes:
69: ##
70: ## in @Fields[0]->{'long_title'} is placed in Excel files and is used as the
71: ## header for plots created with Graph.pm, both of which more than likely do
72: ## not support localization.
73: ##
74: #
75: #
76: ##
77: ## Description of Field attributes
78: ##
79: ## Attribute Required Value Meaning or Use
80: ##
81: ## name yes any scalar Used to uniquely identify field
82: ## title yes any scalar This is what the user sees to identify
83: ## the field. Passed through &mt().
84: ## long_title yes any scalar Used as graph heading and in excel
85: ## output. NOT translated
86: ## align no (left|right|center) HTML cell contents alignment
87: ## color yes html color HTML cell background color
88: ## used to visually group statistics
89: ## special no (link) Indicates a link, target is name.link
90: ## Currently set in &get_statistics()
91: ## graphable no (yes|no) Can a bar graph of the field be
92: ## produced?
93: ## sortable no (yes|no) Should a sort link be put in the
94: ## column header?
95: ## selectable yes (yes|no) Can the column be removed from the
96: ## statistics display?
97: ## selected yes (yes|no) Is the column selected by default?
98: ##
99: ## format no sprintf format string
100: ##
101: ## excel_format no excel format type
102: ## (see &Apache::loncommon::define_excel_formats
103: my @Fields = (
104: { name => 'problem_num',
105: title => 'P#',
106: align => 'right',
107: color => '#FFFFE6',
108: selectable => 'no',
109: defaultselected => 'yes',
110: },
111: { name => 'container',
112: title => 'Sequence or Folder',
113: align => 'left',
114: color => '#FFFFE6',
115: sortable => 'yes',
116: selectable => 'no',
117: defaultselected => 'yes',
118: },
119: { name => 'title',
120: title => 'Title',
121: align => 'left',
122: color => '#FFFFE6',
123: special => 'link',
124: sortable => 'yes',
125: selectable => 'no',
126: defaultselected => 'yes',
127: },
128: { name => 'part',
129: title => 'Part',
130: align => 'left',
131: color => '#FFFFE6',
132: selectable => 'no',
133: defaultselected => 'yes',
134: },
135: { name => 'num_students',
136: title => '#Stdnts',
137: align => 'right',
138: color => '#EEFFCC',
139: format => '%d',
140: sortable => 'yes',
141: graphable => 'yes',
142: long_title => 'Number of Students Attempting Problem',
143: selectable => 'yes',
144: defaultselected => 'yes',
145: },
146: { name => 'tries',
147: title => 'Tries',
148: align => 'right',
149: color => '#EEFFCC',
150: format => '%d',
151: sortable => 'yes',
152: graphable => 'yes',
153: long_title => 'Total Number of Tries',
154: selectable => 'yes',
155: defaultselected => 'yes',
156: },
157: { name => 'max_tries',
158: title => 'Max Tries',
159: align => 'right',
160: color => '#DDFFFF',
161: format => '%d',
162: sortable => 'yes',
163: graphable => 'yes',
164: long_title => 'Maximum Number of Tries',
165: selectable => 'yes',
166: defaultselected => 'yes',
167: },
168: { name => 'min_tries',
169: title => 'Min Tries',
170: align => 'right',
171: color => '#DDFFFF',
172: format => '%d',
173: sortable => 'yes',
174: graphable => 'yes',
175: long_title => 'Minumum Number of Tries',
176: selectable => 'yes',
177: defaultselected => 'yes',
178: },
179: { name => 'mean_tries',
180: title => 'Mean Tries',
181: align => 'right',
182: color => '#DDFFFF',
183: format => '%5.2f',
184: sortable => 'yes',
185: graphable => 'yes',
186: long_title => 'Average Number of Tries',
187: selectable => 'yes',
188: defaultselected => 'yes',
189: },
190: { name => 'std_tries',
191: title => 'S.D. tries',
192: align => 'right',
193: color => '#DDFFFF',
194: format => '%5.2f',
195: sortable => 'yes',
196: graphable => 'yes',
197: long_title => 'Standard Deviation of Number of Tries',
198: selectable => 'yes',
199: defaultselected => 'yes',
200: },
201: { name => 'skew_tries',
202: title => 'Skew Tries',
203: align => 'right',
204: color => '#DDFFFF',
205: format => '%5.2f',
206: sortable => 'yes',
207: graphable => 'yes',
208: long_title => 'Skew of Number of Tries',
209: selectable => 'yes',
210: defaultselected => 'no',
211: },
212: { name => 'num_solved',
213: title => '#YES',
214: align => 'right',
215: color => '#FFDDDD',
216: format => '%4.1f',# format => '%d',
217: sortable => 'yes',
218: graphable => 'yes',
219: long_title => 'Number of Students able to Solve',
220: selectable => 'yes',
221: defaultselected => 'yes',
222: },
223: { name => 'num_override',
224: title => '#yes',
225: align => 'right',
226: color => '#FFDDDD',
227: format => '%4.1f',# format => '%d',
228: sortable => 'yes',
229: graphable => 'yes',
230: long_title => 'Number of Students given Override',
231: selectable => 'yes',
232: defaultselected => 'yes',
233: },
234: { name => 'num_wrong',
235: title => '#Wrng',
236: align => 'right',
237: color => '#FFDDDD',
238: format => '%4.1f',
239: sortable => 'yes',
240: graphable => 'yes',
241: long_title => 'Number of students whose final answer is wrong',
242: selectable => 'yes',
243: defaultselected => 'yes',
244: },
245: { name => 'per_wrong',
246: title => '%Wrng',
247: align => 'right',
248: color => '#FFDDDD',
249: format => '%4.1f',
250: sortable => 'yes',
251: graphable => 'yes',
252: long_title => 'Percent of students whose final answer is wrong',
253: selectable => 'yes',
254: defaultselected => 'yes',
255: },
256: { name => 'deg_of_diff',
257: title => 'DoDiff',
258: align => 'right',
259: color => '#FFFFE6',
260: format => '%5.2f',
261: sortable => 'yes',
262: graphable => 'yes',
263: long_title => 'Degree of Difficulty'.
264: '[ 1 - ((#YES+#yes) / Tries) ]',
265: selectable => 'yes',
266: defaultselected => 'yes',
267: },
268: { name => 'deg_of_disc',
269: title => 'DoDisc',
270: align => 'right',
271: color => '#FFFFE6',
272: format => '%4.2f',
273: sortable => 'yes',
274: graphable => 'yes',
275: long_title => 'Degree of Discrimination',
276: selectable => 'yes',
277: defaultselected => 'yes',
278: },
279: ## duedate included for research purposes. Commented out most of the time.
280: # { name => 'duedate',
281: # title => 'Due Date',
282: # align => 'left',
283: # color => '#FFFFFF',
284: # sortable => 'yes',
285: # graphable => 'no',
286: # long_title => 'Due date of resource for instructor',
287: # selectable => 'no',
288: # defaultselected => 'yes',
289: # },
290: ## opendate included for research purposes. Commented out most of the time.
291: # { name => 'opendate',
292: # title => 'Open Date',
293: # align => 'left',
294: # color => '#FFFFFF',
295: # sortable => 'yes',
296: # graphable => 'no',
297: # long_title => 'date resource became answerable',
298: # selectable => 'no',
299: # defaultselected => 'yes',
300: # },
301: ## symb included for research purposes. Commented out most of the time.
302: # { name => 'symb',
303: # title => 'Symb',
304: # align => 'left',
305: # color => '#FFFFFF',
306: # sortable => 'yes',
307: # graphable => 'no',
308: # long_title => 'Unique LON-CAPA identifier for problem',
309: # selectable => 'no',
310: # defaultselected => 'yes',
311: # },
312: ## resptypes included for research purposes. Commented out most of the time.
313: # { name => 'resptypes',
314: # title => 'Response Types',
315: # align => 'left',
316: # color => '#FFFFFF',
317: # sortable => 'no',
318: # graphable => 'no',
319: # long_title => 'Response Types used in this problem',
320: # selectable => 'no',
321: # defaultselected => 'yes',
322: # },
323: ## maxtries included for research purposes. Commented out most of the time.
324: # { name => 'maxtries',
325: # title => 'Maxtries',
326: # align => 'left',
327: # color => '#FFFFFF',
328: # sortable => 'no',
329: # graphable => 'no',
330: # long_title => 'Maximum number of tries',
331: # selectable => 'no',
332: # defaultselected => 'yes',
333: # },
334: ## hinttries included for research purposes. Commented out most of the time.
335: # { name => 'hinttries',
336: # title => 'hinttries',
337: # align => 'left',
338: # color => '#FFFFFF',
339: # sortable => 'no',
340: # graphable => 'no',
341: # long_title => 'Number of tries before a hint appears',
342: # selectable => 'no',
343: # defaultselected => 'yes',
344: # },
345: );
346:
347: my @SeqFields = (
348: { name => 'title',
349: title => 'Sequence',
350: align => 'left',
351: color => '#FFFFE6',
352: special => 'no',
353: sortable => 'no',
354: selectable => 'yes',
355: defaultselected => 'no',
356: },
357: { name => 'items',
358: title => '#Items',
359: align => 'right',
360: color => '#FFFFE6',
361: format => '%4d',
362: sortable => 'no',
363: graphable => 'no',
364: long_title => 'Number of Items in Sequence',
365: selectable => 'yes',
366: defaultselected => 'no',
367: },
368: { name => 'scoremean',
369: title => 'Score Mean',
370: align => 'right',
371: color => '#FFFFE6',
372: format => '%4.2f',
373: sortable => 'no',
374: graphable => 'no',
375: long_title => 'Mean Sequence Score',
376: selectable => 'yes',
377: defaultselected => 'no',
378: },
379: { name => 'scorestd',
380: title => 'Score STD',
381: align => 'right',
382: color => '#FFFFE6',
383: format => '%4.2f',
384: sortable => 'no',
385: graphable => 'no',
386: long_title => 'Standard Deviation of Sequence Scores',
387: selectable => 'yes',
388: defaultselected => 'no',
389: },
390: { name => 'scoremax',
391: title => 'Score Max',
392: align => 'right',
393: color => '#FFFFE6',
394: format => '%4.2f',
395: sortable => 'no',
396: graphable => 'no',
397: long_title => 'Maximum Sequence Score',
398: selectable => 'yes',
399: defaultselected => 'no',
400: },
401: { name => 'scoremin',
402: title => 'Score Min',
403: align => 'right',
404: color => '#FFFFE6',
405: format => '%4.2f',
406: sortable => 'no',
407: graphable => 'no',
408: long_title => 'Minumum Sequence Score',
409: selectable => 'yes',
410: defaultselected => 'no',
411: },
412: { name => 'scorecount',
413: title => 'Score N',
414: align => 'right',
415: color => '#FFFFE6',
416: format => '%4d',
417: sortable => 'no',
418: graphable => 'no',
419: long_title => 'Number of Students in score computations',
420: selectable => 'yes',
421: defaultselected => 'no',
422: },
423: { name => 'countmean',
424: title => 'Count Mean',
425: align => 'right',
426: color => '#FFFFFF',
427: format => '%4.2f',
428: sortable => 'no',
429: graphable => 'no',
430: long_title => 'Mean Sequence Score',
431: selectable => 'yes',
432: defaultselected => 'no',
433: },
434: { name => 'countstd',
435: title => 'Count STD',
436: align => 'right',
437: color => '#FFFFFF',
438: format => '%4.2f',
439: sortable => 'no',
440: graphable => 'no',
441: long_title => 'Standard Deviation of Sequence Scores',
442: selectable => 'yes',
443: defaultselected => 'no',
444: },
445: { name => 'countmax',
446: title => 'Count Max',
447: align => 'right',
448: color => '#FFFFFF',
449: format => '%4.2f',
450: sortable => 'no',
451: graphable => 'no',
452: long_title => 'Maximum Number of Correct Problems',
453: selectable => 'yes',
454: defaultselected => 'no',
455: },
456: { name => 'countmin',
457: title => 'Count Min',
458: align => 'right',
459: color => '#FFFFFF',
460: format => '%4.2f',
461: sortable => 'no',
462: graphable => 'no',
463: long_title => 'Minumum Number of Correct Problems',
464: selectable => 'yes',
465: defaultselected => 'no',
466: },
467: { name => 'count',
468: title => 'Count N',
469: align => 'right',
470: color => '#FFFFFF',
471: format => '%4d',
472: sortable => 'no',
473: graphable => 'no',
474: long_title => 'Number of Students in score computations',
475: selectable => 'yes',
476: defaultselected => 'no',
477: },
478: { name => 'KR-21',
479: title => 'KR-21',
480: align => 'right',
481: color => '#FFAAAA',
482: format => '%4.2f',
483: sortable => 'no',
484: graphable => 'no',
485: long_title => 'KR-21 reliability statistic',
486: selectable => 'yes',
487: defaultselected => 'no',
488: },
489: );
490:
491: my %SelectedFields;
492:
493: sub parse_field_selection {
494: #
495: # Pull out the defaults
496: if (! defined($ENV{'form.fieldselections'})) {
497: $ENV{'form.fieldselections'} = [];
498: foreach my $field (@Fields) {
499: next if ($field->{'selectable'} ne 'yes');
500: if ($field->{'defaultselected'} eq 'yes') {
501: push(@{$ENV{'form.fieldselections'}},$field->{'name'});
502: }
503: }
504: }
505: #
506: # Make sure the data we are plotting is there
507: my %NeededFields;
508: if (exists($ENV{'form.plot'}) && $ENV{'form.plot'} ne '' &&
509: $ENV{'form.plot'} ne 'none') {
510: if ($ENV{'form.plot'} eq 'degrees') {
511: $NeededFields{'deg_of_diff'}++;
512: $NeededFields{'deg_of_disc'}++;
513: } elsif ($ENV{'form.plot'} eq 'tries statistics') {
514: $NeededFields{'mean_tries'}++;
515: $NeededFields{'std_tries'}++;
516: $NeededFields{'problem_num'}++;
517: } else {
518: $NeededFields{$ENV{'form.plot'}}++;
519: }
520: }
521: #
522: # This should not happen, but in case it does...
523: if (ref($ENV{'form.fieldselections'}) ne 'ARRAY') {
524: $ENV{'form.fieldselections'} = [$ENV{'form.fieldselections'}];
525: }
526: #
527: # Set the field data and the selected fields (for easier checking)
528: undef(%SelectedFields);
529: foreach my $field (@Fields) {
530: if ($field->{'selectable'} ne 'yes') {
531: $field->{'selected'} = 'yes';
532: } else {
533: $field->{'selected'} = 'no';
534: }
535: if (exists($NeededFields{$field->{'name'}})) {
536: $field->{'selected'} = 'yes';
537: $SelectedFields{$field->{'name'}}++;
538: }
539: foreach my $selection (@{$ENV{'form.fieldselections'}}) {
540: if ($selection eq $field->{'name'} || $selection eq 'all') {
541: $field->{'selected'} = 'yes';
542: $SelectedFields{$field->{'name'}}++;
543: }
544: }
545: }
546: #
547: # Always show all the sequence statistics (for now)
548: foreach my $field (@SeqFields) {
549: $field->{'selected'} = 'yes';
550: }
551: return;
552: }
553:
554: sub field_selection_input {
555: my $Str = '<select name="fieldselections" multiple size="5">'."\n";
556: $Str .= '<option value="all">all</option>'."\n";
557: foreach my $field (@Fields) {
558: next if ($field->{'selectable'} ne 'yes');
559: $Str .= ' <option value="'.$field->{'name'}.'" ';
560: if ($field->{'selected'} eq 'yes') {
561: $Str .= 'selected ';
562: }
563: $Str .= '>'.$field->{'title'}.'</option>'."\n";
564: }
565: $Str .= "</select>\n";
566: }
567:
568: ###############################################
569: ###############################################
570:
571: =pod
572:
573: =item &CreateInterface()
574:
575: Create the main intereface for the statistics page. Allows the user to
576: select sections, maps, and output.
577:
578: =cut
579:
580: ###############################################
581: ###############################################
582: sub CreateInterface {
583: my ($r) = @_;
584: #
585: &parse_field_selection();
586: #
587: my $Str = '';
588: $Str .= &Apache::lonhtmlcommon::breadcrumbs
589: (undef,'Overall Problem Statistics','Statistics_Overall_Key');
590: $Str .= '<table cellspacing="5">'."\n";
591: $Str .= '<tr>';
592: $Str .= '<td align="center"><b>'.&mt('Sections').'</b></td>';
593: $Str .= '<td align="center"><b>'.&mt('Enrollment Status').'</b></td>';
594: $Str .= '<td align="center"><b>'.&mt('Sequences and Folders').'</b></td>';
595: $Str .= '<td align="center"><b>'.&mt('Statistics').'</b></td>';
596: $Str .= '<td rowspan="2">'.
597: &Apache::lonstathelpers::limit_by_time_form().'</td>';
598: $Str .= '</tr>'."\n";
599: #
600: $Str .= '<tr><td align="center">'."\n";
601: $Str .= &Apache::lonstatistics::SectionSelect('Section','multiple',5);
602: $Str .= '</td><td align="center">';
603: $Str .= &Apache::lonhtmlcommon::StatusOptions(undef,undef,5);
604: $Str .= '</td><td align="center">';
605: #
606: my $only_seq_with_assessments = sub {
607: my $s=shift;
608: if ($s->{'num_assess'} < 1) {
609: return 0;
610: } else {
611: return 1;
612: }
613: };
614: $Str .= &Apache::lonstatistics::MapSelect('Maps','multiple,all',5,
615: $only_seq_with_assessments);
616: $Str .= '</td><td>'.&field_selection_input();
617: $Str .= '</td></tr>'."\n";
618: $Str .= '</table>'."\n";
619: #
620: $Str .= '<p>'.&mt('Status: [_1]',
621: '<input type="text" '.
622: 'name="stats_status" size="60" value="" />'
623: ).
624: '</nobr></p>';
625: #
626: $Str .= '<input type="submit" name="GenerateStatistics" value="'.
627: &mt('Generate Statistics').'" />';
628: $Str .= ' 'x5;
629: $Str .= 'Plot '.&plot_dropdown().(' 'x10);
630: #
631: return $Str;
632: }
633:
634: ###############################################
635: ###############################################
636:
637: =pod
638:
639: =item &BuildProblemStatisticsPage()
640:
641: Main interface to problem statistics.
642:
643: =cut
644:
645: ###############################################
646: ###############################################
647: sub BuildProblemStatisticsPage {
648: my ($r,$c)=@_;
649: #
650: my %Saveable_Parameters = ('Status' => 'scalar',
651: 'statsoutputmode' => 'scalar',
652: 'Section' => 'array',
653: 'StudentData' => 'array',
654: 'Maps' => 'array',
655: 'fieldselections'=> 'array');
656: &Apache::loncommon::store_course_settings('statistics',
657: \%Saveable_Parameters);
658: &Apache::loncommon::restore_course_settings('statistics',
659: \%Saveable_Parameters);
660: #
661: &Apache::lonstatistics::PrepareClasslist();
662: #
663: # Clear the package variables
664: undef(@StatsArray);
665: undef(%SeqStat);
666: #
667: # Finally let the user know we are here
668: my $interface = &CreateInterface($r);
669: $r->print($interface);
670: $r->print('<input type="hidden" name="sortby" value="'.$ENV{'form.sortby'}.
671: '" />');
672: #
673: my @CacheButtonHTML =
674: &Apache::lonstathelpers::manage_caches($r,'Statistics','stats_status');
675: my $Str;
676: foreach my $html (@CacheButtonHTML) {
677: $Str.=$html.(' 'x5);
678: }
679: #
680: $r->print($Str);
681: if (! exists($ENV{'form.firstrun'})) {
682: $r->print('<h3>'.
683: &mt('Press "Generate Statistics" when you are ready.').
684: '</h3><p>'.
685: &mt('It may take some time to update the student data '.
686: 'for the first analysis. Future analysis this session '.
687: ' will not have this delay.').
688: '</p>');
689: return;
690: }
691: $r->rflush();
692: #
693: # This probably does not need to be done each time we are called, but
694: # it does not slow things down noticably.
695: &Apache::loncoursedata::populate_weight_table();
696: #
697: if (exists($ENV{'form.Excel'})) {
698: &Excel_output($r);
699: } else {
700: $r->print('<input type="submit" name="Excel" value="'.
701: &mt('Produce Excel Output').'" />'.' 'x5);
702: $r->rflush();
703: my $count = 0;
704: foreach my $seq (&Apache::lonstatistics::Sequences_with_Assess()) {
705: $count += $seq->{'num_assess_parts'};
706: }
707: if ($count > 10) {
708: $r->print('<h2>'.
709: &mt('Compiling statistics for [_1] problems',$count).
710: '</h2>');
711: if ($count > 30) {
712: $r->print('<h3>'.&mt('This will take some time.').'</h3>');
713: }
714: $r->rflush();
715: }
716: #
717: my $sortby = $ENV{'form.sortby'};
718: $sortby = 'container' if (! defined($sortby) || $sortby =~ /^\s*$/);
719: my $plot = $ENV{'form.plot'};
720: if ($plot eq '' || $plot eq 'none') {
721: undef($plot);
722: }
723: if ($sortby eq 'container' && ! defined($plot)) {
724: &output_sequence_statistics($r);
725: &output_html_by_sequence($r);
726: } else {
727: if (defined($plot)) {
728: &make_plot($r,$plot);
729: }
730: &output_html_stats($r);
731: &output_sequence_statistics($r);
732: }
733: }
734: return;
735: }
736:
737: sub output_sequence_statistics {
738: my ($r) = @_;
739: my $c=$r->connection();
740: $r->print('<h2>'.&mt('Sequence Statistics').
741: &Apache::loncommon::help_open_topic('Statistics_Sequence').
742: '</h2>');
743: $r->print('<table border="0"><tr><td bgcolor="#777777">'."\n".
744: '<table border="0" cellpadding="3">'."\n".
745: '<tr bgcolor="#FFFFE6">');
746: $r->print(&sequence_html_header());
747: foreach my $seq (&Apache::lonstatistics::Sequences_with_Assess()) {
748: last if ($c->aborted);
749: next if ($seq->{'num_assess'} < 1);
750: &compute_sequence_statistics($seq);
751: $r->print(&sequence_html_output($seq));
752: }
753: $r->print('</table>');
754: $r->print('</table>');
755: $r->rflush();
756: return;
757: }
758:
759:
760: ##########################################################
761: ##########################################################
762: ##
763: ## HTML output routines
764: ##
765: ##########################################################
766: ##########################################################
767: sub output_html_by_sequence {
768: my ($r) = @_;
769: my $c = $r->connection();
770: $r->print(&html_preamble());
771: #
772: foreach my $seq (&Apache::lonstatistics::Sequences_with_Assess()) {
773: last if ($c->aborted);
774: next if ($seq->{'num_assess'} < 1);
775: $r->print("<h3>".$seq->{'title'}."</h3>".
776: '<table border="0"><tr><td bgcolor="#777777">'."\n".
777: '<table border="0" cellpadding="3">'."\n".
778: '<tr bgcolor="#FFFFE6">'.
779: &statistics_table_header('no container')."</tr>\n");
780: my @Data = &compute_statistics_on_sequence($seq);
781: foreach my $data (@Data) {
782: $r->print('<tr>'.&statistics_html_table_data($data,
783: 'no container').
784: "</tr>\n");
785: }
786: $r->print('</table>'."\n".'</table>'."\n");
787: $r->rflush();
788: }
789: return;
790: }
791:
792: sub output_html_stats {
793: my ($r)=@_;
794: &compute_all_statistics($r);
795: $r->print(&html_preamble());
796: &sort_data($ENV{'form.sortby'});
797: #
798: my $count=0;
799: foreach my $data (@StatsArray) {
800: if ($count++ % 50 == 0) {
801: $r->print("</table>\n</table>\n");
802: $r->print('<table border="0"><tr><td bgcolor="#777777">'."\n".
803: '<table border="0" cellpadding="3">'."\n".
804: '<tr bgcolor="#FFFFE6">'.
805: '<tr bgcolor="#FFFFE6">'.
806: &statistics_table_header().
807: "</tr>\n");
808: }
809: $r->print('<tr>'.&statistics_html_table_data($data)."</tr>\n");
810: }
811: $r->print("</table>\n</table>\n");
812: return;
813: }
814:
815: sub html_preamble {
816: my $Str='';
817: $Str .= "<h2>".
818: $ENV{'course.'.$ENV{'request.course.id'}.'.description'}.
819: "</h2>\n";
820: my ($starttime,$endtime) = &Apache::lonstathelpers::get_time_limits();
821: if (defined($starttime) || defined($endtime)) {
822: # Inform the user what the time limits on the data are.
823: $Str .= '<h3>'.&mt('Statistics on submissions from [_1] to [_2]',
824: &Apache::lonlocal::locallocaltime($starttime),
825: &Apache::lonlocal::locallocaltime($endtime)
826: ).'</h3>';
827: }
828: $Str .= "<h3>".&mt('Compiled on [_1]',
829: &Apache::lonlocal::locallocaltime(time))."</h3>";
830: return $Str;
831: }
832:
833:
834: ###############################################
835: ###############################################
836: ##
837: ## Misc HTML output routines
838: ##
839: ###############################################
840: ###############################################
841: sub statistics_html_table_data {
842: my ($data,$options) = @_;
843: my $row = '';
844: foreach my $field (@Fields) {
845: next if ($options =~ /no $field->{'name'}/);
846: next if ($field->{'selected'} ne 'yes');
847: $row .= '<td bgcolor="'.$field->{'color'}.'"';
848: if (exists($field->{'align'})) {
849: $row .= ' align="'.$field->{'align'}.'"';
850: }
851: $row .= '>';
852: if (exists($field->{'special'}) && $field->{'special'} eq 'link') {
853: $row .= '<a href="'.$data->{$field->{'name'}.'.link'}.'">';
854: }
855: if (exists($field->{'format'}) && $data->{$field->{'name'}} !~ /[A-Z]/i) {
856: $row .= sprintf($field->{'format'},$data->{$field->{'name'}});
857: } else {
858: $row .= $data->{$field->{'name'}};
859: }
860: if (exists($field->{'special'}) && $field->{'special'} eq 'link') {
861: $row.= '</a>';
862: }
863: $row .= '</td>';
864: }
865: return $row;
866: }
867:
868: sub statistics_table_header {
869: my ($options) = @_;
870: my $header_row;
871: foreach my $field (@Fields) {
872: next if ($options =~ /no $field->{'name'}/);
873: next if ($field->{'selected'} ne 'yes');
874: $header_row .= '<th>';
875: if (exists($field->{'sortable'}) && $field->{'sortable'} eq 'yes') {
876: $header_row .= '<a href="javascript:'.
877: 'document.Statistics.sortby.value='."'".$field->{'name'}."'".
878: ';document.Statistics.submit();">';
879: }
880: $header_row .= &mt($field->{'title'});
881: if ($options =~ /sortable/) {
882: $header_row.= '</a>';
883: }
884: if ($options !~ /no plots/ &&
885: exists($field->{'graphable'}) &&
886: $field->{'graphable'} eq 'yes') {
887: $header_row.=' (';
888: $header_row .= '<a href="javascript:'.
889: "document.Statistics.plot.value='$field->{'name'}'".
890: ';document.Statistics.submit();">';
891: $header_row .= &mt('plot').'</a>)';
892: }
893: $header_row .= '</th>';
894: }
895: return $header_row;
896: }
897:
898: sub sequence_html_header {
899: my $Str .= '<tr>';
900: foreach my $field (@SeqFields) {
901: # next if ($field->{'selected'} ne 'yes');
902: $Str .= '<th bgcolor="'.$field->{'color'}.'"';
903: $Str .= '>'.$field->{'title'}.'</th>';
904: }
905: $Str .= '</tr>';
906: return $Str;
907: }
908:
909:
910: sub sequence_html_output {
911: my ($seq) = @_;
912: my $data = $SeqStat{$seq->{'symb'}};
913: my $row = '<tr>';
914: foreach my $field (@SeqFields) {
915: next if ($field->{'selected'} ne 'yes');
916: $row .= '<td bgcolor="'.$field->{'color'}.'"';
917: if (exists($field->{'align'})) {
918: $row .= ' align="'.$field->{'align'}.'"';
919: }
920: $row .= '>';
921: if (exists($field->{'format'})) {
922: $row .= sprintf($field->{'format'},$data->{$field->{'name'}});
923: } else {
924: $row .= $data->{$field->{'name'}};
925: }
926: $row .= '</td>';
927: }
928: $row .= '</tr>'."\n";
929: return $row;
930: }
931:
932: ####################################################
933: ####################################################
934: ##
935: ## Plotting Routines
936: ##
937: ####################################################
938: ####################################################
939: sub make_plot {
940: my ($r,$plot) = @_;
941: &compute_all_statistics($r);
942: &sort_data($ENV{'form.sortby'});
943: if ($plot eq 'degrees') {
944: °rees_plot($r);
945: } elsif ($plot eq 'tries statistics') {
946: &tries_data_plot($r);
947: } else {
948: &make_single_stat_plot($r,$plot);
949: }
950: return;
951: }
952:
953: sub make_single_stat_plot {
954: my ($r,$datafield) = @_;
955: #
956: my $title; my $yaxis;
957: foreach my $field (@Fields) {
958: next if ($field->{'name'} ne $datafield);
959: $title = $field->{'long_title'};
960: $yaxis = $field->{'title'};
961: last;
962: }
963: if ($title eq '' || $yaxis eq '') {
964: # datafield is something we do not know enough about to plot
965: $r->print('<h3>'.
966: &mt('Unable to plot the requested statistic.').
967: '</h3>');
968: return;
969: }
970: #
971: # Build up the data sets to plot
972: my @Labels;
973: my @Data;
974: my $max = 1;
975: foreach my $data (@StatsArray) {
976: push(@Labels,$data->{'problem_num'});
977: push(@Data,$data->{$datafield});
978: if ($data->{$datafield}>$max) {
979: $max = $data->{$datafield};
980: }
981: }
982: foreach (1,2,3,4,5,10,15,20,25,40,50,75,100,150,200,250,300,500,600,750,
983: 1000,1500,2000,2500,3000,3500,4000,5000,7500,10000,15000,20000) {
984: if ($max <= $_) {
985: $max = $_;
986: last;
987: }
988: }
989: if ($max > 20000) {
990: $max = 10000*(int($max/10000)+1);
991: }
992: #
993: $r->print("<p>".&Apache::loncommon::DrawBarGraph($title,
994: 'Problem Number',
995: $yaxis,
996: $max,
997: undef, # colors
998: \@Labels,
999: \@Data)."</p>\n");
1000: return;
1001: }
1002:
1003: sub degrees_plot {
1004: my ($r)=@_;
1005: my $count = scalar(@StatsArray);
1006: my $width = 50 + 10*$count;
1007: $width = 300 if ($width < 300);
1008: my $height = 300;
1009: my $plot = '';
1010: my $ymax = 0;
1011: my $ymin = 0;
1012: my @Disc; my @Diff; my @Labels;
1013: foreach my $data (@StatsArray) {
1014: push(@Labels,$data->{'problem_num'});
1015: my $disc = $data->{'deg_of_disc'};
1016: my $diff = $data->{'deg_of_diff'};
1017: push(@Disc,$disc);
1018: push(@Diff,$diff);
1019: #
1020: $ymin = $disc if ($ymin > $disc);
1021: $ymin = $diff if ($ymin > $diff);
1022: $ymax = $disc if ($ymax < $disc);
1023: $ymax = $diff if ($ymax < $diff);
1024: }
1025: #
1026: # Make sure we show relevant information.
1027: if ($ymin < 0) {
1028: if (abs($ymin) < 0.05) {
1029: $ymin = 0;
1030: } else {
1031: $ymin = -1;
1032: }
1033: }
1034: if ($ymax > 0) {
1035: if (abs($ymax) < 0.05) {
1036: $ymax = 0;
1037: } else {
1038: $ymax = 1;
1039: }
1040: }
1041: #
1042: my $xmax = $Labels[-1];
1043: if ($xmax > 50) {
1044: if ($xmax % 10 != 0) {
1045: $xmax = 10 * (int($xmax/10)+1);
1046: }
1047: } else {
1048: if ($xmax % 5 != 0) {
1049: $xmax = 5 * (int($xmax/5)+1);
1050: }
1051: }
1052: #
1053: my $discdata .= '<data>'.join(',',@Labels).'</data>'.$/.
1054: '<data>'.join(',',@Disc).'</data>'.$/;
1055: #
1056: my $diffdata .= '<data>'.join(',',@Labels).'</data>'.$/.
1057: '<data>'.join(',',@Diff).'</data>'.$/;
1058: #
1059: my $title = 'Degree of Discrimination\nand Degree of Difficulty';
1060: if ($xmax > 50) {
1061: $title = 'Degree of Discrimination and Degree of Difficulty';
1062: }
1063: #
1064: $plot=<<"END";
1065: <gnuplot
1066: texfont="10"
1067: fgcolor="x000000"
1068: plottype="Cartesian"
1069: font="large"
1070: grid="on"
1071: align="center"
1072: border="on"
1073: transparent="on"
1074: alttag="Degree of Discrimination and Degree of Difficulty Plot"
1075: samples="100"
1076: bgcolor="xffffff"
1077: height="$height"
1078: width="$width">
1079: <key
1080: pos="top right"
1081: title=""
1082: box="off" />
1083: <title>$title</title>
1084: <axis xmin="0" ymin="$ymin" xmax="$xmax" ymax="$ymax" color="x000000" />
1085: <xlabel>Problem Number</xlabel>
1086: <curve
1087: linestyle="linespoints"
1088: name="DoDisc"
1089: pointtype="0"
1090: color="x000000">
1091: $discdata
1092: </curve>
1093: <curve
1094: linestyle="linespoints"
1095: name="DoDiff"
1096: pointtype="0"
1097: color="xFF0000">
1098: $diffdata
1099: </curve>
1100: </gnuplot>
1101: END
1102: my $plotresult =
1103: '<p>'.&Apache::lonxml::xmlparse($r,'web',$plot).'</p>'.$/;
1104: $r->print($plotresult);
1105: return;
1106: }
1107:
1108: sub tries_data_plot {
1109: my ($r)=@_;
1110: my $count = scalar(@StatsArray);
1111: my $width = 50 + 10*$count;
1112: $width = 300 if ($width < 300);
1113: my $height = 300;
1114: my $plot = '';
1115: my @STD; my @Mean; my @Max; my @Min;
1116: my @Labels;
1117: my $ymax = 5;
1118: foreach my $data (@StatsArray) {
1119: my $max = $data->{'mean_tries'} + $data->{'std_tries'};
1120: $ymax = $max if ($ymax < $max);
1121: $ymax = $max if ($ymax < $max);
1122: push(@Labels,$data->{'problem_num'});
1123: push(@STD,$data->{'std_tries'});
1124: push(@Mean,$data->{'mean_tries'});
1125: }
1126: #
1127: # Make sure we show relevant information.
1128: my $xmax = $Labels[-1];
1129: if ($xmax > 50) {
1130: if ($xmax % 10 != 0) {
1131: $xmax = 10 * (int($xmax/10)+1);
1132: }
1133: } else {
1134: if ($xmax % 5 != 0) {
1135: $xmax = 5 * (int($xmax/5)+1);
1136: }
1137: }
1138: $ymax = int($ymax)+1+2;
1139: #
1140: my $std_data .= '<data>'.join(',',@Labels).'</data>'.$/.
1141: '<data>'.join(',',@Mean).'</data>'.$/;
1142: #
1143: my $std_error_data .= '<data>'.join(',',@Labels).'</data>'.$/.
1144: '<data>'.join(',',@Mean).'</data>'.$/.
1145: '<data>'.join(',',@STD).'</data>'.$/;
1146: #
1147: my $title = 'Mean and S.D. of Tries';
1148: if ($xmax > 25) {
1149: $title = 'Mean and Standard Deviation of Tries';
1150: }
1151: #
1152: $plot=<<"END";
1153: <gnuplot
1154: texfont="10"
1155: fgcolor="x000000"
1156: plottype="Cartesian"
1157: font="large"
1158: grid="on"
1159: align="center"
1160: border="on"
1161: transparent="on"
1162: alttag="Mean and S.D of Tries Plot"
1163: samples="100"
1164: bgcolor="xffffff"
1165: height="$height"
1166: width="$width">
1167: <title>$title</title>
1168: <axis xmin="0" ymin="0" xmax="$xmax" ymax="$ymax" color="x000000" />
1169: <xlabel>Problem Number</xlabel>
1170: <ylabel>Number of Tries</ylabel>
1171: <curve
1172: linestyle="yerrorbars"
1173: name="S.D. Tries"
1174: pointtype="1"
1175: color="x666666">
1176: $std_error_data
1177: </curve>
1178: <curve
1179: linestyle="points"
1180: name="Mean Tries"
1181: pointtype="1"
1182: color="xCC4444">
1183: $std_data
1184: </curve>
1185: </gnuplot>
1186: END
1187: my $plotresult =
1188: '<p>'.&Apache::lonxml::xmlparse($r,'web',$plot).'</p>'.$/;
1189: $r->print($plotresult);
1190: return;
1191: }
1192:
1193: sub plot_dropdown {
1194: my $current = '';
1195: #
1196: if (defined($ENV{'form.plot'})) {
1197: $current = $ENV{'form.plot'};
1198: }
1199: #
1200: my @Additional_Plots = (
1201: { graphable=>'yes',
1202: name => 'degrees',
1203: title => 'Difficulty Indexes' },
1204: { graphable=>'yes',
1205: name => 'tries statistics',
1206: title => 'Tries Statistics' });
1207: #
1208: my $Str= "\n".'<select name="plot" size="1">';
1209: $Str .= '<option name="none"></option>'."\n";
1210: $Str .= '<option name="none2">none</option>'."\n";
1211: foreach my $field (@Additional_Plots,@Fields) {
1212: if (! exists($field->{'graphable'}) ||
1213: $field->{'graphable'} ne 'yes') {
1214: next;
1215: }
1216: $Str .= '<option value="'.$field->{'name'}.'"';
1217: if ($field->{'name'} eq $current) {
1218: $Str .= ' selected ';
1219: }
1220: $Str.= '>'.&mt($field->{'title'}).'</option>'."\n";
1221: }
1222: $Str .= '</select>'."\n";
1223: return $Str;
1224: }
1225:
1226: ###############################################
1227: ###############################################
1228: ##
1229: ## Excel output routines
1230: ##
1231: ###############################################
1232: ###############################################
1233: sub Excel_output {
1234: my ($r) = @_;
1235: $r->print('<h2>'.&mt('Preparing Excel Spreadsheet').'</h2>');
1236: ##
1237: ## Compute the statistics
1238: &compute_all_statistics($r);
1239: my $c = $r->connection;
1240: return if ($c->aborted());
1241: ##
1242: ## Create the excel workbook
1243: my $filename = '/prtspool/'.
1244: $ENV{'user.name'}.'_'.$ENV{'user.domain'}.'_'.
1245: time.'_'.rand(1000000000).'.xls';
1246: my ($starttime,$endtime) = &Apache::lonstathelpers::get_time_limits();
1247: #
1248: # Create sheet
1249: my $excel_workbook = Spreadsheet::WriteExcel->new('/home/httpd'.$filename);
1250: #
1251: # Check for errors
1252: if (! defined($excel_workbook)) {
1253: $r->log_error("Error creating excel spreadsheet $filename: $!");
1254: $r->print(&mt("Problems creating new Excel file. ".
1255: "This error has been logged. ".
1256: "Please alert your LON-CAPA administrator."));
1257: return 0;
1258: }
1259: #
1260: # The excel spreadsheet stores temporary data in files, then put them
1261: # together. If needed we should be able to disable this (memory only).
1262: # The temporary directory must be specified before calling 'addworksheet'.
1263: # File::Temp is used to determine the temporary directory.
1264: $excel_workbook->set_tempdir($Apache::lonnet::tmpdir);
1265: #
1266: # Add a worksheet
1267: my $sheetname = $ENV{'course.'.$ENV{'request.course.id'}.'.description'};
1268: if (length($sheetname) > 31) {
1269: $sheetname = substr($sheetname,0,31);
1270: }
1271: my $excel_sheet = $excel_workbook->addworksheet(
1272: &Apache::loncommon::clean_excel_name($sheetname));
1273: #
1274: my $format = &Apache::loncommon::define_excel_formats($excel_workbook);
1275: ##
1276: ## Begin creating excel sheet
1277: ##
1278: my ($rows_output,$cols_output) = (0,0);
1279: #
1280: # Put the course description in the header
1281: $excel_sheet->write($rows_output,$cols_output++,
1282: $ENV{'course.'.$ENV{'request.course.id'}.'.description'},
1283: $format->{'h1'});
1284: $cols_output += 3;
1285: #
1286: # Put a description of the sections listed
1287: my $sectionstring = '';
1288: $excel_sheet->write($rows_output,$cols_output++,
1289: &Apache::lonstathelpers::sections_description
1290: (@Apache::lonstatistics::SelectedSections),
1291: $format->{'h3'});
1292: $cols_output += scalar(@Apache::lonstatistics::SelectedSections);
1293: #
1294: # Time restrictions
1295: my $time_string;
1296: if (defined($starttime)) {
1297: # call localtime but not lonlocal:locallocaltime because excel probably
1298: # cannot handle localized text. Probably.
1299: $time_string .= 'Data collected from '.localtime($time_string);
1300: if (defined($endtime)) {
1301: $time_string .= ' to '.localtime($endtime);
1302: }
1303: $time_string .= '.';
1304: } elsif (defined($endtime)) {
1305: # See note above about lonlocal:locallocaltime
1306: $time_string .= 'Data collected before '.localtime($endtime).'.';
1307: }
1308: if (defined($time_string)) {
1309: $excel_sheet->write($rows_output,$cols_output++,$time_string);
1310: $cols_output+= 5;
1311: }
1312: #
1313: # Put the date in there too
1314: $excel_sheet->write($rows_output,$cols_output++,
1315: 'Compiled on '.localtime(time));
1316: #
1317: $rows_output++;
1318: $cols_output=0;
1319: ##
1320: ## Sequence Statistics
1321: ##
1322: &write_headers($excel_sheet,$format,\$rows_output,\$cols_output,
1323: \@SeqFields);
1324: foreach my $seq (&Apache::lonstatistics::Sequences_with_Assess()) {
1325: next if ($seq->{'num_assess'} < 1);
1326: my $data = $SeqStat{$seq->{'symb'}};
1327: $cols_output=0;
1328: foreach my $field (@SeqFields) {
1329: next if ($field->{'selected'} ne 'yes');
1330: my $fieldformat = undef;
1331: if (exists($field->{'excel_format'})) {
1332: $fieldformat = $format->{$field->{'excel_format'}};
1333: }
1334: $excel_sheet->write($rows_output,$cols_output++,
1335: $data->{$field->{'name'}},$fieldformat);
1336: }
1337: $rows_output++;
1338: $cols_output=0;
1339: }
1340: ##
1341: ## Resource Statistics
1342: ##
1343: $rows_output++;
1344: $cols_output=0;
1345: &write_headers($excel_sheet,$format,\$rows_output,\$cols_output,
1346: \@Fields);
1347: #
1348: foreach my $data (@StatsArray) {
1349: $cols_output=0;
1350: foreach my $field (@Fields) {
1351: next if ($field->{'selected'} ne 'yes');
1352: next if ($field->{'name'} eq 'problem_num');
1353: my $fieldformat = undef;
1354: if (exists($field->{'excel_format'})) {
1355: $fieldformat = $format->{$field->{'excel_format'}};
1356: }
1357: $excel_sheet->write($rows_output,$cols_output++,
1358: $data->{$field->{'name'}},$fieldformat);
1359: }
1360: $rows_output++;
1361: $cols_output=0;
1362: }
1363: #
1364: $excel_workbook->close();
1365: #
1366: # Tell the user where to get their excel file
1367: $r->print('<br />'.
1368: '<a href="'.$filename.'">'.
1369: &mt('Your Excel Spreadsheet').'</a>'."\n");
1370: $r->rflush();
1371: return;
1372: }
1373:
1374: ##
1375: ## &write_headers
1376: ##
1377: sub write_headers {
1378: my ($excel_sheet,$format,$rows_output,$cols_output,$Fields) = @_;
1379: ##
1380: ## First the long titles
1381: foreach my $field (@{$Fields}) {
1382: next if ($field->{'name'} eq 'problem_num');
1383: next if ($field->{'selected'} ne 'yes');
1384: if (exists($field->{'long_title'})) {
1385: $excel_sheet->write($$rows_output,${$cols_output},
1386: $field->{'long_title'},
1387: $format->{'bold'});
1388: } else {
1389: $excel_sheet->write($$rows_output,${$cols_output},'');
1390: }
1391: ${$cols_output}+= 1;
1392: }
1393: ${$cols_output} =0;
1394: ${$rows_output}+=1;
1395: ##
1396: ## Then the short titles
1397: foreach my $field (@{$Fields}) {
1398: next if ($field->{'selected'} ne 'yes');
1399: next if ($field->{'name'} eq 'problem_num');
1400: # Use english for excel as I am not sure how well excel handles
1401: # other character sets....
1402: $excel_sheet->write($$rows_output,$$cols_output,
1403: $field->{'title'},
1404: $format->{'bold'});
1405: $$cols_output+=1;
1406: }
1407: ${$cols_output} =0;
1408: ${$rows_output}+=1;
1409: return;
1410: }
1411:
1412: ##################################################
1413: ##################################################
1414: ##
1415: ## Statistics Gathering and Manipulation Routines
1416: ##
1417: ##################################################
1418: ##################################################
1419: sub compute_statistics_on_sequence {
1420: my ($seq) = @_;
1421: my @Data;
1422: foreach my $res (@{$seq->{'contents'}}) {
1423: next if ($res->{'type'} ne 'assessment');
1424: foreach my $part (@{$res->{'parts'}}) {
1425: next if ($res->{'partdata'}->{$part}->{'Survey'});
1426: #
1427: # This is where all the work happens
1428: my $data = &get_statistics($seq,$res,$part,scalar(@StatsArray)+1);
1429: push (@Data,$data);
1430: push (@StatsArray,$data);
1431: }
1432: }
1433: return @Data;
1434: }
1435:
1436: sub compute_all_statistics {
1437: my ($r) = @_;
1438: if (@StatsArray > 0) {
1439: # Assume we have already computed the statistics
1440: return;
1441: }
1442: my $c = $r->connection;
1443: foreach my $seq (&Apache::lonstatistics::Sequences_with_Assess()) {
1444: last if ($c->aborted);
1445: next if ($seq->{'num_assess'} < 1);
1446: &compute_sequence_statistics($seq);
1447: &compute_statistics_on_sequence($seq);
1448: }
1449: }
1450:
1451: sub sort_data {
1452: my ($sortkey) = @_;
1453: return if (! @StatsArray);
1454: #
1455: # Sort the data
1456: my $sortby = undef;
1457: foreach my $field (@Fields) {
1458: if ($sortkey eq $field->{'name'}) {
1459: $sortby = $field->{'name'};
1460: }
1461: }
1462: if (! defined($sortby) || $sortby eq '' || $sortby eq 'problem_num') {
1463: $sortby = 'container';
1464: }
1465: if ($sortby ne 'container') {
1466: # $sortby is already defined, so we can charge ahead
1467: if ($sortby =~ /^(title|part)$/i) {
1468: # Alpha comparison
1469: @StatsArray = sort {
1470: lc($a->{$sortby}) cmp lc($b->{$sortby}) ||
1471: lc($a->{'title'}) cmp lc($b->{'title'}) ||
1472: lc($a->{'part'}) cmp lc($b->{'part'});
1473: } @StatsArray;
1474: } else {
1475: # Numerical comparison
1476: @StatsArray = sort {
1477: my $retvalue = 0;
1478: if ($b->{$sortby} eq 'nan') {
1479: if ($a->{$sortby} ne 'nan') {
1480: $retvalue = -1;
1481: } else {
1482: $retvalue = 0;
1483: }
1484: }
1485: if ($a->{$sortby} eq 'nan') {
1486: if ($b->{$sortby} ne 'nan') {
1487: $retvalue = 1;
1488: }
1489: }
1490: if ($retvalue eq '0') {
1491: $retvalue = $b->{$sortby} <=> $a->{$sortby} ||
1492: lc($a->{'title'}) <=> lc($b->{'title'}) ||
1493: lc($a->{'part'}) <=> lc($b->{'part'});
1494: }
1495: $retvalue;
1496: } @StatsArray;
1497: }
1498: }
1499: #
1500: # Renumber the data set
1501: my $count;
1502: foreach my $data (@StatsArray) {
1503: $data->{'problem_num'} = ++$count;
1504: }
1505: return;
1506: }
1507:
1508: ########################################################
1509: ########################################################
1510:
1511: =pod
1512:
1513: =item &get_statistics()
1514:
1515: Wrapper routine from the call to loncoursedata::get_problem_statistics.
1516: Calls lonstathelpers::get_time_limits() to limit the data set by time
1517: and &compute_discrimination_factor
1518:
1519: Inputs: $sequence, $resource, $part, $problem_num
1520:
1521: Returns: Hash reference with statistics data from
1522: loncoursedata::get_problem_statistics.
1523:
1524: =cut
1525:
1526: ########################################################
1527: ########################################################
1528: sub get_statistics {
1529: my ($sequence,$resource,$part,$problem_num) = @_;
1530: #
1531: my ($starttime,$endtime) = &Apache::lonstathelpers::get_time_limits();
1532: my $symb = $resource->{'symb'};
1533: my $courseid = $ENV{'request.course.id'};
1534: #
1535: my $data = &Apache::loncoursedata::get_problem_statistics
1536: (\@Apache::lonstatistics::SelectedSections,
1537: $Apache::lonstatistics::enrollment_status,
1538: $symb,$part,$courseid,$starttime,$endtime);
1539: $data->{'symb'} = $symb;
1540: $data->{'part'} = $part;
1541: $data->{'problem_num'} = $problem_num;
1542: $data->{'container'} = $sequence->{'title'};
1543: $data->{'title'} = $resource->{'title'};
1544: $data->{'title.link'} = $resource->{'src'}.'?symb='.
1545: &Apache::lonnet::escape($resource->{'symb'});
1546: #
1547: if ($SelectedFields{'deg_of_disc'}) {
1548: $data->{'deg_of_disc'} =
1549: &compute_discrimination_factor($resource,$part,$sequence);
1550: }
1551: #
1552: # Store in metadata if computations were done for all students
1553: if ($data->{'num_students'} > 1) {
1554: my @Sections = @Apache::lonstatistics::SelectedSections;
1555: my $sections = '"'.join(' ',@Sections).'"';
1556: $sections =~ s/&+/_/g; # Ensure no special characters
1557: $data->{'sections'}=$sections;
1558: $data->{'course'} = $ENV{'request.course.id'};
1559: my $urlres=(&Apache::lonnet::decode_symb($resource->{'symb'}))[2];
1560: $data->{'urlres'}=$urlres;
1561: my %storestats =
1562: &LONCAPA::lonmetadata::dynamic_metadata_storage($data);
1563: my ($dom,$user) = $urlres=~/^(\w+)\/(\w+)/;
1564: &Apache::lonnet::put('nohist_resevaldata',\%storestats,$dom,$user);
1565: }
1566: #
1567: # Get the due date for research purposes (commented out most of the time)
1568: # $data->{'duedate'} =
1569: # &Apache::lonnet::EXT('resource.'.$part.'.duedate',$symb);
1570: # $data->{'opendate'} =
1571: # &Apache::lonnet::EXT('resource.'.$part.'.opendate',$symb);
1572: # $data->{'maxtries'} =
1573: # &Apache::lonnet::EXT('resource.'.$part.'.maxtries',$symb);
1574: # $data->{'hinttries'} =
1575: # &Apache::lonnet::EXT('resource.'.$part.'.hinttries',$symb);
1576: # $data->{'resptypes'} = join(',',@{$resource->{'partdata'}->{$part}->{'ResponseTypes'}});
1577: return $data;
1578: }
1579:
1580: ###############################################
1581: ###############################################
1582:
1583: =pod
1584:
1585: =item &compute_discrimination_factor()
1586:
1587: Inputs: $Resource, $Sequence
1588:
1589: Returns: integer between -1 and 1
1590:
1591: =cut
1592:
1593: ###############################################
1594: ###############################################
1595: sub compute_discrimination_factor {
1596: my ($resource,$part,$sequence) = @_;
1597: my @Resources;
1598: foreach my $res (@{$sequence->{'contents'}}) {
1599: next if ($res->{'symb'} eq $resource->{'symb'});
1600: push (@Resources,$res->{'symb'});
1601: }
1602: #
1603: # rank
1604: my ($starttime,$endtime) = &Apache::lonstathelpers::get_time_limits();
1605: my $ranking =
1606: &Apache::loncoursedata::rank_students_by_scores_on_resources
1607: (\@Resources,
1608: \@Apache::lonstatistics::SelectedSections,
1609: $Apache::lonstatistics::enrollment_status,undef,
1610: $starttime,$endtime);
1611: #
1612: # compute their percent scores on the problems in the sequence,
1613: my $number_to_grab = int(scalar(@{$ranking})/4);
1614: my $num_students = scalar(@{$ranking});
1615: my @BottomSet = map { $_->[&Apache::loncoursedata::RNK_student()];
1616: } @{$ranking}[0..$number_to_grab];
1617: my @TopSet =
1618: map {
1619: $_->[&Apache::loncoursedata::RNK_student()];
1620: } @{$ranking}[($num_students-$number_to_grab)..($num_students-1)];
1621: if (! @BottomSet || (@BottomSet == 1 && $BottomSet[0] eq '') ||
1622: ! @TopSet || (@TopSet == 1 && $TopSet[0] eq '')) {
1623: return 'nan';
1624: }
1625: my ($bottom_sum,$bottom_max) =
1626: &Apache::loncoursedata::get_sum_of_scores($resource,$part,\@BottomSet,
1627: undef,$starttime,$endtime);
1628: my ($top_sum,$top_max) =
1629: &Apache::loncoursedata::get_sum_of_scores($resource,$part,\@TopSet,
1630: undef,$starttime,$endtime);
1631: my $deg_of_disc;
1632: if ($top_max == 0 || $bottom_max==0) {
1633: $deg_of_disc = 'nan';
1634: } else {
1635: $deg_of_disc = ($top_sum/$top_max) - ($bottom_sum/$bottom_max);
1636: }
1637: #&Apache::lonnet::logthis(' '.$top_sum.'/'.$top_max.
1638: # ' - '.$bottom_sum.'/'.$bottom_max);
1639: return $deg_of_disc;
1640: }
1641:
1642: ###############################################
1643: ###############################################
1644: ##
1645: ## Compute KR-21
1646: ##
1647: ## To compute KR-21, you need the following information:
1648: ##
1649: ## K=the number of items in your test
1650: ## M=the mean score on the test
1651: ## s=the standard deviation of the scores on your test
1652: ##
1653: ## then:
1654: ##
1655: ## KR-21 rk= [K/(K-1)] * [1- (M*(K-M))/(K*s^2))]
1656: ##
1657: ###############################################
1658: ###############################################
1659: sub compute_sequence_statistics {
1660: my ($seq) = @_;
1661: my $symb = $seq->{'symb'};
1662: my @Resources;
1663: foreach my $res (@{$seq->{'contents'}}) {
1664: next if ($res->{'type'} ne 'assessment');
1665: push (@Resources,$res->{'symb'});
1666: }
1667: my ($starttime,$endtime) = &Apache::lonstathelpers::get_time_limits();
1668: #
1669: # First compute statistics based on student scores
1670: my ($smin,$smax,$sMean,$sSTD,$scount,$sMAX) =
1671: &Apache::loncoursedata::score_stats
1672: (\@Apache::lonstatistics::SelectedSections,
1673: $Apache::lonstatistics::enrollment_status,
1674: \@Resources,$starttime,$endtime,undef);
1675: $SeqStat{$symb}->{'title'} = $seq->{'title'};
1676: $SeqStat{$symb}->{'scoremax'} = $smax;
1677: $SeqStat{$symb}->{'scoremin'} = $smin;
1678: $SeqStat{$symb}->{'scoremean'} = $sMean;
1679: $SeqStat{$symb}->{'scorestd'} = $sSTD;
1680: $SeqStat{$symb}->{'scorecount'} = $scount;
1681: $SeqStat{$symb}->{'max_possible'} = $sMAX;
1682: #
1683: # Compute statistics based on the number of correct problems
1684: # 'correct' is taken to mean
1685: my ($cmin,$cmax,$cMean,$cSTD,$ccount)=
1686: &Apache::loncoursedata::count_stats
1687: (\@Apache::lonstatistics::SelectedSections,
1688: $Apache::lonstatistics::enrollment_status,
1689: \@Resources,$starttime,$endtime,undef);
1690: my $K = $seq->{'num_assess_parts'};
1691: my $kr_21;
1692: if ($K > 1 && $cSTD > 0) {
1693: $kr_21 = ($K/($K-1)) * (1 - $cMean*($K-$cMean)/($K*$cSTD**2));
1694: } else {
1695: $kr_21 = 'nan';
1696: }
1697: $SeqStat{$symb}->{'countmax'} = $cmax;
1698: $SeqStat{$symb}->{'countmin'} = $cmin;
1699: $SeqStat{$symb}->{'countstd'} = $cSTD;
1700: $SeqStat{$symb}->{'countmean'} = $cMean;
1701: $SeqStat{$symb}->{'count'} = $ccount;
1702: $SeqStat{$symb}->{'items'} = $K;
1703: $SeqStat{$symb}->{'KR-21'}=$kr_21;
1704: return;
1705: }
1706:
1707:
1708:
1709: =pod
1710:
1711: =item ProblemStatisticsLegend
1712:
1713: =over 4
1714:
1715: =item #Stdnts
1716: Total number of students attempted the problem.
1717:
1718: =item Tries
1719: Total number of tries for solving the problem.
1720:
1721: =item Max Tries
1722: Largest number of tries for solving the problem by a student.
1723:
1724: =item Mean
1725: Average number of tries. [ Tries / #Stdnts ]
1726:
1727: =item #YES
1728: Number of students solved the problem correctly.
1729:
1730: =item #yes
1731: Number of students solved the problem by override.
1732:
1733: =item %Wrong
1734: Percentage of students who tried to solve the problem
1735: but is still incorrect. [ 100*((#Stdnts-(#YES+#yes))/#Stdnts) ]
1736:
1737: =item DoDiff
1738: Degree of Difficulty of the problem.
1739: [ 1 - ((#YES+#yes) / Tries) ]
1740:
1741: =item S.D.
1742: Standard Deviation of the tries.
1743: [ sqrt(sum((Xi - Mean)^2)) / (#Stdnts-1)
1744: where Xi denotes every student\'s tries ]
1745:
1746: =item Skew.
1747: Skewness of the students tries.
1748: [(sqrt( sum((Xi - Mean)^3) / #Stdnts)) / (S.D.^3)]
1749:
1750: =item Dis.F.
1751: Discrimination Factor: A Standard for evaluating the
1752: problem according to a Criterion<br>
1753:
1754: =item [Criterion to group students into %27 Upper Students -
1755: and %27 Lower Students]
1756: 1st Criterion for Sorting the Students:
1757: Sum of Partial Credit Awarded / Total Number of Tries
1758: 2nd Criterion for Sorting the Students:
1759: Total number of Correct Answers / Total Number of Tries
1760:
1761: =item Disc.
1762: Number of Students had at least one discussion.
1763:
1764: =back
1765:
1766: =cut
1767:
1768: ############################################################
1769: ############################################################
1770:
1771: 1;
1772: __END__
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