File:
[LON-CAPA] /
loncom /
interface /
statistics /
lonproblemstatistics.pm
Revision
1.105:
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Fri Aug 26 21:53:23 2005 UTC (18 years, 10 months ago) by
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- some stat reports were not cleaningup the navmap cglobal which menat the course hashes weren't untied
1: # The LearningOnline Network with CAPA
2: #
3: # $Id: lonproblemstatistics.pm,v 1.105 2005/08/26 21:53:23 albertel 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 => 'tries_per_correct',
235: title => 'tries/correct',
236: align => 'right',
237: color => '#FFDDDD',
238: format => '%4.1f',
239: sortable => 'yes',
240: graphable => 'yes',
241: long_title => 'Tries per Correct Answer',
242: selectable => 'yes',
243: defaultselected => 'yes',
244: },
245: { name => 'num_wrong',
246: title => '#Wrng',
247: align => 'right',
248: color => '#FFDDDD',
249: format => '%4.1f',
250: sortable => 'yes',
251: graphable => 'yes',
252: long_title => 'Number of students whose final answer is wrong',
253: selectable => 'yes',
254: defaultselected => 'yes',
255: },
256: { name => 'per_wrong',
257: title => '%Wrng',
258: align => 'right',
259: color => '#FFDDDD',
260: format => '%4.1f',
261: sortable => 'yes',
262: graphable => 'yes',
263: long_title => 'Percent of students whose final answer is wrong',
264: selectable => 'yes',
265: defaultselected => 'yes',
266: },
267: { name => 'deg_of_diff',
268: title => 'DoDiff',
269: align => 'right',
270: color => '#FFFFE6',
271: format => '%5.2f',
272: sortable => 'yes',
273: graphable => 'yes',
274: long_title => 'Degree of Difficulty'.
275: '[ 1 - ((#YES+#yes) / Tries) ]',
276: selectable => 'yes',
277: defaultselected => 'yes',
278: },
279: { name => 'deg_of_disc',
280: title => 'DoDisc',
281: align => 'right',
282: color => '#FFFFE6',
283: format => '%4.2f',
284: sortable => 'yes',
285: graphable => 'yes',
286: long_title => 'Degree of Discrimination',
287: selectable => 'yes',
288: defaultselected => 'yes',
289: },
290: ## duedate included for research purposes. Commented out most of the time.
291: # { name => 'duedate',
292: # title => 'Due Date',
293: # align => 'left',
294: # color => '#FFFFFF',
295: # sortable => 'yes',
296: # graphable => 'no',
297: # long_title => 'Due date of resource for instructor',
298: # selectable => 'no',
299: # defaultselected => 'yes',
300: # },
301: ## opendate included for research purposes. Commented out most of the time.
302: # { name => 'opendate',
303: # title => 'Open Date',
304: # align => 'left',
305: # color => '#FFFFFF',
306: # sortable => 'yes',
307: # graphable => 'no',
308: # long_title => 'date resource became answerable',
309: # selectable => 'no',
310: # defaultselected => 'yes',
311: # },
312: ## symb included for research purposes. Commented out most of the time.
313: # { name => 'symb',
314: # title => 'Symb',
315: # align => 'left',
316: # color => '#FFFFFF',
317: # sortable => 'yes',
318: # graphable => 'no',
319: # long_title => 'Unique LON-CAPA identifier for problem',
320: # selectable => 'no',
321: # defaultselected => 'yes',
322: # },
323: ## resptypes included for research purposes. Commented out most of the time.
324: # { name => 'resptypes',
325: # title => 'Response Types',
326: # align => 'left',
327: # color => '#FFFFFF',
328: # sortable => 'no',
329: # graphable => 'no',
330: # long_title => 'Response Types used in this problem',
331: # selectable => 'no',
332: # defaultselected => 'yes',
333: # },
334: ## maxtries included for research purposes. Commented out most of the time.
335: # { name => 'maxtries',
336: # title => 'Maxtries',
337: # align => 'left',
338: # color => '#FFFFFF',
339: # sortable => 'no',
340: # graphable => 'no',
341: # long_title => 'Maximum number of tries',
342: # selectable => 'no',
343: # defaultselected => 'yes',
344: # },
345: ## hinttries included for research purposes. Commented out most of the time.
346: # { name => 'hinttries',
347: # title => 'hinttries',
348: # align => 'left',
349: # color => '#FFFFFF',
350: # sortable => 'no',
351: # graphable => 'no',
352: # long_title => 'Number of tries before a hint appears',
353: # selectable => 'no',
354: # defaultselected => 'yes',
355: # },
356: #
357: ## problem weight for instructor
358: { name => 'weight',
359: title => 'weight',
360: align => 'right',
361: color => '#FFFFFF',
362: sortable => 'no',
363: graphable => 'no',
364: long_title => 'Problem weight (for instructor)',
365: selectable => 'yes',
366: defaultselected => 'yes',
367: },
368: );
369:
370: my @SeqFields = (
371: { name => 'title',
372: title => 'Sequence',
373: align => 'left',
374: color => '#FFFFE6',
375: special => 'no',
376: sortable => 'no',
377: selectable => 'yes',
378: defaultselected => 'no',
379: },
380: { name => 'items',
381: title => '#Items',
382: align => 'right',
383: color => '#FFFFE6',
384: format => '%4d',
385: sortable => 'no',
386: graphable => 'no',
387: long_title => 'Number of Items in Sequence',
388: selectable => 'yes',
389: defaultselected => 'no',
390: },
391: { name => 'scoremean',
392: title => 'Score Mean',
393: align => 'right',
394: color => '#FFFFE6',
395: format => '%4.2f',
396: sortable => 'no',
397: graphable => 'no',
398: long_title => 'Mean Sequence Score',
399: selectable => 'yes',
400: defaultselected => 'no',
401: },
402: { name => 'scorestd',
403: title => 'Score STD',
404: align => 'right',
405: color => '#FFFFE6',
406: format => '%4.2f',
407: sortable => 'no',
408: graphable => 'no',
409: long_title => 'Standard Deviation of Sequence Scores',
410: selectable => 'yes',
411: defaultselected => 'no',
412: },
413: { name => 'scoremax',
414: title => 'Score Max',
415: align => 'right',
416: color => '#FFFFE6',
417: format => '%4.2f',
418: sortable => 'no',
419: graphable => 'no',
420: long_title => 'Maximum Sequence Score',
421: selectable => 'yes',
422: defaultselected => 'no',
423: },
424: { name => 'scoremin',
425: title => 'Score Min',
426: align => 'right',
427: color => '#FFFFE6',
428: format => '%4.2f',
429: sortable => 'no',
430: graphable => 'no',
431: long_title => 'Minumum Sequence Score',
432: selectable => 'yes',
433: defaultselected => 'no',
434: },
435: { name => 'scorecount',
436: title => 'Score N',
437: align => 'right',
438: color => '#FFFFE6',
439: format => '%4d',
440: sortable => 'no',
441: graphable => 'no',
442: long_title => 'Number of Students in score computations',
443: selectable => 'yes',
444: defaultselected => 'no',
445: },
446: { name => 'countmean',
447: title => 'Count Mean',
448: align => 'right',
449: color => '#FFFFFF',
450: format => '%4.2f',
451: sortable => 'no',
452: graphable => 'no',
453: long_title => 'Mean Sequence Score',
454: selectable => 'yes',
455: defaultselected => 'no',
456: },
457: { name => 'countstd',
458: title => 'Count STD',
459: align => 'right',
460: color => '#FFFFFF',
461: format => '%4.2f',
462: sortable => 'no',
463: graphable => 'no',
464: long_title => 'Standard Deviation of Sequence Scores',
465: selectable => 'yes',
466: defaultselected => 'no',
467: },
468: { name => 'countmax',
469: title => 'Count Max',
470: align => 'right',
471: color => '#FFFFFF',
472: format => '%4.2f',
473: sortable => 'no',
474: graphable => 'no',
475: long_title => 'Maximum Number of Correct Problems',
476: selectable => 'yes',
477: defaultselected => 'no',
478: },
479: { name => 'countmin',
480: title => 'Count Min',
481: align => 'right',
482: color => '#FFFFFF',
483: format => '%4.2f',
484: sortable => 'no',
485: graphable => 'no',
486: long_title => 'Minumum Number of Correct Problems',
487: selectable => 'yes',
488: defaultselected => 'no',
489: },
490: { name => 'count',
491: title => 'Count N',
492: align => 'right',
493: color => '#FFFFFF',
494: format => '%4d',
495: sortable => 'no',
496: graphable => 'no',
497: long_title => 'Number of Students in score computations',
498: selectable => 'yes',
499: defaultselected => 'no',
500: },
501: { name => 'KR-21',
502: title => 'KR-21',
503: align => 'right',
504: color => '#FFAAAA',
505: format => '%4.2f',
506: sortable => 'no',
507: graphable => 'no',
508: long_title => 'KR-21 reliability statistic',
509: selectable => 'yes',
510: defaultselected => 'no',
511: },
512: );
513:
514: my %SelectedFields;
515:
516: sub parse_field_selection {
517: #
518: # Pull out the defaults
519: if (! defined($env{'form.fieldselections'})) {
520: $env{'form.fieldselections'} = [];
521: foreach my $field (@Fields) {
522: next if ($field->{'selectable'} ne 'yes');
523: if ($field->{'defaultselected'} eq 'yes') {
524: push(@{$env{'form.fieldselections'}},$field->{'name'});
525: }
526: }
527: }
528: #
529: # Make sure the data we are plotting is there
530: my %NeededFields;
531: if (exists($env{'form.plot'}) && $env{'form.plot'} ne '' &&
532: $env{'form.plot'} ne 'none') {
533: if ($env{'form.plot'} eq 'degrees') {
534: $NeededFields{'deg_of_diff'}++;
535: $NeededFields{'deg_of_disc'}++;
536: } elsif ($env{'form.plot'} eq 'tries statistics') {
537: $NeededFields{'mean_tries'}++;
538: $NeededFields{'std_tries'}++;
539: $NeededFields{'problem_num'}++;
540: } else {
541: $NeededFields{$env{'form.plot'}}++;
542: }
543: }
544: #
545: # This should not happen, but in case it does...
546: if (ref($env{'form.fieldselections'}) ne 'ARRAY') {
547: $env{'form.fieldselections'} = [$env{'form.fieldselections'}];
548: }
549: #
550: # Set the field data and the selected fields (for easier checking)
551: undef(%SelectedFields);
552: foreach my $field (@Fields) {
553: if ($field->{'selectable'} ne 'yes') {
554: $field->{'selected'} = 'yes';
555: } else {
556: $field->{'selected'} = 'no';
557: }
558: if (exists($NeededFields{$field->{'name'}})) {
559: $field->{'selected'} = 'yes';
560: $SelectedFields{$field->{'name'}}++;
561: }
562: foreach my $selection (@{$env{'form.fieldselections'}}) {
563: if ($selection eq $field->{'name'} || $selection eq 'all') {
564: $field->{'selected'} = 'yes';
565: $SelectedFields{$field->{'name'}}++;
566: }
567: }
568: }
569: #
570: # Always show all the sequence statistics (for now)
571: foreach my $field (@SeqFields) {
572: $field->{'selected'} = 'yes';
573: }
574: return;
575: }
576:
577: sub field_selection_input {
578: my $Str = '<select name="fieldselections" multiple size="5">'."\n";
579: $Str .= '<option value="all">all</option>'."\n";
580: foreach my $field (@Fields) {
581: next if ($field->{'selectable'} ne 'yes');
582: $Str .= ' <option value="'.$field->{'name'}.'" ';
583: if ($field->{'selected'} eq 'yes') {
584: $Str .= 'selected ';
585: }
586: $Str .= '>'.$field->{'title'}.'</option>'."\n";
587: }
588: $Str .= "</select>\n";
589: }
590:
591: ###############################################
592: ###############################################
593:
594: =pod
595:
596: =item &CreateInterface()
597:
598: Create the main intereface for the statistics page. Allows the user to
599: select sections, maps, and output.
600:
601: =cut
602:
603: ###############################################
604: ###############################################
605: sub CreateInterface {
606: my ($r) = @_;
607: #
608: &parse_field_selection();
609: #
610: my $Str = '';
611: $Str .= &Apache::lonhtmlcommon::breadcrumbs
612: (undef,'Overall Problem Statistics','Statistics_Overall_Key');
613: $Str .= '<table cellspacing="5">'."\n";
614: $Str .= '<tr>';
615: $Str .= '<td align="center"><b>'.&mt('Sections').'</b></td>';
616: $Str .= '<td align="center"><b>'.&mt('Enrollment Status').'</b></td>';
617: $Str .= '<td align="center"><b>'.&mt('Sequences and Folders').'</b></td>';
618: $Str .= '<td align="center"><b>'.&mt('Statistics').'</b></td>';
619: $Str .= '<td rowspan="2">'.
620: &Apache::lonstathelpers::limit_by_time_form().'</td>';
621: $Str .= '</tr>'."\n";
622: #
623: $Str .= '<tr><td align="center">'."\n";
624: $Str .= &Apache::lonstatistics::SectionSelect('Section','multiple',5);
625: $Str .= '</td><td align="center">';
626: $Str .= &Apache::lonhtmlcommon::StatusOptions(undef,undef,5);
627: $Str .= '</td><td align="center">';
628: #
629: $Str .= &Apache::lonstatistics::map_select('Maps','multiple,all',5);
630: $Str .= '</td><td>'.&field_selection_input();
631: $Str .= '</td></tr>'."\n";
632: $Str .= '</table>'."\n";
633: #
634: $Str .= '<p>'.&mt('Status: [_1]',
635: '<input type="text" '.
636: 'name="stats_status" size="60" value="" />'
637: ).
638: '</nobr></p>';
639: #
640: $Str .= '<input type="submit" name="GenerateStatistics" value="'.
641: &mt('Generate Statistics').'" />';
642: $Str .= ' 'x5;
643: $Str .= 'Plot '.&plot_dropdown().(' 'x10);
644: #
645: return $Str;
646: }
647:
648: ###############################################
649: ###############################################
650:
651: =pod
652:
653: =item &BuildProblemStatisticsPage()
654:
655: Main interface to problem statistics.
656:
657: =cut
658:
659: ###############################################
660: ###############################################
661: my $navmap;
662: my @sequences;
663:
664: sub clean_up {
665: undef($navmap);
666: undef(@sequences);
667: }
668:
669: sub BuildProblemStatisticsPage {
670: my ($r,$c)=@_;
671: undef($navmap);
672: undef(@sequences);
673: #
674: my %Saveable_Parameters = ('Status' => 'scalar',
675: 'statsoutputmode' => 'scalar',
676: 'Section' => 'array',
677: 'StudentData' => 'array',
678: 'Maps' => 'array',
679: 'fieldselections'=> 'array');
680: &Apache::loncommon::store_course_settings('statistics',
681: \%Saveable_Parameters);
682: &Apache::loncommon::restore_course_settings('statistics',
683: \%Saveable_Parameters);
684: #
685: &Apache::lonstatistics::PrepareClasslist();
686: #
687: # Clear the package variables
688: undef(@StatsArray);
689: undef(%SeqStat);
690: #
691: # Finally let the user know we are here
692: my $interface = &CreateInterface($r);
693: $r->print($interface);
694: $r->print('<input type="hidden" name="sortby" value="'.$env{'form.sortby'}.
695: '" />');
696: #
697: my @CacheButtonHTML =
698: &Apache::lonstathelpers::manage_caches($r,'Statistics','stats_status');
699: my $Str;
700: foreach my $html (@CacheButtonHTML) {
701: $Str.=$html.(' 'x5);
702: }
703: #
704: $r->print($Str);
705: if (! exists($env{'form.firstrun'})) {
706: $r->print('<h3>'.
707: &mt('Press "Generate Statistics" when you are ready.').
708: '</h3><p>'.
709: &mt('It may take some time to update the student data '.
710: 'for the first analysis. Future analysis this session '.
711: ' will not have this delay.').
712: '</p>');
713: &clean_up();
714: return;
715: }
716: $r->rflush();
717: #
718: # This probably does not need to be done each time we are called, but
719: # it does not slow things down noticably.
720: &Apache::loncoursedata::populate_weight_table();
721: #
722: ($navmap,@sequences) =
723: &Apache::lonstatistics::selected_sequences_with_assessments();
724: if (! ref($navmap)) {
725: $r->print('<h1>'.&mt('A course-wide error occured.').'</h1>'.
726: '<h3>'.$navmap.'</h3>');
727: &clean_up();
728: return;
729: }
730: if (exists($env{'form.Excel'})) {
731: $r->print('<h4>'.
732: &Apache::lonstatistics::section_and_enrollment_description().
733: '</h4>');
734: &Excel_output($r);
735: } else {
736: $r->print('<input type="submit" name="Excel" value="'.
737: &mt('Produce Excel Output').'" />'.' 'x5);
738: $r->rflush();
739: $r->print('<h4>'.
740: &Apache::lonstatistics::section_and_enrollment_description().
741: '</h4>');
742: my $count = 0;
743: foreach my $seq (@sequences) {
744: my @resources =
745: &Apache::lonstathelpers::get_resources($navmap,$seq);
746: $count += scalar(@resources);
747: }
748: if ($count > 10) {
749: $r->print('<h2>'.
750: &mt('Compiling statistics for [_1] problems',$count).
751: '</h2>');
752: if ($count > 30) {
753: $r->print('<h3>'.&mt('This will take some time.').'</h3>');
754: }
755: $r->rflush();
756: }
757: #
758: my $sortby = $env{'form.sortby'};
759: $sortby = 'container' if (! defined($sortby) || $sortby =~ /^\s*$/);
760: my $plot = $env{'form.plot'};
761: if ($plot eq '' || $plot eq 'none') {
762: undef($plot);
763: }
764: if ($sortby eq 'container' && ! defined($plot)) {
765: &output_sequence_statistics($r);
766: &output_html_by_sequence($r);
767: } else {
768: if (defined($plot)) {
769: &make_plot($r,$plot);
770: }
771: &output_html_stats($r);
772: &output_sequence_statistics($r);
773: }
774: }
775: &clean_up();
776: return;
777: }
778:
779: sub output_sequence_statistics {
780: my ($r) = @_;
781: my $c=$r->connection();
782: $r->print('<h2>'.&mt('Sequence Statistics').
783: &Apache::loncommon::help_open_topic('Statistics_Sequence').
784: '</h2>');
785: $r->print('<table border="0"><tr><td bgcolor="#777777">'."\n".
786: '<table border="0" cellpadding="3">'."\n".
787: '<tr bgcolor="#FFFFE6">');
788: $r->print(&sequence_html_header());
789: foreach my $seq (@sequences) {
790: last if ($c->aborted);
791: &compute_sequence_statistics($seq);
792: $r->print(&sequence_html_output($seq));
793: }
794: $r->print('</table>');
795: $r->print('</table>');
796: $r->rflush();
797: return;
798: }
799:
800:
801: ##########################################################
802: ##########################################################
803: ##
804: ## HTML output routines
805: ##
806: ##########################################################
807: ##########################################################
808: sub output_html_by_sequence {
809: my ($r) = @_;
810: my $c = $r->connection();
811: $r->print(&html_preamble());
812: #
813: foreach my $seq (@sequences) {
814: last if ($c->aborted);
815: $r->print("<h3>".$seq->compTitle."</h3>".
816: '<table border="0"><tr><td bgcolor="#777777">'."\n".
817: '<table border="0" cellpadding="3">'."\n".
818: '<tr bgcolor="#FFFFE6">'.
819: &statistics_table_header('no container')."</tr>\n");
820: my @Data = &compute_statistics_on_sequence($seq);
821: foreach my $data (@Data) {
822: $r->print('<tr>'.&statistics_html_table_data($data,
823: 'no container').
824: "</tr>\n");
825: }
826: $r->print('</table>'."\n".'</table>'."\n");
827: $r->rflush();
828: }
829: return;
830: }
831:
832: sub output_html_stats {
833: my ($r)=@_;
834: &compute_all_statistics($r);
835: $r->print(&html_preamble());
836: &sort_data($env{'form.sortby'});
837: #
838: my $count=0;
839: foreach my $data (@StatsArray) {
840: if ($count++ % 50 == 0) {
841: $r->print("</table>\n</table>\n");
842: $r->print('<table border="0"><tr><td bgcolor="#777777">'."\n".
843: '<table border="0" cellpadding="3">'."\n".
844: '<tr bgcolor="#FFFFE6">'.
845: '<tr bgcolor="#FFFFE6">'.
846: &statistics_table_header().
847: "</tr>\n");
848: }
849: $r->print('<tr>'.&statistics_html_table_data($data)."</tr>\n");
850: }
851: $r->print("</table>\n</table>\n");
852: return;
853: }
854:
855: sub html_preamble {
856: my $Str='';
857: $Str .= "<h2>".
858: $env{'course.'.$env{'request.course.id'}.'.description'}.
859: "</h2>\n";
860: my ($starttime,$endtime) = &Apache::lonstathelpers::get_time_limits();
861: if (defined($starttime) || defined($endtime)) {
862: # Inform the user what the time limits on the data are.
863: $Str .= '<h3>'.&mt('Statistics on submissions from [_1] to [_2]',
864: &Apache::lonlocal::locallocaltime($starttime),
865: &Apache::lonlocal::locallocaltime($endtime)
866: ).'</h3>';
867: }
868: $Str .= "<h3>".&mt('Compiled on [_1]',
869: &Apache::lonlocal::locallocaltime(time))."</h3>";
870: return $Str;
871: }
872:
873:
874: ###############################################
875: ###############################################
876: ##
877: ## Misc HTML output routines
878: ##
879: ###############################################
880: ###############################################
881: sub statistics_html_table_data {
882: my ($data,$options) = @_;
883: my $row = '';
884: foreach my $field (@Fields) {
885: next if ($options =~ /no $field->{'name'}/);
886: next if ($field->{'selected'} ne 'yes');
887: $row .= '<td bgcolor="'.$field->{'color'}.'"';
888: if (exists($field->{'align'})) {
889: $row .= ' align="'.$field->{'align'}.'"';
890: }
891: $row .= '>';
892: if (exists($field->{'special'}) && $field->{'special'} eq 'link') {
893: $row .= '<a href="'.$data->{$field->{'name'}.'.link'}.'">';
894: }
895: if (exists($field->{'format'}) && $data->{$field->{'name'}} !~ /[A-Z]/i) {
896: $row .= sprintf($field->{'format'},$data->{$field->{'name'}});
897: } else {
898: $row .= $data->{$field->{'name'}};
899: }
900: if (exists($field->{'special'}) && $field->{'special'} eq 'link') {
901: $row.= '</a>';
902: }
903: $row .= '</td>';
904: }
905: return $row;
906: }
907:
908: sub statistics_table_header {
909: my ($options) = @_;
910: my $header_row;
911: foreach my $field (@Fields) {
912: next if ($options =~ /no $field->{'name'}/);
913: next if ($field->{'selected'} ne 'yes');
914: $header_row .= '<th>';
915: if (exists($field->{'sortable'}) && $field->{'sortable'} eq 'yes') {
916: $header_row .= '<a href="javascript:'.
917: 'document.Statistics.sortby.value='."'".$field->{'name'}."'".
918: ';document.Statistics.submit();">';
919: }
920: $header_row .= &mt($field->{'title'});
921: if ($options =~ /sortable/) {
922: $header_row.= '</a>';
923: }
924: if ($options !~ /no plots/ &&
925: exists($field->{'graphable'}) &&
926: $field->{'graphable'} eq 'yes') {
927: $header_row.=' (';
928: $header_row .= '<a href="javascript:'.
929: "document.Statistics.plot.value='$field->{'name'}'".
930: ';document.Statistics.submit();">';
931: $header_row .= &mt('plot').'</a>)';
932: }
933: $header_row .= '</th>';
934: }
935: return $header_row;
936: }
937:
938: sub sequence_html_header {
939: my $Str .= '<tr>';
940: foreach my $field (@SeqFields) {
941: # next if ($field->{'selected'} ne 'yes');
942: $Str .= '<th bgcolor="'.$field->{'color'}.'"';
943: $Str .= '>'.$field->{'title'}.'</th>';
944: }
945: $Str .= '</tr>';
946: return $Str;
947: }
948:
949:
950: sub sequence_html_output {
951: my ($seq) = @_;
952: my $data = $SeqStat{$seq->symb};
953: my $row = '<tr>';
954: foreach my $field (@SeqFields) {
955: next if ($field->{'selected'} ne 'yes');
956: $row .= '<td bgcolor="'.$field->{'color'}.'"';
957: if (exists($field->{'align'})) {
958: $row .= ' align="'.$field->{'align'}.'"';
959: }
960: $row .= '>';
961: if (exists($field->{'format'})) {
962: $row .= sprintf($field->{'format'},$data->{$field->{'name'}});
963: } else {
964: $row .= $data->{$field->{'name'}};
965: }
966: $row .= '</td>';
967: }
968: $row .= '</tr>'."\n";
969: return $row;
970: }
971:
972: ####################################################
973: ####################################################
974: ##
975: ## Plotting Routines
976: ##
977: ####################################################
978: ####################################################
979: sub make_plot {
980: my ($r,$plot) = @_;
981: &compute_all_statistics($r);
982: &sort_data($env{'form.sortby'});
983: if ($plot eq 'degrees') {
984: °rees_plot($r);
985: } elsif ($plot eq 'tries statistics') {
986: &tries_data_plot($r);
987: } else {
988: &make_single_stat_plot($r,$plot);
989: }
990: return;
991: }
992:
993: sub make_single_stat_plot {
994: my ($r,$datafield) = @_;
995: #
996: my $title; my $yaxis;
997: foreach my $field (@Fields) {
998: next if ($field->{'name'} ne $datafield);
999: $title = $field->{'long_title'};
1000: $yaxis = $field->{'title'};
1001: last;
1002: }
1003: if ($title eq '' || $yaxis eq '') {
1004: # datafield is something we do not know enough about to plot
1005: $r->print('<h3>'.
1006: &mt('Unable to plot the requested statistic.').
1007: '</h3>');
1008: return;
1009: }
1010: #
1011: # Build up the data sets to plot
1012: my @Labels;
1013: my @Data;
1014: my $max = 1;
1015: foreach my $data (@StatsArray) {
1016: push(@Labels,$data->{'problem_num'});
1017: push(@Data,$data->{$datafield});
1018: if ($data->{$datafield}>$max) {
1019: $max = $data->{$datafield};
1020: }
1021: }
1022: foreach (1,2,3,4,5,10,15,20,25,40,50,75,100,150,200,250,300,500,600,750,
1023: 1000,1500,2000,2500,3000,3500,4000,5000,7500,10000,15000,20000) {
1024: if ($max <= $_) {
1025: $max = $_;
1026: last;
1027: }
1028: }
1029: if ($max > 20000) {
1030: $max = 10000*(int($max/10000)+1);
1031: }
1032: #
1033: $r->print("<p>".&Apache::loncommon::DrawBarGraph($title,
1034: 'Problem Number',
1035: $yaxis,
1036: $max,
1037: undef, # colors
1038: \@Labels,
1039: \@Data)."</p>\n");
1040: return;
1041: }
1042:
1043: sub degrees_plot {
1044: my ($r)=@_;
1045: my $count = scalar(@StatsArray);
1046: my $width = 50 + 10*$count;
1047: $width = 300 if ($width < 300);
1048: my $height = 300;
1049: my $plot = '';
1050: my $ymax = 0;
1051: my $ymin = 0;
1052: my @Disc; my @Diff; my @Labels;
1053: foreach my $data (@StatsArray) {
1054: push(@Labels,$data->{'problem_num'});
1055: my $disc = $data->{'deg_of_disc'};
1056: my $diff = $data->{'deg_of_diff'};
1057: push(@Disc,$disc);
1058: push(@Diff,$diff);
1059: #
1060: $ymin = $disc if ($ymin > $disc);
1061: $ymin = $diff if ($ymin > $diff);
1062: $ymax = $disc if ($ymax < $disc);
1063: $ymax = $diff if ($ymax < $diff);
1064: }
1065: #
1066: # Make sure we show relevant information.
1067: if ($ymin < 0) {
1068: if (abs($ymin) < 0.05) {
1069: $ymin = 0;
1070: } else {
1071: $ymin = -1;
1072: }
1073: }
1074: if ($ymax > 0) {
1075: if (abs($ymax) < 0.05) {
1076: $ymax = 0;
1077: } else {
1078: $ymax = 1;
1079: }
1080: }
1081: #
1082: my $xmax = $Labels[-1];
1083: if ($xmax > 50) {
1084: if ($xmax % 10 != 0) {
1085: $xmax = 10 * (int($xmax/10)+1);
1086: }
1087: } else {
1088: if ($xmax % 5 != 0) {
1089: $xmax = 5 * (int($xmax/5)+1);
1090: }
1091: }
1092: #
1093: my $discdata .= '<data>'.join(',',@Labels).'</data>'.$/.
1094: '<data>'.join(',',@Disc).'</data>'.$/;
1095: #
1096: my $diffdata .= '<data>'.join(',',@Labels).'</data>'.$/.
1097: '<data>'.join(',',@Diff).'</data>'.$/;
1098: #
1099: my $title = 'Degree of Discrimination\nand Degree of Difficulty';
1100: if ($xmax > 50) {
1101: $title = 'Degree of Discrimination and Degree of Difficulty';
1102: }
1103: #
1104: $plot=<<"END";
1105: <gnuplot
1106: texfont="10"
1107: fgcolor="x000000"
1108: plottype="Cartesian"
1109: font="large"
1110: grid="on"
1111: align="center"
1112: border="on"
1113: transparent="on"
1114: alttag="Degree of Discrimination and Degree of Difficulty Plot"
1115: samples="100"
1116: bgcolor="xffffff"
1117: height="$height"
1118: width="$width">
1119: <key
1120: pos="top right"
1121: title=""
1122: box="off" />
1123: <title>$title</title>
1124: <axis xmin="0" ymin="$ymin" xmax="$xmax" ymax="$ymax" color="x000000" />
1125: <xlabel>Problem Number</xlabel>
1126: <curve
1127: linestyle="linespoints"
1128: name="DoDisc"
1129: pointtype="0"
1130: color="x000000">
1131: $discdata
1132: </curve>
1133: <curve
1134: linestyle="linespoints"
1135: name="DoDiff"
1136: pointtype="0"
1137: color="xFF0000">
1138: $diffdata
1139: </curve>
1140: </gnuplot>
1141: END
1142: my $plotresult =
1143: '<p>'.&Apache::lonxml::xmlparse($r,'web',$plot).'</p>'.$/;
1144: $r->print($plotresult);
1145: return;
1146: }
1147:
1148: sub tries_data_plot {
1149: my ($r)=@_;
1150: my $count = scalar(@StatsArray);
1151: my $width = 50 + 10*$count;
1152: $width = 300 if ($width < 300);
1153: my $height = 300;
1154: my $plot = '';
1155: my @STD; my @Mean; my @Max; my @Min;
1156: my @Labels;
1157: my $ymax = 5;
1158: foreach my $data (@StatsArray) {
1159: my $max = $data->{'mean_tries'} + $data->{'std_tries'};
1160: $ymax = $max if ($ymax < $max);
1161: $ymax = $max if ($ymax < $max);
1162: push(@Labels,$data->{'problem_num'});
1163: push(@STD,$data->{'std_tries'});
1164: push(@Mean,$data->{'mean_tries'});
1165: }
1166: #
1167: # Make sure we show relevant information.
1168: my $xmax = $Labels[-1];
1169: if ($xmax > 50) {
1170: if ($xmax % 10 != 0) {
1171: $xmax = 10 * (int($xmax/10)+1);
1172: }
1173: } else {
1174: if ($xmax % 5 != 0) {
1175: $xmax = 5 * (int($xmax/5)+1);
1176: }
1177: }
1178: $ymax = int($ymax)+1+2;
1179: #
1180: my $std_data .= '<data>'.join(',',@Labels).'</data>'.$/.
1181: '<data>'.join(',',@Mean).'</data>'.$/;
1182: #
1183: my $std_error_data .= '<data>'.join(',',@Labels).'</data>'.$/.
1184: '<data>'.join(',',@Mean).'</data>'.$/.
1185: '<data>'.join(',',@STD).'</data>'.$/;
1186: #
1187: my $title = 'Mean and S.D. of Tries';
1188: if ($xmax > 25) {
1189: $title = 'Mean and Standard Deviation of Tries';
1190: }
1191: #
1192: $plot=<<"END";
1193: <gnuplot
1194: texfont="10"
1195: fgcolor="x000000"
1196: plottype="Cartesian"
1197: font="large"
1198: grid="on"
1199: align="center"
1200: border="on"
1201: transparent="on"
1202: alttag="Mean and S.D of Tries Plot"
1203: samples="100"
1204: bgcolor="xffffff"
1205: height="$height"
1206: width="$width">
1207: <title>$title</title>
1208: <axis xmin="0" ymin="0" xmax="$xmax" ymax="$ymax" color="x000000" />
1209: <xlabel>Problem Number</xlabel>
1210: <ylabel>Number of Tries</ylabel>
1211: <curve
1212: linestyle="yerrorbars"
1213: name="S.D. Tries"
1214: pointtype="1"
1215: color="x666666">
1216: $std_error_data
1217: </curve>
1218: <curve
1219: linestyle="points"
1220: name="Mean Tries"
1221: pointtype="1"
1222: color="xCC4444">
1223: $std_data
1224: </curve>
1225: </gnuplot>
1226: END
1227: my $plotresult =
1228: '<p>'.&Apache::lonxml::xmlparse($r,'web',$plot).'</p>'.$/;
1229: $r->print($plotresult);
1230: return;
1231: }
1232:
1233: sub plot_dropdown {
1234: my $current = '';
1235: #
1236: if (defined($env{'form.plot'})) {
1237: $current = $env{'form.plot'};
1238: }
1239: #
1240: my @Additional_Plots = (
1241: { graphable=>'yes',
1242: name => 'degrees',
1243: title => 'Difficulty Indexes' },
1244: { graphable=>'yes',
1245: name => 'tries statistics',
1246: title => 'Tries Statistics' });
1247: #
1248: my $Str= "\n".'<select name="plot" size="1">';
1249: $Str .= '<option name="none"></option>'."\n";
1250: $Str .= '<option name="none2">none</option>'."\n";
1251: foreach my $field (@Additional_Plots,@Fields) {
1252: if (! exists($field->{'graphable'}) ||
1253: $field->{'graphable'} ne 'yes') {
1254: next;
1255: }
1256: $Str .= '<option value="'.$field->{'name'}.'"';
1257: if ($field->{'name'} eq $current) {
1258: $Str .= ' selected ';
1259: }
1260: $Str.= '>'.&mt($field->{'title'}).'</option>'."\n";
1261: }
1262: $Str .= '</select>'."\n";
1263: return $Str;
1264: }
1265:
1266: ###############################################
1267: ###############################################
1268: ##
1269: ## Excel output routines
1270: ##
1271: ###############################################
1272: ###############################################
1273: sub Excel_output {
1274: my ($r) = @_;
1275: $r->print('<h2>'.&mt('Preparing Excel Spreadsheet').'</h2>');
1276: ##
1277: ## Compute the statistics
1278: &compute_all_statistics($r);
1279: my $c = $r->connection;
1280: return if ($c->aborted());
1281: #
1282: my ($starttime,$endtime) = &Apache::lonstathelpers::get_time_limits();
1283: ##
1284: ## Create the excel workbook
1285: my ($excel_workbook,$filename,$format) =
1286: &Apache::loncommon::create_workbook($r);
1287: return if (! defined($excel_workbook));
1288: #
1289: # Add a worksheet
1290: my $sheetname = $env{'course.'.$env{'request.course.id'}.'.description'};
1291: if (length($sheetname) > 31) {
1292: $sheetname = substr($sheetname,0,31);
1293: }
1294: my $excel_sheet = $excel_workbook->addworksheet(
1295: &Apache::loncommon::clean_excel_name($sheetname));
1296: ##
1297: ## Begin creating excel sheet
1298: ##
1299: my ($rows_output,$cols_output) = (0,0);
1300: #
1301: # Put the course description in the header
1302: $excel_sheet->write($rows_output,$cols_output++,
1303: $env{'course.'.$env{'request.course.id'}.'.description'},
1304: $format->{'h1'});
1305: $cols_output += 3;
1306: #
1307: # Put a description of the sections listed
1308: my $sectionstring = '';
1309: $excel_sheet->write($rows_output,$cols_output++,
1310: &Apache::lonstatistics::section_and_enrollment_description('plaintext'),
1311: $format->{'h3'});
1312: $cols_output += scalar(&Apache::lonstatistics::get_selected_sections());
1313: #
1314: # Time restrictions
1315: my $time_string;
1316: if (defined($starttime)) {
1317: # call localtime but not lonlocal:locallocaltime because excel probably
1318: # cannot handle localized text. Probably.
1319: $time_string .= 'Data collected from '.localtime($time_string);
1320: if (defined($endtime)) {
1321: $time_string .= ' to '.localtime($endtime);
1322: }
1323: $time_string .= '.';
1324: } elsif (defined($endtime)) {
1325: # See note above about lonlocal:locallocaltime
1326: $time_string .= 'Data collected before '.localtime($endtime).'.';
1327: }
1328: if (defined($time_string)) {
1329: $excel_sheet->write($rows_output,$cols_output++,$time_string);
1330: $cols_output+= 5;
1331: }
1332: #
1333: # Put the date in there too
1334: $excel_sheet->write($rows_output,$cols_output++,
1335: 'Compiled on '.localtime(time));
1336: #
1337: $rows_output++;
1338: $cols_output=0;
1339: ##
1340: ## Sequence Statistics
1341: ##
1342: &write_headers($excel_sheet,$format,\$rows_output,\$cols_output,
1343: \@SeqFields);
1344: foreach my $seq (@sequences) {
1345: my $data = $SeqStat{$seq->symb};
1346: $cols_output=0;
1347: foreach my $field (@SeqFields) {
1348: next if ($field->{'selected'} ne 'yes');
1349: my $fieldformat = undef;
1350: if (exists($field->{'excel_format'})) {
1351: $fieldformat = $format->{$field->{'excel_format'}};
1352: }
1353: $excel_sheet->write($rows_output,$cols_output++,
1354: $data->{$field->{'name'}},$fieldformat);
1355: }
1356: $rows_output++;
1357: $cols_output=0;
1358: }
1359: ##
1360: ## Resource Statistics
1361: ##
1362: $rows_output++;
1363: $cols_output=0;
1364: &write_headers($excel_sheet,$format,\$rows_output,\$cols_output,
1365: \@Fields);
1366: #
1367: foreach my $data (@StatsArray) {
1368: $cols_output=0;
1369: foreach my $field (@Fields) {
1370: next if ($field->{'selected'} ne 'yes');
1371: next if ($field->{'name'} eq 'problem_num');
1372: my $fieldformat = undef;
1373: if (exists($field->{'excel_format'})) {
1374: $fieldformat = $format->{$field->{'excel_format'}};
1375: }
1376: $excel_sheet->write($rows_output,$cols_output++,
1377: $data->{$field->{'name'}},$fieldformat);
1378: }
1379: $rows_output++;
1380: $cols_output=0;
1381: }
1382: #
1383: $excel_workbook->close();
1384: #
1385: # Tell the user where to get their excel file
1386: $r->print('<br />'.
1387: '<a href="'.$filename.'">'.
1388: &mt('Your Excel Spreadsheet').'</a>'."\n");
1389: $r->rflush();
1390: return;
1391: }
1392:
1393: ##
1394: ## &write_headers
1395: ##
1396: sub write_headers {
1397: my ($excel_sheet,$format,$rows_output,$cols_output,$Fields) = @_;
1398: ##
1399: ## First the long titles
1400: foreach my $field (@{$Fields}) {
1401: next if ($field->{'name'} eq 'problem_num');
1402: next if ($field->{'selected'} ne 'yes');
1403: if (exists($field->{'long_title'})) {
1404: $excel_sheet->write($$rows_output,${$cols_output},
1405: $field->{'long_title'},
1406: $format->{'bold'});
1407: } else {
1408: $excel_sheet->write($$rows_output,${$cols_output},'');
1409: }
1410: ${$cols_output}+= 1;
1411: }
1412: ${$cols_output} =0;
1413: ${$rows_output}+=1;
1414: ##
1415: ## Then the short titles
1416: foreach my $field (@{$Fields}) {
1417: next if ($field->{'selected'} ne 'yes');
1418: next if ($field->{'name'} eq 'problem_num');
1419: # Use english for excel as I am not sure how well excel handles
1420: # other character sets....
1421: $excel_sheet->write($$rows_output,$$cols_output,
1422: $field->{'title'},
1423: $format->{'bold'});
1424: $$cols_output+=1;
1425: }
1426: ${$cols_output} =0;
1427: ${$rows_output}+=1;
1428: return;
1429: }
1430:
1431: ##################################################
1432: ##################################################
1433: ##
1434: ## Statistics Gathering and Manipulation Routines
1435: ##
1436: ##################################################
1437: ##################################################
1438: sub compute_statistics_on_sequence {
1439: my ($seq) = @_;
1440: my @Data;
1441: foreach my $res (&Apache::lonstathelpers::get_resources($navmap,$seq)) {
1442: foreach my $part (@{$res->parts}) {
1443: next if ($res->is_survey($part));
1444: #
1445: # This is where all the work happens
1446: my $data = &get_statistics($seq,$res,$part,scalar(@StatsArray)+1);
1447: push (@Data,$data);
1448: push (@StatsArray,$data);
1449: }
1450: }
1451: return @Data;
1452: }
1453:
1454: sub compute_all_statistics {
1455: my ($r) = @_;
1456: if (@StatsArray > 0) {
1457: # Assume we have already computed the statistics
1458: return;
1459: }
1460: my $c = $r->connection;
1461: foreach my $seq (@sequences) {
1462: last if ($c->aborted);
1463: &compute_sequence_statistics($seq);
1464: &compute_statistics_on_sequence($seq);
1465: }
1466: }
1467:
1468: sub sort_data {
1469: my ($sortkey) = @_;
1470: return if (! @StatsArray);
1471: #
1472: # Sort the data
1473: my $sortby = undef;
1474: foreach my $field (@Fields) {
1475: if ($sortkey eq $field->{'name'}) {
1476: $sortby = $field->{'name'};
1477: }
1478: }
1479: if (! defined($sortby) || $sortby eq '' || $sortby eq 'problem_num') {
1480: $sortby = 'container';
1481: }
1482: if ($sortby ne 'container') {
1483: # $sortby is already defined, so we can charge ahead
1484: if ($sortby =~ /^(title|part)$/i) {
1485: # Alpha comparison
1486: @StatsArray = sort {
1487: lc($a->{$sortby}) cmp lc($b->{$sortby}) ||
1488: lc($a->{'title'}) cmp lc($b->{'title'}) ||
1489: lc($a->{'part'}) cmp lc($b->{'part'});
1490: } @StatsArray;
1491: } else {
1492: # Numerical comparison
1493: @StatsArray = sort {
1494: my $retvalue = 0;
1495: if ($b->{$sortby} eq 'nan') {
1496: if ($a->{$sortby} ne 'nan') {
1497: $retvalue = -1;
1498: } else {
1499: $retvalue = 0;
1500: }
1501: }
1502: if ($a->{$sortby} eq 'nan') {
1503: if ($b->{$sortby} ne 'nan') {
1504: $retvalue = 1;
1505: }
1506: }
1507: if ($retvalue eq '0') {
1508: $retvalue = $b->{$sortby} <=> $a->{$sortby} ||
1509: lc($a->{'title'}) <=> lc($b->{'title'}) ||
1510: lc($a->{'part'}) <=> lc($b->{'part'});
1511: }
1512: $retvalue;
1513: } @StatsArray;
1514: }
1515: }
1516: #
1517: # Renumber the data set
1518: my $count;
1519: foreach my $data (@StatsArray) {
1520: $data->{'problem_num'} = ++$count;
1521: }
1522: return;
1523: }
1524:
1525: ########################################################
1526: ########################################################
1527:
1528: =pod
1529:
1530: =item &get_statistics()
1531:
1532: Wrapper routine from the call to loncoursedata::get_problem_statistics.
1533: Calls lonstathelpers::get_time_limits() to limit the data set by time
1534: and &compute_discrimination_factor
1535:
1536: Inputs: $sequence, $resource, $part, $problem_num
1537:
1538: Returns: Hash reference with statistics data from
1539: loncoursedata::get_problem_statistics.
1540:
1541: =cut
1542:
1543: ########################################################
1544: ########################################################
1545: sub get_statistics {
1546: my ($sequence,$resource,$part,$problem_num) = @_;
1547: #
1548: my ($starttime,$endtime) = &Apache::lonstathelpers::get_time_limits();
1549: my $symb = $resource->symb;
1550: my $courseid = $env{'request.course.id'};
1551: #
1552: my $data = &Apache::loncoursedata::get_problem_statistics
1553: ([&Apache::lonstatistics::get_selected_sections()],
1554: $Apache::lonstatistics::enrollment_status,
1555: $symb,$part,$courseid,$starttime,$endtime);
1556: $data->{'symb'} = $symb;
1557: $data->{'part'} = $part;
1558: $data->{'problem_num'} = $problem_num;
1559: $data->{'container'} = $sequence->compTitle;
1560: $data->{'title'} = $resource->compTitle;
1561: $data->{'title.link'} = $resource->src.'?symb='.
1562: &Apache::lonnet::escape($resource->symb);
1563: #
1564: if ($SelectedFields{'deg_of_disc'}) {
1565: $data->{'deg_of_disc'} =
1566: &compute_discrimination_factor($resource,$part,$sequence);
1567: }
1568: #
1569: # Store in metadata if computations were done for all students
1570: if ($data->{'num_students'} > 1) {
1571: my @Sections = &Apache::lonstatistics::get_selected_sections();
1572: my $sections = '"'.join(' ',@Sections).'"';
1573: $sections =~ s/&+/_/g; # Ensure no special characters
1574: $data->{'sections'}=$sections;
1575: $data->{'course'} = $env{'request.course.id'};
1576: my $urlres=(&Apache::lonnet::decode_symb($resource->symb))[2];
1577: $data->{'urlres'}=$urlres;
1578: my %storestats =
1579: &LONCAPA::lonmetadata::dynamic_metadata_storage($data);
1580: my ($dom,$user) = $urlres=~/^(\w+)\/(\w+)/;
1581: &Apache::lonnet::put('nohist_resevaldata',\%storestats,$dom,$user);
1582: }
1583: #
1584: $data->{'tries_per_correct'} = $data->{'tries'} /
1585: ($data->{'num_solved'}+0.1);
1586: #
1587: # Get the due date for research purposes (commented out most of the time)
1588: # $data->{'duedate'} =
1589: # &Apache::lonnet::EXT('resource.'.$part.'.duedate',$symb);
1590: # $data->{'opendate'} =
1591: # &Apache::lonnet::EXT('resource.'.$part.'.opendate',$symb);
1592: # $data->{'maxtries'} =
1593: # &Apache::lonnet::EXT('resource.'.$part.'.maxtries',$symb);
1594: # $data->{'hinttries'} =
1595: # &Apache::lonnet::EXT('resource.'.$part.'.hinttries',$symb);
1596: $data->{'weight'} =
1597: &Apache::lonnet::EXT('resource.'.$part.'.weight',$symb);
1598: # $data->{'resptypes'} = join(',',@{$resource->{'partdata'}->{$part}->{'ResponseTypes'}});
1599: return $data;
1600: }
1601:
1602: ###############################################
1603: ###############################################
1604:
1605: =pod
1606:
1607: =item &compute_discrimination_factor()
1608:
1609: Inputs: $Resource, $Sequence
1610:
1611: Returns: integer between -1 and 1
1612:
1613: =cut
1614:
1615: ###############################################
1616: ###############################################
1617: sub compute_discrimination_factor {
1618: my ($resource,$part,$seq) = @_;
1619: my $symb = $resource->symb;
1620: my @Resources;
1621: foreach my $res (&Apache::lonstathelpers::get_resources($navmap,$seq)){
1622: next if ($res->symb eq $symb);
1623: push (@Resources,$res->symb);
1624: }
1625: #
1626: # rank
1627: my ($starttime,$endtime) = &Apache::lonstathelpers::get_time_limits();
1628: my $ranking =
1629: &Apache::loncoursedata::rank_students_by_scores_on_resources
1630: (\@Resources,
1631: [&Apache::lonstatistics::get_selected_sections()],
1632: $Apache::lonstatistics::enrollment_status,undef,
1633: $starttime,$endtime);
1634: #
1635: # compute their percent scores on the problems in the sequence,
1636: my $number_to_grab = int(scalar(@{$ranking})/4);
1637: my $num_students = scalar(@{$ranking});
1638: my @BottomSet = map { $_->[&Apache::loncoursedata::RNK_student()];
1639: } @{$ranking}[0..$number_to_grab];
1640: my @TopSet =
1641: map {
1642: $_->[&Apache::loncoursedata::RNK_student()];
1643: } @{$ranking}[($num_students-$number_to_grab)..($num_students-1)];
1644: if (! @BottomSet || (@BottomSet == 1 && $BottomSet[0] eq '') ||
1645: ! @TopSet || (@TopSet == 1 && $TopSet[0] eq '')) {
1646: return 'nan';
1647: }
1648: my ($bottom_sum,$bottom_max) =
1649: &Apache::loncoursedata::get_sum_of_scores($symb,$part,\@BottomSet,
1650: undef,$starttime,$endtime);
1651: my ($top_sum,$top_max) =
1652: &Apache::loncoursedata::get_sum_of_scores($symb,$part,\@TopSet,
1653: undef,$starttime,$endtime);
1654: my $deg_of_disc;
1655: if ($top_max == 0 || $bottom_max==0) {
1656: $deg_of_disc = 'nan';
1657: } else {
1658: $deg_of_disc = ($top_sum/$top_max) - ($bottom_sum/$bottom_max);
1659: }
1660: #&Apache::lonnet::logthis(' '.$top_sum.'/'.$top_max.
1661: # ' - '.$bottom_sum.'/'.$bottom_max);
1662: return $deg_of_disc;
1663: }
1664:
1665: ###############################################
1666: ###############################################
1667: ##
1668: ## Compute KR-21
1669: ##
1670: ## To compute KR-21, you need the following information:
1671: ##
1672: ## K=the number of items in your test
1673: ## M=the mean score on the test
1674: ## s=the standard deviation of the scores on your test
1675: ##
1676: ## then:
1677: ##
1678: ## KR-21 rk= [K/(K-1)] * [1- (M*(K-M))/(K*s^2))]
1679: ##
1680: ###############################################
1681: ###############################################
1682: sub compute_sequence_statistics {
1683: my ($seq) = @_;
1684: my $symb = $seq->symb;
1685: my @Resources;
1686: my $part_count;
1687: foreach my $res (&Apache::lonstathelpers::get_resources($navmap,$seq)) {
1688: push (@Resources,$res->symb);
1689: $part_count += scalar(@{$res->parts});
1690: }
1691: my ($starttime,$endtime) = &Apache::lonstathelpers::get_time_limits();
1692: #
1693: # First compute statistics based on student scores
1694: my ($smin,$smax,$sMean,$sSTD,$scount,$sMAX) =
1695: &Apache::loncoursedata::score_stats
1696: ([&Apache::lonstatistics::get_selected_sections()],
1697: $Apache::lonstatistics::enrollment_status,
1698: \@Resources,$starttime,$endtime,undef);
1699: $SeqStat{$symb}->{'title'} = $seq->compTitle;
1700: $SeqStat{$symb}->{'scoremax'} = $smax;
1701: $SeqStat{$symb}->{'scoremin'} = $smin;
1702: $SeqStat{$symb}->{'scoremean'} = $sMean;
1703: $SeqStat{$symb}->{'scorestd'} = $sSTD;
1704: $SeqStat{$symb}->{'scorecount'} = $scount;
1705: $SeqStat{$symb}->{'max_possible'} = $sMAX;
1706: #
1707: # Compute statistics based on the number of correct problems
1708: # 'correct' is taken to mean
1709: my ($cmin,$cmax,$cMean,$cSTD,$ccount)=
1710: &Apache::loncoursedata::count_stats
1711: ([&Apache::lonstatistics::get_selected_sections()],
1712: $Apache::lonstatistics::enrollment_status,
1713: \@Resources,$starttime,$endtime,undef);
1714: my $K = $part_count;
1715: my $kr_21;
1716: if ($K > 1 && $cSTD > 0) {
1717: $kr_21 = ($K/($K-1)) * (1 - $cMean*($K-$cMean)/($K*$cSTD**2));
1718: } else {
1719: $kr_21 = 'nan';
1720: }
1721: $SeqStat{$symb}->{'countmax'} = $cmax;
1722: $SeqStat{$symb}->{'countmin'} = $cmin;
1723: $SeqStat{$symb}->{'countstd'} = $cSTD;
1724: $SeqStat{$symb}->{'countmean'} = $cMean;
1725: $SeqStat{$symb}->{'count'} = $ccount;
1726: $SeqStat{$symb}->{'items'} = $K;
1727: $SeqStat{$symb}->{'KR-21'}=$kr_21;
1728: return;
1729: }
1730:
1731:
1732:
1733: =pod
1734:
1735: =item ProblemStatisticsLegend
1736:
1737: =over 4
1738:
1739: =item #Stdnts
1740: Total number of students attempted the problem.
1741:
1742: =item Tries
1743: Total number of tries for solving the problem.
1744:
1745: =item Max Tries
1746: Largest number of tries for solving the problem by a student.
1747:
1748: =item Mean
1749: Average number of tries. [ Tries / #Stdnts ]
1750:
1751: =item #YES
1752: Number of students solved the problem correctly.
1753:
1754: =item #yes
1755: Number of students solved the problem by override.
1756:
1757: =item %Wrong
1758: Percentage of students who tried to solve the problem
1759: but is still incorrect. [ 100*((#Stdnts-(#YES+#yes))/#Stdnts) ]
1760:
1761: =item DoDiff
1762: Degree of Difficulty of the problem.
1763: [ 1 - ((#YES+#yes) / Tries) ]
1764:
1765: =item S.D.
1766: Standard Deviation of the tries.
1767: [ sqrt(sum((Xi - Mean)^2)) / (#Stdnts-1)
1768: where Xi denotes every student\'s tries ]
1769:
1770: =item Skew.
1771: Skewness of the students tries.
1772: [(sqrt( sum((Xi - Mean)^3) / #Stdnts)) / (S.D.^3)]
1773:
1774: =item Dis.F.
1775: Discrimination Factor: A Standard for evaluating the
1776: problem according to a Criterion<br>
1777:
1778: =item [Criterion to group students into %27 Upper Students -
1779: and %27 Lower Students]
1780: 1st Criterion for Sorting the Students:
1781: Sum of Partial Credit Awarded / Total Number of Tries
1782: 2nd Criterion for Sorting the Students:
1783: Total number of Correct Answers / Total Number of Tries
1784:
1785: =item Disc.
1786: Number of Students had at least one discussion.
1787:
1788: =back
1789:
1790: =cut
1791:
1792: ############################################################
1793: ############################################################
1794:
1795: 1;
1796: __END__
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