File:
[LON-CAPA] /
loncom /
interface /
statistics /
lonproblemstatistics.pm
Revision
1.112:
download - view:
text,
annotated -
select for diffs
Mon Jan 14 14:32:49 2008 UTC (16 years, 5 months ago) by
raeburn
Branches:
MAIN
CVS tags:
version_2_7_0,
version_2_6_X,
version_2_6_99_1,
version_2_6_99_0,
version_2_6_3,
version_2_6_2,
version_2_6_1,
HEAD
When using calls to &Apache::lonnet::EXT(), request a scalar explicitly, to avoid similar problems to those eencountered in bug 5578, following the change in lonnet.pm rev 1.927 which enabled EXT() to return the level a parameter is set at, if an array was requested.
1: # The LearningOnline Network with CAPA
2: #
3: # $Id: lonproblemstatistics.pm,v 1.112 2008/01/14 14:32:49 raeburn 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: use LONCAPA;
64:
65:
66: my @StatsArray;
67: my %SeqStat; # keys are symbs, values are hash refs
68:
69: ##
70: ## Localization notes:
71: ##
72: ## in @Fields[0]->{'long_title'} is placed in Excel files and is used as the
73: ## header for plots created with Graph.pm, both of which more than likely do
74: ## not support localization.
75: ##
76: #
77: #
78: ##
79: ## Description of Field attributes
80: ##
81: ## Attribute Required Value Meaning or Use
82: ##
83: ## name yes any scalar Used to uniquely identify field
84: ## title yes any scalar This is what the user sees to identify
85: ## the field. Passed through &mt().
86: ## long_title yes any scalar Used as graph heading and in excel
87: ## output. NOT translated
88: ## align no (left|right|center) HTML cell contents alignment
89: ## color yes html color HTML cell background color
90: ## used to visually group statistics
91: ## special no (link) Indicates a link, target is name.link
92: ## Currently set in &get_statistics()
93: ## graphable no (yes|no) Can a bar graph of the field be
94: ## produced?
95: ## sortable no (yes|no) Should a sort link be put in the
96: ## column header?
97: ## selectable yes (yes|no) Can the column be removed from the
98: ## statistics display?
99: ## selected yes (yes|no) Is the column selected by default?
100: ##
101: ## format no sprintf format string
102: ##
103: ## excel_format no excel format type
104: ## (see &Apache::loncommon::define_excel_formats
105: my @Fields = (
106: { name => 'problem_num',
107: title => 'P#',
108: align => 'right',
109: color => '#FFFFE6',
110: selectable => 'no',
111: defaultselected => 'yes',
112: },
113: { name => 'container',
114: title => 'Sequence or Folder',
115: align => 'left',
116: color => '#FFFFE6',
117: sortable => 'yes',
118: selectable => 'no',
119: defaultselected => 'yes',
120: },
121: { name => 'title',
122: title => 'Title',
123: align => 'left',
124: color => '#FFFFE6',
125: special => 'link',
126: sortable => 'yes',
127: selectable => 'no',
128: defaultselected => 'yes',
129: },
130: { name => 'part',
131: title => 'Part',
132: align => 'left',
133: color => '#FFFFE6',
134: selectable => 'no',
135: defaultselected => 'yes',
136: },
137: { name => 'num_students',
138: title => '#Stdnts',
139: align => 'right',
140: color => '#EEFFCC',
141: format => '%d',
142: sortable => 'yes',
143: graphable => 'yes',
144: long_title => 'Number of Students Attempting Problem',
145: selectable => 'yes',
146: defaultselected => 'yes',
147: },
148: { name => 'tries',
149: title => 'Tries',
150: align => 'right',
151: color => '#EEFFCC',
152: format => '%d',
153: sortable => 'yes',
154: graphable => 'yes',
155: long_title => 'Total Number of Tries',
156: selectable => 'yes',
157: defaultselected => 'yes',
158: },
159: { name => 'max_tries',
160: title => 'Max Tries',
161: align => 'right',
162: color => '#DDFFFF',
163: format => '%d',
164: sortable => 'yes',
165: graphable => 'yes',
166: long_title => 'Maximum Number of Tries',
167: selectable => 'yes',
168: defaultselected => 'yes',
169: },
170: { name => 'min_tries',
171: title => 'Min Tries',
172: align => 'right',
173: color => '#DDFFFF',
174: format => '%d',
175: sortable => 'yes',
176: graphable => 'yes',
177: long_title => 'Minumum Number of Tries',
178: selectable => 'yes',
179: defaultselected => 'yes',
180: },
181: { name => 'mean_tries',
182: title => 'Mean Tries',
183: align => 'right',
184: color => '#DDFFFF',
185: format => '%5.2f',
186: sortable => 'yes',
187: graphable => 'yes',
188: long_title => 'Average Number of Tries',
189: selectable => 'yes',
190: defaultselected => 'yes',
191: },
192: { name => 'std_tries',
193: title => 'S.D. tries',
194: align => 'right',
195: color => '#DDFFFF',
196: format => '%5.2f',
197: sortable => 'yes',
198: graphable => 'yes',
199: long_title => 'Standard Deviation of Number of Tries',
200: selectable => 'yes',
201: defaultselected => 'yes',
202: },
203: { name => 'skew_tries',
204: title => 'Skew Tries',
205: align => 'right',
206: color => '#DDFFFF',
207: format => '%5.2f',
208: sortable => 'yes',
209: graphable => 'yes',
210: long_title => 'Skew of Number of Tries',
211: selectable => 'yes',
212: defaultselected => 'no',
213: },
214: { name => 'num_solved',
215: title => '#YES',
216: align => 'right',
217: color => '#FFDDDD',
218: format => '%4.1f',# format => '%d',
219: sortable => 'yes',
220: graphable => 'yes',
221: long_title => 'Number of Students able to Solve',
222: selectable => 'yes',
223: defaultselected => 'yes',
224: },
225: { name => 'num_override',
226: title => '#yes',
227: align => 'right',
228: color => '#FFDDDD',
229: format => '%4.1f',# format => '%d',
230: sortable => 'yes',
231: graphable => 'yes',
232: long_title => 'Number of Students given Override',
233: selectable => 'yes',
234: defaultselected => 'yes',
235: },
236: { name => 'tries_per_correct',
237: title => 'tries/correct',
238: align => 'right',
239: color => '#FFDDDD',
240: format => '%4.1f',
241: sortable => 'yes',
242: graphable => 'yes',
243: long_title => 'Tries per Correct Answer',
244: selectable => 'yes',
245: defaultselected => 'yes',
246: },
247: { name => 'num_wrong',
248: title => '#Wrng',
249: align => 'right',
250: color => '#FFDDDD',
251: format => '%4.1f',
252: sortable => 'yes',
253: graphable => 'yes',
254: long_title => 'Number of students whose final answer is wrong',
255: selectable => 'yes',
256: defaultselected => 'yes',
257: },
258: { name => 'per_wrong',
259: title => '%Wrng',
260: align => 'right',
261: color => '#FFDDDD',
262: format => '%4.1f',
263: sortable => 'yes',
264: graphable => 'yes',
265: long_title => 'Percent of students whose final answer is wrong',
266: selectable => 'yes',
267: defaultselected => 'yes',
268: },
269: { name => 'deg_of_diff',
270: title => 'DoDiff',
271: align => 'right',
272: color => '#FFFFE6',
273: format => '%5.2f',
274: sortable => 'yes',
275: graphable => 'yes',
276: long_title => 'Degree of Difficulty'.
277: '[ 1 - ((#YES+#yes) / Tries) ]',
278: selectable => 'yes',
279: defaultselected => 'yes',
280: },
281: { name => 'deg_of_disc',
282: title => 'DoDisc',
283: align => 'right',
284: color => '#FFFFE6',
285: format => '%4.2f',
286: sortable => 'yes',
287: graphable => 'yes',
288: long_title => 'Degree of Discrimination',
289: selectable => 'yes',
290: defaultselected => 'yes',
291: },
292: ## duedate included for research purposes. Commented out most of the time.
293: # { name => 'duedate',
294: # title => 'Due Date',
295: # align => 'left',
296: # color => '#FFFFFF',
297: # sortable => 'yes',
298: # graphable => 'no',
299: # long_title => 'Due date of resource for instructor',
300: # selectable => 'no',
301: # defaultselected => 'yes',
302: # },
303: ## opendate included for research purposes. Commented out most of the time.
304: # { name => 'opendate',
305: # title => 'Open Date',
306: # align => 'left',
307: # color => '#FFFFFF',
308: # sortable => 'yes',
309: # graphable => 'no',
310: # long_title => 'date resource became answerable',
311: # selectable => 'no',
312: # defaultselected => 'yes',
313: # },
314: ## symb included for research purposes. Commented out most of the time.
315: # { name => 'symb',
316: # title => 'Symb',
317: # align => 'left',
318: # color => '#FFFFFF',
319: # sortable => 'yes',
320: # graphable => 'no',
321: # long_title => 'Unique LON-CAPA identifier for problem',
322: # selectable => 'no',
323: # defaultselected => 'yes',
324: # },
325: ## resptypes included for research purposes. Commented out most of the time.
326: # { name => 'resptypes',
327: # title => 'Response Types',
328: # align => 'left',
329: # color => '#FFFFFF',
330: # sortable => 'no',
331: # graphable => 'no',
332: # long_title => 'Response Types used in this problem',
333: # selectable => 'no',
334: # defaultselected => 'yes',
335: # },
336: ## maxtries included for research purposes. Commented out most of the time.
337: # { name => 'maxtries',
338: # title => 'Maxtries',
339: # align => 'left',
340: # color => '#FFFFFF',
341: # sortable => 'no',
342: # graphable => 'no',
343: # long_title => 'Maximum number of tries',
344: # selectable => 'no',
345: # defaultselected => 'yes',
346: # },
347: ## hinttries included for research purposes. Commented out most of the time.
348: # { name => 'hinttries',
349: # title => 'hinttries',
350: # align => 'left',
351: # color => '#FFFFFF',
352: # sortable => 'no',
353: # graphable => 'no',
354: # long_title => 'Number of tries before a hint appears',
355: # selectable => 'no',
356: # defaultselected => 'yes',
357: # },
358: #
359: ## problem weight for instructor
360: { name => 'weight',
361: title => 'weight',
362: align => 'right',
363: color => '#FFFFFF',
364: sortable => 'no',
365: graphable => 'no',
366: long_title => 'Problem weight (for instructor)',
367: selectable => 'yes',
368: defaultselected => 'yes',
369: },
370: );
371:
372: my @SeqFields = (
373: { name => 'title',
374: title => 'Sequence',
375: align => 'left',
376: color => '#FFFFE6',
377: special => 'no',
378: sortable => 'no',
379: selectable => 'yes',
380: defaultselected => 'no',
381: },
382: { name => 'items',
383: title => '#Items',
384: align => 'right',
385: color => '#FFFFE6',
386: format => '%4d',
387: sortable => 'no',
388: graphable => 'no',
389: long_title => 'Number of Items in Sequence',
390: selectable => 'yes',
391: defaultselected => 'no',
392: },
393: { name => 'scoremean',
394: title => 'Score Mean',
395: align => 'right',
396: color => '#FFFFE6',
397: format => '%4.2f',
398: sortable => 'no',
399: graphable => 'no',
400: long_title => 'Mean Sequence Score',
401: selectable => 'yes',
402: defaultselected => 'no',
403: },
404: { name => 'scorestd',
405: title => 'Score STD',
406: align => 'right',
407: color => '#FFFFE6',
408: format => '%4.2f',
409: sortable => 'no',
410: graphable => 'no',
411: long_title => 'Standard Deviation of Sequence Scores',
412: selectable => 'yes',
413: defaultselected => 'no',
414: },
415: { name => 'scoremax',
416: title => 'Score Max',
417: align => 'right',
418: color => '#FFFFE6',
419: format => '%4.2f',
420: sortable => 'no',
421: graphable => 'no',
422: long_title => 'Maximum Sequence Score',
423: selectable => 'yes',
424: defaultselected => 'no',
425: },
426: { name => 'scoremin',
427: title => 'Score Min',
428: align => 'right',
429: color => '#FFFFE6',
430: format => '%4.2f',
431: sortable => 'no',
432: graphable => 'no',
433: long_title => 'Minumum Sequence Score',
434: selectable => 'yes',
435: defaultselected => 'no',
436: },
437: { name => 'scorecount',
438: title => 'Score N',
439: align => 'right',
440: color => '#FFFFE6',
441: format => '%4d',
442: sortable => 'no',
443: graphable => 'no',
444: long_title => 'Number of Students in score computations',
445: selectable => 'yes',
446: defaultselected => 'no',
447: },
448: { name => 'countmean',
449: title => 'Count Mean',
450: align => 'right',
451: color => '#FFFFFF',
452: format => '%4.2f',
453: sortable => 'no',
454: graphable => 'no',
455: long_title => 'Mean Sequence Score',
456: selectable => 'yes',
457: defaultselected => 'no',
458: },
459: { name => 'countstd',
460: title => 'Count STD',
461: align => 'right',
462: color => '#FFFFFF',
463: format => '%4.2f',
464: sortable => 'no',
465: graphable => 'no',
466: long_title => 'Standard Deviation of Sequence Scores',
467: selectable => 'yes',
468: defaultselected => 'no',
469: },
470: { name => 'countmax',
471: title => 'Count Max',
472: align => 'right',
473: color => '#FFFFFF',
474: format => '%4.2f',
475: sortable => 'no',
476: graphable => 'no',
477: long_title => 'Maximum Number of Correct Problems',
478: selectable => 'yes',
479: defaultselected => 'no',
480: },
481: { name => 'countmin',
482: title => 'Count Min',
483: align => 'right',
484: color => '#FFFFFF',
485: format => '%4.2f',
486: sortable => 'no',
487: graphable => 'no',
488: long_title => 'Minumum Number of Correct Problems',
489: selectable => 'yes',
490: defaultselected => 'no',
491: },
492: { name => 'count',
493: title => 'Count N',
494: align => 'right',
495: color => '#FFFFFF',
496: format => '%4d',
497: sortable => 'no',
498: graphable => 'no',
499: long_title => 'Number of Students in score computations',
500: selectable => 'yes',
501: defaultselected => 'no',
502: },
503: { name => 'KR-21',
504: title => 'KR-21',
505: align => 'right',
506: color => '#FFAAAA',
507: format => '%4.2f',
508: sortable => 'no',
509: graphable => 'no',
510: long_title => 'KR-21 reliability statistic',
511: selectable => 'yes',
512: defaultselected => 'no',
513: },
514: );
515:
516: my %SelectedFields;
517:
518: sub parse_field_selection {
519: #
520: # Pull out the defaults
521: if (! defined($env{'form.fieldselections'})) {
522: $env{'form.fieldselections'} = [];
523: foreach my $field (@Fields) {
524: next if ($field->{'selectable'} ne 'yes');
525: if ($field->{'defaultselected'} eq 'yes') {
526: push(@{$env{'form.fieldselections'}},$field->{'name'});
527: }
528: }
529: }
530: #
531: # Make sure the data we are plotting is there
532: my %NeededFields;
533: if (exists($env{'form.plot'}) && $env{'form.plot'} ne '' &&
534: $env{'form.plot'} ne 'none') {
535: if ($env{'form.plot'} eq 'degrees') {
536: $NeededFields{'deg_of_diff'}++;
537: $NeededFields{'deg_of_disc'}++;
538: } elsif ($env{'form.plot'} eq 'tries statistics') {
539: $NeededFields{'mean_tries'}++;
540: $NeededFields{'std_tries'}++;
541: $NeededFields{'problem_num'}++;
542: } else {
543: $NeededFields{$env{'form.plot'}}++;
544: }
545: }
546: #
547: # This should not happen, but in case it does...
548: if (ref($env{'form.fieldselections'}) ne 'ARRAY') {
549: $env{'form.fieldselections'} = [$env{'form.fieldselections'}];
550: }
551: #
552: # Set the field data and the selected fields (for easier checking)
553: undef(%SelectedFields);
554: foreach my $field (@Fields) {
555: if ($field->{'selectable'} ne 'yes') {
556: $field->{'selected'} = 'yes';
557: } else {
558: $field->{'selected'} = 'no';
559: }
560: if (exists($NeededFields{$field->{'name'}})) {
561: $field->{'selected'} = 'yes';
562: $SelectedFields{$field->{'name'}}++;
563: }
564: foreach my $selection (@{$env{'form.fieldselections'}}) {
565: if ($selection eq $field->{'name'} || $selection eq 'all') {
566: $field->{'selected'} = 'yes';
567: $SelectedFields{$field->{'name'}}++;
568: }
569: }
570: }
571: #
572: # Always show all the sequence statistics (for now)
573: foreach my $field (@SeqFields) {
574: $field->{'selected'} = 'yes';
575: }
576: return;
577: }
578:
579: sub field_selection_input {
580: my $Str = '<select name="fieldselections" multiple size="5">'."\n";
581: $Str .= '<option value="all">all</option>'."\n";
582: foreach my $field (@Fields) {
583: next if ($field->{'selectable'} ne 'yes');
584: $Str .= ' <option value="'.$field->{'name'}.'" ';
585: if ($field->{'selected'} eq 'yes') {
586: $Str .= 'selected ';
587: }
588: $Str .= '>'.$field->{'title'}.'</option>'."\n";
589: }
590: $Str .= "</select>\n";
591: }
592:
593: ###############################################
594: ###############################################
595:
596: =pod
597:
598: =item &CreateInterface()
599:
600: Create the main intereface for the statistics page. Allows the user to
601: select sections, maps, and output.
602:
603: =cut
604:
605: ###############################################
606: ###############################################
607: sub CreateInterface {
608: my ($r) = @_;
609: #
610: &parse_field_selection();
611: #
612: my $Str = '';
613: $Str .= &Apache::lonhtmlcommon::breadcrumbs('Overall Problem Statistics',
614: 'Statistics_Overall_Key');
615: $Str .= '<table cellspacing="5">'."\n";
616: $Str .= '<tr>';
617: $Str .= '<td align="center"><b>'.&mt('Sections').'</b></td>';
618: $Str .= '<td align="center"><b>'.&mt('Groups').'</b></td>';
619: $Str .= '<td align="center"><b>'.&mt('Access Status').'</b></td>';
620: $Str .= '<td align="center"><b>'.&mt('Sequences and Folders').'</b></td>';
621: $Str .= '<td align="center"><b>'.&mt('Statistics').'</b></td>';
622: $Str .= '<td rowspan="2">'.
623: &Apache::lonstathelpers::limit_by_time_form().'</td>';
624: $Str .= '</tr>'."\n";
625: #
626: $Str .= '<tr><td align="center">'."\n";
627: $Str .= &Apache::lonstatistics::SectionSelect('Section','multiple',5);
628: $Str .= '</td><td align="center">';
629: $Str .= &Apache::lonstatistics::GroupSelect('Group','multiple',5);
630: $Str .= '</td><td align="center">';
631: $Str .= &Apache::lonhtmlcommon::StatusOptions(undef,undef,5);
632: $Str .= '</td><td align="center">';
633: #
634: $Str .= &Apache::lonstatistics::map_select('Maps','multiple,all',5);
635: $Str .= '</td><td>'.&field_selection_input();
636: $Str .= '</td></tr>'."\n";
637: $Str .= '</table>'."\n";
638: #
639: $Str .= '<p>'.&mt('Status: [_1]',
640: '<input type="text" '.
641: 'name="stats_status" size="60" value="" />'
642: ).
643: '</nobr></p>';
644: #
645: $Str .= '<input type="submit" name="GenerateStatistics" value="'.
646: &mt('Generate Statistics').'" />';
647: $Str .= ' 'x5;
648: $Str .= 'Plot '.&plot_dropdown().(' 'x10);
649: #
650: return $Str;
651: }
652:
653: ###############################################
654: ###############################################
655:
656: =pod
657:
658: =item &BuildProblemStatisticsPage()
659:
660: Main interface to problem statistics.
661:
662: =cut
663:
664: ###############################################
665: ###############################################
666: my $navmap;
667: my @sequences;
668:
669: sub clean_up {
670: undef($navmap);
671: undef(@sequences);
672: }
673:
674: sub BuildProblemStatisticsPage {
675: my ($r,$c)=@_;
676: undef($navmap);
677: undef(@sequences);
678: #
679: my %Saveable_Parameters = ('Status' => 'scalar',
680: 'statsoutputmode' => 'scalar',
681: 'Section' => 'array',
682: 'Groups' => 'array',
683: 'StudentData' => 'array',
684: 'Maps' => 'array',
685: 'fieldselections'=> 'array');
686: &Apache::loncommon::store_course_settings('statistics',
687: \%Saveable_Parameters);
688: &Apache::loncommon::restore_course_settings('statistics',
689: \%Saveable_Parameters);
690: #
691: &Apache::lonstatistics::PrepareClasslist();
692: #
693: # Clear the package variables
694: undef(@StatsArray);
695: undef(%SeqStat);
696: #
697: # Finally let the user know we are here
698: my $interface = &CreateInterface($r);
699: $r->print($interface);
700: $r->print('<input type="hidden" name="sortby" value="'.$env{'form.sortby'}.
701: '" />');
702: #
703: my @CacheButtonHTML =
704: &Apache::lonstathelpers::manage_caches($r,'Statistics','stats_status');
705: my $Str;
706: foreach my $html (@CacheButtonHTML) {
707: $Str.=$html.(' 'x5);
708: }
709: #
710: $r->print($Str);
711: if (! exists($env{'form.firstrun'})) {
712: $r->print('<h3>'.
713: &mt('Press "Generate Statistics" when you are ready.').
714: '</h3><p>'.
715: &mt('It may take some time to update the student data '.
716: 'for the first analysis. Future analysis this session '.
717: ' will not have this delay.').
718: '</p>');
719: &clean_up();
720: return;
721: }
722: $r->rflush();
723: #
724: # This probably does not need to be done each time we are called, but
725: # it does not slow things down noticably.
726: &Apache::loncoursedata::populate_weight_table();
727: #
728: ($navmap,@sequences) =
729: &Apache::lonstatistics::selected_sequences_with_assessments();
730: if (! ref($navmap)) {
731: $r->print('<h1>'.&mt('A course-wide error occured.').'</h1>'.
732: '<h3>'.$navmap.'</h3>');
733: &clean_up();
734: return;
735: }
736: if (exists($env{'form.Excel'})) {
737: $r->print('<h4>'.
738: &Apache::lonstatistics::section_and_enrollment_description().
739: '</h4>');
740: &Excel_output($r);
741: } else {
742: $r->print('<input type="submit" name="Excel" value="'.
743: &mt('Produce Excel Output').'" />'.' 'x5);
744: $r->rflush();
745: $r->print('<h4>'.
746: &Apache::lonstatistics::section_and_enrollment_description().
747: '</h4>');
748: my $count = 0;
749: foreach my $seq (@sequences) {
750: my @resources =
751: &Apache::lonstathelpers::get_resources($navmap,$seq);
752: $count += scalar(@resources);
753: }
754: if ($count > 10) {
755: $r->print('<h2>'.
756: &mt('Compiling statistics for [_1] problems',$count).
757: '</h2>');
758: if ($count > 30) {
759: $r->print('<h3>'.&mt('This will take some time.').'</h3>');
760: }
761: $r->rflush();
762: }
763: #
764: my $sortby = $env{'form.sortby'};
765: $sortby = 'container' if (! defined($sortby) || $sortby =~ /^\s*$/);
766: my $plot = $env{'form.plot'};
767: if ($plot eq '' || $plot eq 'none') {
768: undef($plot);
769: }
770: if ($sortby eq 'container' && ! defined($plot)) {
771: &output_sequence_statistics($r);
772: &output_html_by_sequence($r);
773: } else {
774: if (defined($plot)) {
775: &make_plot($r,$plot);
776: }
777: &output_html_stats($r);
778: &output_sequence_statistics($r);
779: }
780: }
781: &clean_up();
782: return;
783: }
784:
785: sub output_sequence_statistics {
786: my ($r) = @_;
787: my $c=$r->connection();
788: $r->print('<h2>'.&mt('Sequence Statistics').
789: &Apache::loncommon::help_open_topic('Statistics_Sequence').
790: '</h2>');
791: $r->print('<table border="0"><tr><td bgcolor="#777777">'."\n".
792: '<table border="0" cellpadding="3">'."\n".
793: '<tr bgcolor="#FFFFE6">');
794: $r->print(&sequence_html_header());
795: foreach my $seq (@sequences) {
796: last if ($c->aborted);
797: &compute_sequence_statistics($seq);
798: $r->print(&sequence_html_output($seq));
799: }
800: $r->print('</table>');
801: $r->print('</table>');
802: $r->rflush();
803: return;
804: }
805:
806:
807: ##########################################################
808: ##########################################################
809: ##
810: ## HTML output routines
811: ##
812: ##########################################################
813: ##########################################################
814: sub output_html_by_sequence {
815: my ($r) = @_;
816: my $c = $r->connection();
817: $r->print(&html_preamble());
818: #
819: foreach my $seq (@sequences) {
820: last if ($c->aborted);
821: $r->print("<h3>".$seq->compTitle."</h3>".
822: '<table border="0"><tr><td bgcolor="#777777">'."\n".
823: '<table border="0" cellpadding="3">'."\n".
824: '<tr bgcolor="#FFFFE6">'.
825: &statistics_table_header('no container')."</tr>\n");
826: my @Data = &compute_statistics_on_sequence($seq);
827: foreach my $data (@Data) {
828: $r->print('<tr>'.&statistics_html_table_data($data,
829: 'no container').
830: "</tr>\n");
831: }
832: $r->print('</table>'."\n".'</table>'."\n");
833: $r->rflush();
834: }
835: return;
836: }
837:
838: sub output_html_stats {
839: my ($r)=@_;
840: &compute_all_statistics($r);
841: $r->print(&html_preamble());
842: &sort_data($env{'form.sortby'});
843: #
844: my $count=0;
845: foreach my $data (@StatsArray) {
846: if ($count++ % 50 == 0) {
847: $r->print("</table>\n</table>\n");
848: $r->print('<table border="0"><tr><td bgcolor="#777777">'."\n".
849: '<table border="0" cellpadding="3">'."\n".
850: '<tr bgcolor="#FFFFE6">'.
851: '<tr bgcolor="#FFFFE6">'.
852: &statistics_table_header().
853: "</tr>\n");
854: }
855: $r->print('<tr>'.&statistics_html_table_data($data)."</tr>\n");
856: }
857: $r->print("</table>\n</table>\n");
858: return;
859: }
860:
861: sub html_preamble {
862: my $Str='';
863: $Str .= "<h2>".
864: $env{'course.'.$env{'request.course.id'}.'.description'}.
865: "</h2>\n";
866: my ($starttime,$endtime) = &Apache::lonstathelpers::get_time_limits();
867: if (defined($starttime) || defined($endtime)) {
868: # Inform the user what the time limits on the data are.
869: $Str .= '<h3>'.&mt('Statistics on submissions from [_1] to [_2]',
870: &Apache::lonlocal::locallocaltime($starttime),
871: &Apache::lonlocal::locallocaltime($endtime)
872: ).'</h3>';
873: }
874: $Str .= "<h3>".&mt('Compiled on [_1]',
875: &Apache::lonlocal::locallocaltime(time))."</h3>";
876: return $Str;
877: }
878:
879:
880: ###############################################
881: ###############################################
882: ##
883: ## Misc HTML output routines
884: ##
885: ###############################################
886: ###############################################
887: sub statistics_html_table_data {
888: my ($data,$options) = @_;
889: my $row = '';
890: foreach my $field (@Fields) {
891: next if ($options =~ /no $field->{'name'}/);
892: next if ($field->{'selected'} ne 'yes');
893: $row .= '<td bgcolor="'.$field->{'color'}.'"';
894: if (exists($field->{'align'})) {
895: $row .= ' align="'.$field->{'align'}.'"';
896: }
897: $row .= '>';
898: if (exists($field->{'special'}) && $field->{'special'} eq 'link') {
899: $row .= '<a href="'.$data->{$field->{'name'}.'.link'}.'">';
900: }
901: if (exists($field->{'format'}) && $data->{$field->{'name'}} !~ /[A-Z]/i) {
902: $row .= sprintf($field->{'format'},$data->{$field->{'name'}});
903: } else {
904: $row .= $data->{$field->{'name'}};
905: }
906: if (exists($field->{'special'}) && $field->{'special'} eq 'link') {
907: $row.= '</a>';
908: }
909: $row .= '</td>';
910: }
911: return $row;
912: }
913:
914: sub statistics_table_header {
915: my ($options) = @_;
916: my $header_row;
917: foreach my $field (@Fields) {
918: next if ($options =~ /no $field->{'name'}/);
919: next if ($field->{'selected'} ne 'yes');
920: $header_row .= '<th>';
921: if (exists($field->{'sortable'}) && $field->{'sortable'} eq 'yes') {
922: $header_row .= '<a href="javascript:'.
923: 'document.Statistics.sortby.value='."'".$field->{'name'}."'".
924: ';document.Statistics.submit();">';
925: }
926: $header_row .= &mt($field->{'title'});
927: if ($options =~ /sortable/) {
928: $header_row.= '</a>';
929: }
930: if ($options !~ /no plots/ &&
931: exists($field->{'graphable'}) &&
932: $field->{'graphable'} eq 'yes') {
933: $header_row.=' (';
934: $header_row .= '<a href="javascript:'.
935: "document.Statistics.plot.value='$field->{'name'}'".
936: ';document.Statistics.submit();">';
937: $header_row .= &mt('plot').'</a>)';
938: }
939: $header_row .= '</th>';
940: }
941: return $header_row;
942: }
943:
944: sub sequence_html_header {
945: my $Str .= '<tr>';
946: foreach my $field (@SeqFields) {
947: # next if ($field->{'selected'} ne 'yes');
948: $Str .= '<th bgcolor="'.$field->{'color'}.'"';
949: $Str .= '>'.$field->{'title'}.'</th>';
950: }
951: $Str .= '</tr>';
952: return $Str;
953: }
954:
955:
956: sub sequence_html_output {
957: my ($seq) = @_;
958: my $data = $SeqStat{$seq->symb};
959: my $row = '<tr>';
960: foreach my $field (@SeqFields) {
961: next if ($field->{'selected'} ne 'yes');
962: $row .= '<td bgcolor="'.$field->{'color'}.'"';
963: if (exists($field->{'align'})) {
964: $row .= ' align="'.$field->{'align'}.'"';
965: }
966: $row .= '>';
967: if (exists($field->{'format'})) {
968: $row .= sprintf($field->{'format'},$data->{$field->{'name'}});
969: } else {
970: $row .= $data->{$field->{'name'}};
971: }
972: $row .= '</td>';
973: }
974: $row .= '</tr>'."\n";
975: return $row;
976: }
977:
978: ####################################################
979: ####################################################
980: ##
981: ## Plotting Routines
982: ##
983: ####################################################
984: ####################################################
985: sub make_plot {
986: my ($r,$plot) = @_;
987: &compute_all_statistics($r);
988: &sort_data($env{'form.sortby'});
989: if ($plot eq 'degrees') {
990: °rees_plot($r);
991: } elsif ($plot eq 'tries statistics') {
992: &tries_data_plot($r);
993: } else {
994: &make_single_stat_plot($r,$plot);
995: }
996: return;
997: }
998:
999: sub make_single_stat_plot {
1000: my ($r,$datafield) = @_;
1001: #
1002: my $title; my $yaxis;
1003: foreach my $field (@Fields) {
1004: next if ($field->{'name'} ne $datafield);
1005: $title = $field->{'long_title'};
1006: $yaxis = $field->{'title'};
1007: last;
1008: }
1009: if ($title eq '' || $yaxis eq '') {
1010: # datafield is something we do not know enough about to plot
1011: $r->print('<h3>'.
1012: &mt('Unable to plot the requested statistic.').
1013: '</h3>');
1014: return;
1015: }
1016: #
1017: # Build up the data sets to plot
1018: my @Labels;
1019: my @Data;
1020: my $max = 1;
1021: foreach my $data (@StatsArray) {
1022: push(@Labels,$data->{'problem_num'});
1023: push(@Data,$data->{$datafield});
1024: if ($data->{$datafield}>$max) {
1025: $max = $data->{$datafield};
1026: }
1027: }
1028: foreach (1,2,3,4,5,10,15,20,25,40,50,75,100,150,200,250,300,500,600,750,
1029: 1000,1500,2000,2500,3000,3500,4000,5000,7500,10000,15000,20000) {
1030: if ($max <= $_) {
1031: $max = $_;
1032: last;
1033: }
1034: }
1035: if ($max > 20000) {
1036: $max = 10000*(int($max/10000)+1);
1037: }
1038: #
1039: $r->print("<p>".&Apache::loncommon::DrawBarGraph($title,
1040: 'Problem Number',
1041: $yaxis,
1042: $max,
1043: undef, # colors
1044: \@Labels,
1045: \@Data)."</p>\n");
1046: return;
1047: }
1048:
1049: sub degrees_plot {
1050: my ($r)=@_;
1051: my $count = scalar(@StatsArray);
1052: my $width = 50 + 10*$count;
1053: $width = 300 if ($width < 300);
1054: my $height = 300;
1055: my $plot = '';
1056: my $ymax = 0;
1057: my $ymin = 0;
1058: my @Disc; my @Diff; my @Labels;
1059: foreach my $data (@StatsArray) {
1060: push(@Labels,$data->{'problem_num'});
1061: my $disc = $data->{'deg_of_disc'};
1062: my $diff = $data->{'deg_of_diff'};
1063: push(@Disc,$disc);
1064: push(@Diff,$diff);
1065: #
1066: $ymin = $disc if ($ymin > $disc);
1067: $ymin = $diff if ($ymin > $diff);
1068: $ymax = $disc if ($ymax < $disc);
1069: $ymax = $diff if ($ymax < $diff);
1070: }
1071: #
1072: # Make sure we show relevant information.
1073: if ($ymin < 0) {
1074: if (abs($ymin) < 0.05) {
1075: $ymin = 0;
1076: } else {
1077: $ymin = -1;
1078: }
1079: }
1080: if ($ymax > 0) {
1081: if (abs($ymax) < 0.05) {
1082: $ymax = 0;
1083: } else {
1084: $ymax = 1;
1085: }
1086: }
1087: #
1088: my $xmax = $Labels[-1];
1089: if ($xmax > 50) {
1090: if ($xmax % 10 != 0) {
1091: $xmax = 10 * (int($xmax/10)+1);
1092: }
1093: } else {
1094: if ($xmax % 5 != 0) {
1095: $xmax = 5 * (int($xmax/5)+1);
1096: }
1097: }
1098: #
1099: my $discdata .= '<data>'.join(',',@Labels).'</data>'.$/.
1100: '<data>'.join(',',@Disc).'</data>'.$/;
1101: #
1102: my $diffdata .= '<data>'.join(',',@Labels).'</data>'.$/.
1103: '<data>'.join(',',@Diff).'</data>'.$/;
1104: #
1105: my $title = 'Degree of Discrimination\nand Degree of Difficulty';
1106: if ($xmax > 50) {
1107: $title = 'Degree of Discrimination and Degree of Difficulty';
1108: }
1109: #
1110: $plot=<<"END";
1111: <gnuplot
1112: texfont="10"
1113: fgcolor="x000000"
1114: plottype="Cartesian"
1115: font="large"
1116: grid="on"
1117: align="center"
1118: border="on"
1119: transparent="on"
1120: alttag="Degree of Discrimination and Degree of Difficulty Plot"
1121: samples="100"
1122: bgcolor="xffffff"
1123: height="$height"
1124: width="$width">
1125: <key
1126: pos="top right"
1127: title=""
1128: box="off" />
1129: <title>$title</title>
1130: <axis xmin="0" ymin="$ymin" xmax="$xmax" ymax="$ymax" color="x000000" />
1131: <xlabel>Problem Number</xlabel>
1132: <curve
1133: linestyle="linespoints"
1134: name="DoDisc"
1135: pointtype="0"
1136: color="x000000">
1137: $discdata
1138: </curve>
1139: <curve
1140: linestyle="linespoints"
1141: name="DoDiff"
1142: pointtype="0"
1143: color="xFF0000">
1144: $diffdata
1145: </curve>
1146: </gnuplot>
1147: END
1148: my $plotresult =
1149: '<p>'.&Apache::lonxml::xmlparse($r,'web',$plot).'</p>'.$/;
1150: $r->print($plotresult);
1151: return;
1152: }
1153:
1154: sub tries_data_plot {
1155: my ($r)=@_;
1156: my $count = scalar(@StatsArray);
1157: my $width = 50 + 10*$count;
1158: $width = 300 if ($width < 300);
1159: my $height = 300;
1160: my $plot = '';
1161: my @STD; my @Mean; my @Max; my @Min;
1162: my @Labels;
1163: my $ymax = 5;
1164: foreach my $data (@StatsArray) {
1165: my $max = $data->{'mean_tries'} + $data->{'std_tries'};
1166: $ymax = $max if ($ymax < $max);
1167: $ymax = $max if ($ymax < $max);
1168: push(@Labels,$data->{'problem_num'});
1169: push(@STD,$data->{'std_tries'});
1170: push(@Mean,$data->{'mean_tries'});
1171: }
1172: #
1173: # Make sure we show relevant information.
1174: my $xmax = $Labels[-1];
1175: if ($xmax > 50) {
1176: if ($xmax % 10 != 0) {
1177: $xmax = 10 * (int($xmax/10)+1);
1178: }
1179: } else {
1180: if ($xmax % 5 != 0) {
1181: $xmax = 5 * (int($xmax/5)+1);
1182: }
1183: }
1184: $ymax = int($ymax)+1+2;
1185: #
1186: my $std_data .= '<data>'.join(',',@Labels).'</data>'.$/.
1187: '<data>'.join(',',@Mean).'</data>'.$/;
1188: #
1189: my $std_error_data .= '<data>'.join(',',@Labels).'</data>'.$/.
1190: '<data>'.join(',',@Mean).'</data>'.$/.
1191: '<data>'.join(',',@STD).'</data>'.$/;
1192: #
1193: my $title = 'Mean and S.D. of Tries';
1194: if ($xmax > 25) {
1195: $title = 'Mean and Standard Deviation of Tries';
1196: }
1197: #
1198: $plot=<<"END";
1199: <gnuplot
1200: texfont="10"
1201: fgcolor="x000000"
1202: plottype="Cartesian"
1203: font="large"
1204: grid="on"
1205: align="center"
1206: border="on"
1207: transparent="on"
1208: alttag="Mean and S.D of Tries Plot"
1209: samples="100"
1210: bgcolor="xffffff"
1211: height="$height"
1212: width="$width">
1213: <title>$title</title>
1214: <axis xmin="0" ymin="0" xmax="$xmax" ymax="$ymax" color="x000000" />
1215: <xlabel>Problem Number</xlabel>
1216: <ylabel>Number of Tries</ylabel>
1217: <curve
1218: linestyle="yerrorbars"
1219: name="S.D. Tries"
1220: pointtype="1"
1221: color="x666666">
1222: $std_error_data
1223: </curve>
1224: <curve
1225: linestyle="points"
1226: name="Mean Tries"
1227: pointtype="1"
1228: color="xCC4444">
1229: $std_data
1230: </curve>
1231: </gnuplot>
1232: END
1233: my $plotresult =
1234: '<p>'.&Apache::lonxml::xmlparse($r,'web',$plot).'</p>'.$/;
1235: $r->print($plotresult);
1236: return;
1237: }
1238:
1239: sub plot_dropdown {
1240: my $current = '';
1241: #
1242: if (defined($env{'form.plot'})) {
1243: $current = $env{'form.plot'};
1244: }
1245: #
1246: my @Additional_Plots = (
1247: { graphable=>'yes',
1248: name => 'degrees',
1249: title => 'Difficulty Indexes' },
1250: { graphable=>'yes',
1251: name => 'tries statistics',
1252: title => 'Tries Statistics' });
1253: #
1254: my $Str= "\n".'<select name="plot" size="1">';
1255: $Str .= '<option name="none"></option>'."\n";
1256: $Str .= '<option name="none2">none</option>'."\n";
1257: foreach my $field (@Additional_Plots,@Fields) {
1258: if (! exists($field->{'graphable'}) ||
1259: $field->{'graphable'} ne 'yes') {
1260: next;
1261: }
1262: $Str .= '<option value="'.$field->{'name'}.'"';
1263: if ($field->{'name'} eq $current) {
1264: $Str .= ' selected ';
1265: }
1266: $Str.= '>'.&mt($field->{'title'}).'</option>'."\n";
1267: }
1268: $Str .= '</select>'."\n";
1269: return $Str;
1270: }
1271:
1272: ###############################################
1273: ###############################################
1274: ##
1275: ## Excel output routines
1276: ##
1277: ###############################################
1278: ###############################################
1279: sub Excel_output {
1280: my ($r) = @_;
1281: $r->print('<h2>'.&mt('Preparing Excel Spreadsheet').'</h2>');
1282: ##
1283: ## Compute the statistics
1284: &compute_all_statistics($r);
1285: my $c = $r->connection;
1286: return if ($c->aborted());
1287: #
1288: my ($starttime,$endtime) = &Apache::lonstathelpers::get_time_limits();
1289: ##
1290: ## Create the excel workbook
1291: my ($excel_workbook,$filename,$format) =
1292: &Apache::loncommon::create_workbook($r);
1293: return if (! defined($excel_workbook));
1294: #
1295: # Add a worksheet
1296: my $sheetname = $env{'course.'.$env{'request.course.id'}.'.description'};
1297: if (length($sheetname) > 31) {
1298: $sheetname = substr($sheetname,0,31);
1299: }
1300: my $excel_sheet = $excel_workbook->addworksheet(
1301: &Apache::loncommon::clean_excel_name($sheetname));
1302: ##
1303: ## Begin creating excel sheet
1304: ##
1305: my ($rows_output,$cols_output) = (0,0);
1306: #
1307: # Put the course description in the header
1308: $excel_sheet->write($rows_output,$cols_output++,
1309: $env{'course.'.$env{'request.course.id'}.'.description'},
1310: $format->{'h1'});
1311: $cols_output += 3;
1312: #
1313: # Put a description of the sections listed
1314: my $sectionstring = '';
1315: $excel_sheet->write($rows_output,$cols_output++,
1316: &Apache::lonstatistics::section_and_enrollment_description('plaintext'),
1317: $format->{'h3'});
1318: $cols_output += scalar(&Apache::lonstatistics::get_selected_sections());
1319: $cols_output += scalar(&Apache::lonstatistics::get_selected_groups());
1320: #
1321: # Time restrictions
1322: my $time_string;
1323: if (defined($starttime)) {
1324: # call localtime but not lonlocal:locallocaltime because excel probably
1325: # cannot handle localized text. Probably.
1326: $time_string .= 'Data collected from '.localtime($time_string);
1327: if (defined($endtime)) {
1328: $time_string .= ' to '.localtime($endtime);
1329: }
1330: $time_string .= '.';
1331: } elsif (defined($endtime)) {
1332: # See note above about lonlocal:locallocaltime
1333: $time_string .= 'Data collected before '.localtime($endtime).'.';
1334: }
1335: if (defined($time_string)) {
1336: $excel_sheet->write($rows_output,$cols_output++,$time_string);
1337: $cols_output+= 5;
1338: }
1339: #
1340: # Put the date in there too
1341: $excel_sheet->write($rows_output,$cols_output++,
1342: 'Compiled on '.localtime(time));
1343: #
1344: $rows_output++;
1345: $cols_output=0;
1346: ##
1347: ## Sequence Statistics
1348: ##
1349: &write_headers($excel_sheet,$format,\$rows_output,\$cols_output,
1350: \@SeqFields);
1351: foreach my $seq (@sequences) {
1352: my $data = $SeqStat{$seq->symb};
1353: $cols_output=0;
1354: foreach my $field (@SeqFields) {
1355: next if ($field->{'selected'} ne 'yes');
1356: my $fieldformat = undef;
1357: if (exists($field->{'excel_format'})) {
1358: $fieldformat = $format->{$field->{'excel_format'}};
1359: }
1360: $excel_sheet->write($rows_output,$cols_output++,
1361: $data->{$field->{'name'}},$fieldformat);
1362: }
1363: $rows_output++;
1364: $cols_output=0;
1365: }
1366: ##
1367: ## Resource Statistics
1368: ##
1369: $rows_output++;
1370: $cols_output=0;
1371: &write_headers($excel_sheet,$format,\$rows_output,\$cols_output,
1372: \@Fields);
1373: #
1374: foreach my $data (@StatsArray) {
1375: $cols_output=0;
1376: foreach my $field (@Fields) {
1377: next if ($field->{'selected'} ne 'yes');
1378: next if ($field->{'name'} eq 'problem_num');
1379: my $fieldformat = undef;
1380: if (exists($field->{'excel_format'})) {
1381: $fieldformat = $format->{$field->{'excel_format'}};
1382: }
1383: $excel_sheet->write($rows_output,$cols_output++,
1384: $data->{$field->{'name'}},$fieldformat);
1385: }
1386: $rows_output++;
1387: $cols_output=0;
1388: }
1389: #
1390: $excel_workbook->close();
1391: #
1392: # Tell the user where to get their excel file
1393: $r->print('<br />'.
1394: '<a href="'.$filename.'">'.
1395: &mt('Your Excel Spreadsheet').'</a>'."\n");
1396: $r->rflush();
1397: return;
1398: }
1399:
1400: ##
1401: ## &write_headers
1402: ##
1403: sub write_headers {
1404: my ($excel_sheet,$format,$rows_output,$cols_output,$Fields) = @_;
1405: ##
1406: ## First the long titles
1407: foreach my $field (@{$Fields}) {
1408: next if ($field->{'name'} eq 'problem_num');
1409: next if ($field->{'selected'} ne 'yes');
1410: if (exists($field->{'long_title'})) {
1411: $excel_sheet->write($$rows_output,${$cols_output},
1412: $field->{'long_title'},
1413: $format->{'bold'});
1414: } else {
1415: $excel_sheet->write($$rows_output,${$cols_output},'');
1416: }
1417: ${$cols_output}+= 1;
1418: }
1419: ${$cols_output} =0;
1420: ${$rows_output}+=1;
1421: ##
1422: ## Then the short titles
1423: foreach my $field (@{$Fields}) {
1424: next if ($field->{'selected'} ne 'yes');
1425: next if ($field->{'name'} eq 'problem_num');
1426: # Use english for excel as I am not sure how well excel handles
1427: # other character sets....
1428: $excel_sheet->write($$rows_output,$$cols_output,
1429: $field->{'title'},
1430: $format->{'bold'});
1431: $$cols_output+=1;
1432: }
1433: ${$cols_output} =0;
1434: ${$rows_output}+=1;
1435: return;
1436: }
1437:
1438: ##################################################
1439: ##################################################
1440: ##
1441: ## Statistics Gathering and Manipulation Routines
1442: ##
1443: ##################################################
1444: ##################################################
1445: sub compute_statistics_on_sequence {
1446: my ($seq) = @_;
1447: my @Data;
1448: foreach my $res (&Apache::lonstathelpers::get_resources($navmap,$seq)) {
1449: foreach my $part (@{$res->parts}) {
1450: next if ($res->is_survey($part));
1451: #
1452: # This is where all the work happens
1453: my $data = &get_statistics($seq,$res,$part,scalar(@StatsArray)+1);
1454: push (@Data,$data);
1455: push (@StatsArray,$data);
1456: }
1457: }
1458: return @Data;
1459: }
1460:
1461: sub compute_all_statistics {
1462: my ($r) = @_;
1463: if (@StatsArray > 0) {
1464: # Assume we have already computed the statistics
1465: return;
1466: }
1467: my $c = $r->connection;
1468: foreach my $seq (@sequences) {
1469: last if ($c->aborted);
1470: &compute_sequence_statistics($seq);
1471: &compute_statistics_on_sequence($seq);
1472: }
1473: }
1474:
1475: sub sort_data {
1476: my ($sortkey) = @_;
1477: return if (! @StatsArray);
1478: #
1479: # Sort the data
1480: my $sortby = undef;
1481: foreach my $field (@Fields) {
1482: if ($sortkey eq $field->{'name'}) {
1483: $sortby = $field->{'name'};
1484: }
1485: }
1486: if (! defined($sortby) || $sortby eq '' || $sortby eq 'problem_num') {
1487: $sortby = 'container';
1488: }
1489: if ($sortby ne 'container') {
1490: # $sortby is already defined, so we can charge ahead
1491: if ($sortby =~ /^(title|part)$/i) {
1492: # Alpha comparison
1493: @StatsArray = sort {
1494: lc($a->{$sortby}) cmp lc($b->{$sortby}) ||
1495: lc($a->{'title'}) cmp lc($b->{'title'}) ||
1496: lc($a->{'part'}) cmp lc($b->{'part'});
1497: } @StatsArray;
1498: } else {
1499: # Numerical comparison
1500: @StatsArray = sort {
1501: my $retvalue = 0;
1502: if ($b->{$sortby} eq 'nan') {
1503: if ($a->{$sortby} ne 'nan') {
1504: $retvalue = -1;
1505: } else {
1506: $retvalue = 0;
1507: }
1508: }
1509: if ($a->{$sortby} eq 'nan') {
1510: if ($b->{$sortby} ne 'nan') {
1511: $retvalue = 1;
1512: }
1513: }
1514: if ($retvalue eq '0') {
1515: $retvalue = $b->{$sortby} <=> $a->{$sortby} ||
1516: lc($a->{'title'}) <=> lc($b->{'title'}) ||
1517: lc($a->{'part'}) <=> lc($b->{'part'});
1518: }
1519: $retvalue;
1520: } @StatsArray;
1521: }
1522: }
1523: #
1524: # Renumber the data set
1525: my $count;
1526: foreach my $data (@StatsArray) {
1527: $data->{'problem_num'} = ++$count;
1528: }
1529: return;
1530: }
1531:
1532: ########################################################
1533: ########################################################
1534:
1535: =pod
1536:
1537: =item &get_statistics()
1538:
1539: Wrapper routine from the call to loncoursedata::get_problem_statistics.
1540: Calls lonstathelpers::get_time_limits() to limit the data set by time
1541: and &compute_discrimination_factor
1542:
1543: Inputs: $sequence, $resource, $part, $problem_num
1544:
1545: Returns: Hash reference with statistics data from
1546: loncoursedata::get_problem_statistics.
1547:
1548: =cut
1549:
1550: ########################################################
1551: ########################################################
1552: sub get_statistics {
1553: my ($sequence,$resource,$part,$problem_num) = @_;
1554: #
1555: my ($starttime,$endtime) = &Apache::lonstathelpers::get_time_limits();
1556: my $symb = $resource->symb;
1557: my $courseid = $env{'request.course.id'};
1558: #
1559: my $data = &Apache::loncoursedata::get_problem_statistics
1560: ([&Apache::lonstatistics::get_selected_sections()],
1561: [&Apache::lonstatistics::get_selected_groups()],
1562: $Apache::lonstatistics::enrollment_status,
1563: $symb,$part,$courseid,$starttime,$endtime);
1564: $data->{'symb'} = $symb;
1565: $data->{'part'} = $part;
1566: $data->{'problem_num'} = $problem_num;
1567: $data->{'container'} = $sequence->compTitle;
1568: $data->{'title'} = $resource->compTitle;
1569: $data->{'title.link'} = $resource->src.'?symb='.
1570: &escape($resource->symb);
1571: #
1572: if ($SelectedFields{'deg_of_disc'}) {
1573: $data->{'deg_of_disc'} =
1574: &compute_discrimination_factor($resource,$part,$sequence);
1575: }
1576: #
1577: # Store in metadata if computations were done for all students
1578: if ($data->{'num_students'} > 1) {
1579: my @Sections = &Apache::lonstatistics::get_selected_sections();
1580: my $sections = '"'.join(' ',@Sections).'"';
1581: $sections =~ s/&+/_/g; # Ensure no special characters
1582: $data->{'sections'}=$sections;
1583: $data->{'course'} = $env{'request.course.id'};
1584: my $urlres=(&Apache::lonnet::decode_symb($resource->symb))[2];
1585: $data->{'urlres'}=$urlres;
1586: my %storestats =
1587: &LONCAPA::lonmetadata::dynamic_metadata_storage($data);
1588: my ($dom,$user) = ($urlres=~m{^($LONCAPA::domain_re)/($LONCAPA::username_re)});
1589: &Apache::lonnet::put('nohist_resevaldata',\%storestats,$dom,$user);
1590: }
1591: #
1592: $data->{'tries_per_correct'} = $data->{'tries'} /
1593: ($data->{'num_solved'}+0.1);
1594: #
1595: # Get the due date for research purposes (commented out most of the time)
1596: # my $duedate = &Apache::lonnet::EXT('resource.'.$part.'.duedate',$symb);;
1597: # my $opendate = &Apache::lonnet::EXT('resource.'.$part.'.opendate',$symb);
1598: # my $maxtries = &Apache::lonnet::EXT('resource.'.$part.'.maxtries',$symb);
1599: # my $hinttries = &Apache::lonnet::EXT('resource.'.$part.'.hinttries',$symb);
1600: my $weight = &Apache::lonnet::EXT('resource.'.$part.'.weight',$symb);
1601: $data->{'weight'} = $weight;
1602: # $data->{'duedate'} = $duedate;
1603: # $data->{'opendate'} = $opendate;
1604: # $data->{'maxtries'} = $maxtries;
1605: # $data->{'hinttries'} = $hinttries;
1606: # $data->{'resptypes'} = join(',',@{$resource->{'partdata'}->{$part}->{'ResponseTypes'}});
1607: return $data;
1608: }
1609:
1610: ###############################################
1611: ###############################################
1612:
1613: =pod
1614:
1615: =item &compute_discrimination_factor()
1616:
1617: Inputs: $Resource, $Sequence
1618:
1619: Returns: integer between -1 and 1
1620:
1621: =cut
1622:
1623: ###############################################
1624: ###############################################
1625: sub compute_discrimination_factor {
1626: my ($resource,$part,$seq) = @_;
1627: my $symb = $resource->symb;
1628: my @Resources;
1629: foreach my $res (&Apache::lonstathelpers::get_resources($navmap,$seq)){
1630: next if ($res->symb eq $symb);
1631: push (@Resources,$res->symb);
1632: }
1633: #
1634: # rank
1635: my ($starttime,$endtime) = &Apache::lonstathelpers::get_time_limits();
1636: my $ranking =
1637: &Apache::loncoursedata::rank_students_by_scores_on_resources
1638: (\@Resources,
1639: [&Apache::lonstatistics::get_selected_sections()],
1640: [&Apache::lonstatistics::get_selected_groups()],
1641: $Apache::lonstatistics::enrollment_status,undef,
1642: $starttime,$endtime, $symb);
1643: #
1644: # compute their percent scores on the problems in the sequence,
1645: my $number_to_grab = int(scalar(@{$ranking})/4);
1646: my $num_students = scalar(@{$ranking});
1647: my @BottomSet = map { $_->[&Apache::loncoursedata::RNK_student()];
1648: } @{$ranking}[0..$number_to_grab];
1649: my @TopSet =
1650: map {
1651: $_->[&Apache::loncoursedata::RNK_student()];
1652: } @{$ranking}[-$number_to_grab..0];
1653: if (! @BottomSet || (@BottomSet == 1 && $BottomSet[0] eq '') ||
1654: ! @TopSet || (@TopSet == 1 && $TopSet[0] eq '')) {
1655: return 'nan';
1656: }
1657: my ($bottom_sum,$bottom_max) =
1658: &Apache::loncoursedata::get_sum_of_scores($symb,$part,\@BottomSet,
1659: undef,$starttime,$endtime);
1660: my ($top_sum,$top_max) =
1661: &Apache::loncoursedata::get_sum_of_scores($symb,$part,\@TopSet,
1662: undef,$starttime,$endtime);
1663: my $deg_of_disc;
1664: if ($top_max == 0 || $bottom_max==0) {
1665: $deg_of_disc = 'nan';
1666: } else {
1667: $deg_of_disc = ($top_sum/$top_max) - ($bottom_sum/$bottom_max);
1668: }
1669: #&Apache::lonnet::logthis(' '.$top_sum.'/'.$top_max.
1670: # ' - '.$bottom_sum.'/'.$bottom_max);
1671: return $deg_of_disc;
1672: }
1673:
1674: ###############################################
1675: ###############################################
1676: ##
1677: ## Compute KR-21
1678: ##
1679: ## To compute KR-21, you need the following information:
1680: ##
1681: ## K=the number of items in your test
1682: ## M=the mean score on the test
1683: ## s=the standard deviation of the scores on your test
1684: ##
1685: ## then:
1686: ##
1687: ## KR-21 rk= [K/(K-1)] * [1- (M*(K-M))/(K*s^2))]
1688: ##
1689: ###############################################
1690: ###############################################
1691: sub compute_sequence_statistics {
1692: my ($seq) = @_;
1693: my $symb = $seq->symb;
1694: my @Resources;
1695: my $part_count;
1696: foreach my $res (&Apache::lonstathelpers::get_resources($navmap,$seq)) {
1697: push (@Resources,$res->symb);
1698: $part_count += scalar(@{$res->parts});
1699: }
1700: my ($starttime,$endtime) = &Apache::lonstathelpers::get_time_limits();
1701: #
1702: # First compute statistics based on student scores
1703: my ($smin,$smax,$sMean,$sSTD,$scount,$sMAX) =
1704: &Apache::loncoursedata::score_stats
1705: ([&Apache::lonstatistics::get_selected_sections()],
1706: [&Apache::lonstatistics::get_selected_groups()],
1707: $Apache::lonstatistics::enrollment_status,
1708: \@Resources,$starttime,$endtime,undef);
1709: $SeqStat{$symb}->{'title'} = $seq->compTitle;
1710: $SeqStat{$symb}->{'scoremax'} = $smax;
1711: $SeqStat{$symb}->{'scoremin'} = $smin;
1712: $SeqStat{$symb}->{'scoremean'} = $sMean;
1713: $SeqStat{$symb}->{'scorestd'} = $sSTD;
1714: $SeqStat{$symb}->{'scorecount'} = $scount;
1715: $SeqStat{$symb}->{'max_possible'} = $sMAX;
1716: #
1717: # Compute statistics based on the number of correct problems
1718: # 'correct' is taken to mean
1719: my ($cmin,$cmax,$cMean,$cSTD,$ccount)=
1720: &Apache::loncoursedata::count_stats
1721: ([&Apache::lonstatistics::get_selected_sections()],
1722: [&Apache::lonstatistics::get_selected_groups()],
1723: $Apache::lonstatistics::enrollment_status,
1724: \@Resources,$starttime,$endtime,undef);
1725: my $K = $part_count;
1726: my $kr_21;
1727: if ($K > 1 && $cSTD > 0) {
1728: $kr_21 = ($K/($K-1)) * (1 - $cMean*($K-$cMean)/($K*$cSTD**2));
1729: } else {
1730: $kr_21 = 'nan';
1731: }
1732: $SeqStat{$symb}->{'countmax'} = $cmax;
1733: $SeqStat{$symb}->{'countmin'} = $cmin;
1734: $SeqStat{$symb}->{'countstd'} = $cSTD;
1735: $SeqStat{$symb}->{'countmean'} = $cMean;
1736: $SeqStat{$symb}->{'count'} = $ccount;
1737: $SeqStat{$symb}->{'items'} = $K;
1738: $SeqStat{$symb}->{'KR-21'}=$kr_21;
1739: return;
1740: }
1741:
1742:
1743:
1744: =pod
1745:
1746: =item ProblemStatisticsLegend
1747:
1748: =over 4
1749:
1750: =item #Stdnts
1751: Total number of students attempted the problem.
1752:
1753: =item Tries
1754: Total number of tries for solving the problem.
1755:
1756: =item Max Tries
1757: Largest number of tries for solving the problem by a student.
1758:
1759: =item Mean
1760: Average number of tries. [ Tries / #Stdnts ]
1761:
1762: =item #YES
1763: Number of students solved the problem correctly.
1764:
1765: =item #yes
1766: Number of students solved the problem by override.
1767:
1768: =item %Wrong
1769: Percentage of students who tried to solve the problem
1770: but is still incorrect. [ 100*((#Stdnts-(#YES+#yes))/#Stdnts) ]
1771:
1772: =item DoDiff
1773: Degree of Difficulty of the problem.
1774: [ 1 - ((#YES+#yes) / Tries) ]
1775:
1776: =item S.D.
1777: Standard Deviation of the tries.
1778: [ sqrt(sum((Xi - Mean)^2)) / (#Stdnts-1)
1779: where Xi denotes every student\'s tries ]
1780:
1781: =item Skew.
1782: Skewness of the students tries.
1783: [(sqrt( sum((Xi - Mean)^3) / #Stdnts)) / (S.D.^3)]
1784:
1785: =item Dis.F.
1786: Discrimination Factor: A Standard for evaluating the
1787: problem according to a Criterion<br>
1788:
1789: =item [Criterion to group students into %27 Upper Students -
1790: and %27 Lower Students]
1791: 1st Criterion for Sorting the Students:
1792: Sum of Partial Credit Awarded / Total Number of Tries
1793: 2nd Criterion for Sorting the Students:
1794: Total number of Correct Answers / Total Number of Tries
1795:
1796: =item Disc.
1797: Number of Students had at least one discussion.
1798:
1799: =back
1800:
1801: =cut
1802:
1803: ############################################################
1804: ############################################################
1805:
1806: 1;
1807: __END__
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>
![[BACK]](/icons/back.gif){kind=icon}
Return to lonproblemstatistics.pm CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [LON-CAPA] / loncom / interface / statistics