Annotation of loncom/interface/statistics/lonproblemstatistics.pm, revision 1.117
1.1 stredwic 1: # The LearningOnline Network with CAPA
2: #
1.117 ! bisitz 3: # $Id: lonproblemstatistics.pm,v 1.116 2009/01/20 16:38:44 bisitz Exp $
1.1 stredwic 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: #
1.47 matthew 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: ###############################################
1.1 stredwic 49:
1.36 minaeibi 50: package Apache::lonproblemstatistics;
1.1 stredwic 51:
52: use strict;
1.104 albertel 53: use Apache::lonnet;
1.62 matthew 54: use Apache::loncommon();
1.1 stredwic 55: use Apache::lonhtmlcommon;
56: use Apache::loncoursedata;
1.41 matthew 57: use Apache::lonstatistics;
1.84 matthew 58: use LONCAPA::lonmetadata();
1.59 matthew 59: use Apache::lonlocal;
1.44 matthew 60: use Spreadsheet::WriteExcel;
1.70 matthew 61: use Apache::lonstathelpers();
1.71 matthew 62: use Time::HiRes;
1.109 www 63: use LONCAPA;
64:
1.73 matthew 65:
66: my @StatsArray;
1.79 matthew 67: my %SeqStat; # keys are symbs, values are hash refs
1.73 matthew 68:
1.59 matthew 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: ##
1.79 matthew 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: ##
1.85 matthew 101: ## format no sprintf format string
102: ##
103: ## excel_format no excel format type
104: ## (see &Apache::loncommon::define_excel_formats
1.49 matthew 105: my @Fields = (
106: { name => 'problem_num',
107: title => 'P#',
108: align => 'right',
1.76 matthew 109: color => '#FFFFE6',
110: selectable => 'no',
1.80 matthew 111: defaultselected => 'yes',
1.76 matthew 112: },
1.49 matthew 113: { name => 'container',
1.51 matthew 114: title => 'Sequence or Folder',
1.49 matthew 115: align => 'left',
116: color => '#FFFFE6',
1.76 matthew 117: sortable => 'yes',
118: selectable => 'no',
1.80 matthew 119: defaultselected => 'yes',
1.76 matthew 120: },
1.49 matthew 121: { name => 'title',
122: title => 'Title',
123: align => 'left',
124: color => '#FFFFE6',
125: special => 'link',
1.117 ! bisitz 126: sortable => 'yes',
1.76 matthew 127: selectable => 'no',
1.80 matthew 128: defaultselected => 'yes',
1.76 matthew 129: },
1.117 ! bisitz 130: { name => 'part',
1.49 matthew 131: title => 'Part',
132: align => 'left',
1.55 matthew 133: color => '#FFFFE6',
1.76 matthew 134: selectable => 'no',
1.80 matthew 135: defaultselected => 'yes',
1.76 matthew 136: },
1.49 matthew 137: { name => 'num_students',
138: title => '#Stdnts',
139: align => 'right',
140: color => '#EEFFCC',
141: format => '%d',
142: sortable => 'yes',
143: graphable => 'yes',
1.76 matthew 144: long_title => 'Number of Students Attempting Problem',
145: selectable => 'yes',
1.80 matthew 146: defaultselected => 'yes',
1.76 matthew 147: },
1.49 matthew 148: { name => 'tries',
149: title => 'Tries',
150: align => 'right',
151: color => '#EEFFCC',
152: format => '%d',
153: sortable => 'yes',
154: graphable => 'yes',
1.76 matthew 155: long_title => 'Total Number of Tries',
156: selectable => 'yes',
1.80 matthew 157: defaultselected => 'yes',
1.76 matthew 158: },
1.49 matthew 159: { name => 'max_tries',
160: title => 'Max Tries',
161: align => 'right',
162: color => '#DDFFFF',
163: format => '%d',
164: sortable => 'yes',
165: graphable => 'yes',
1.76 matthew 166: long_title => 'Maximum Number of Tries',
167: selectable => 'yes',
1.80 matthew 168: defaultselected => 'yes',
1.76 matthew 169: },
1.73 matthew 170: { name => 'min_tries',
171: title => 'Min Tries',
172: align => 'right',
173: color => '#DDFFFF',
174: format => '%d',
175: sortable => 'yes',
176: graphable => 'yes',
1.76 matthew 177: long_title => 'Minumum Number of Tries',
178: selectable => 'yes',
1.80 matthew 179: defaultselected => 'yes',
1.76 matthew 180: },
1.49 matthew 181: { name => 'mean_tries',
182: title => 'Mean Tries',
183: align => 'right',
184: color => '#DDFFFF',
185: format => '%5.2f',
186: sortable => 'yes',
187: graphable => 'yes',
1.76 matthew 188: long_title => 'Average Number of Tries',
189: selectable => 'yes',
1.80 matthew 190: defaultselected => 'yes',
1.76 matthew 191: },
1.49 matthew 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',
1.76 matthew 199: long_title => 'Standard Deviation of Number of Tries',
200: selectable => 'yes',
1.80 matthew 201: defaultselected => 'yes',
1.76 matthew 202: },
1.49 matthew 203: { name => 'skew_tries',
204: title => 'Skew Tries',
205: align => 'right',
206: color => '#DDFFFF',
207: format => '%5.2f',
208: sortable => 'yes',
209: graphable => 'yes',
1.76 matthew 210: long_title => 'Skew of Number of Tries',
211: selectable => 'yes',
1.80 matthew 212: defaultselected => 'no',
1.76 matthew 213: },
1.49 matthew 214: { name => 'num_solved',
215: title => '#YES',
216: align => 'right',
217: color => '#FFDDDD',
1.63 matthew 218: format => '%4.1f',# format => '%d',
1.49 matthew 219: sortable => 'yes',
220: graphable => 'yes',
1.76 matthew 221: long_title => 'Number of Students able to Solve',
1.77 matthew 222: selectable => 'yes',
1.80 matthew 223: defaultselected => 'yes',
1.76 matthew 224: },
1.49 matthew 225: { name => 'num_override',
226: title => '#yes',
227: align => 'right',
228: color => '#FFDDDD',
1.63 matthew 229: format => '%4.1f',# format => '%d',
1.49 matthew 230: sortable => 'yes',
231: graphable => 'yes',
1.76 matthew 232: long_title => 'Number of Students given Override',
233: selectable => 'yes',
1.80 matthew 234: defaultselected => 'yes',
1.76 matthew 235: },
1.95 matthew 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: },
1.73 matthew 247: { name => 'num_wrong',
248: title => '#Wrng',
1.49 matthew 249: align => 'right',
1.73 matthew 250: color => '#FFDDDD',
1.49 matthew 251: format => '%4.1f',
252: sortable => 'yes',
253: graphable => 'yes',
1.93 matthew 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',
1.76 matthew 265: long_title => 'Percent of students whose final answer is wrong',
266: selectable => 'yes',
1.80 matthew 267: defaultselected => 'yes',
1.76 matthew 268: },
1.73 matthew 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'.
1.76 matthew 277: '[ 1 - ((#YES+#yes) / Tries) ]',
278: selectable => 'yes',
1.80 matthew 279: defaultselected => 'yes',
1.76 matthew 280: },
1.71 matthew 281: { name => 'deg_of_disc',
1.73 matthew 282: title => 'DoDisc',
1.71 matthew 283: align => 'right',
284: color => '#FFFFE6',
285: format => '%4.2f',
286: sortable => 'yes',
287: graphable => 'yes',
1.76 matthew 288: long_title => 'Degree of Discrimination',
289: selectable => 'yes',
1.89 matthew 290: defaultselected => 'yes',
1.76 matthew 291: },
1.85 matthew 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: # },
1.86 matthew 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: # },
1.94 matthew 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: # },
1.98 matthew 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)',
1.100 matthew 367: selectable => 'yes',
1.98 matthew 368: defaultselected => 'yes',
369: },
1.49 matthew 370: );
371:
1.79 matthew 372: my @SeqFields = (
373: { name => 'title',
374: title => 'Sequence',
375: align => 'left',
376: color => '#FFFFE6',
377: special => 'no',
1.117 ! bisitz 378: sortable => 'no',
1.79 matthew 379: selectable => 'yes',
1.80 matthew 380: defaultselected => 'no',
1.79 matthew 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',
1.80 matthew 391: defaultselected => 'no',
1.79 matthew 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',
1.80 matthew 402: defaultselected => 'no',
1.79 matthew 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',
1.80 matthew 413: defaultselected => 'no',
1.79 matthew 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',
1.80 matthew 424: defaultselected => 'no',
1.79 matthew 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',
1.80 matthew 435: defaultselected => 'no',
1.79 matthew 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',
1.80 matthew 446: defaultselected => 'no',
1.79 matthew 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',
1.80 matthew 457: defaultselected => 'no',
1.79 matthew 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',
1.80 matthew 468: defaultselected => 'no',
1.79 matthew 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',
1.80 matthew 479: defaultselected => 'no',
1.79 matthew 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',
1.80 matthew 490: defaultselected => 'no',
1.79 matthew 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',
1.80 matthew 501: defaultselected => 'no',
1.79 matthew 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',
1.80 matthew 512: defaultselected => 'no',
1.117 ! bisitz 513: },
1.79 matthew 514: );
515:
1.76 matthew 516: my %SelectedFields;
517:
518: sub parse_field_selection {
519: #
520: # Pull out the defaults
1.104 albertel 521: if (! defined($env{'form.fieldselections'})) {
522: $env{'form.fieldselections'} = [];
1.76 matthew 523: foreach my $field (@Fields) {
524: next if ($field->{'selectable'} ne 'yes');
1.80 matthew 525: if ($field->{'defaultselected'} eq 'yes') {
1.104 albertel 526: push(@{$env{'form.fieldselections'}},$field->{'name'});
1.76 matthew 527: }
528: }
529: }
530: #
1.80 matthew 531: # Make sure the data we are plotting is there
532: my %NeededFields;
1.104 albertel 533: if (exists($env{'form.plot'}) && $env{'form.plot'} ne '' &&
534: $env{'form.plot'} ne 'none') {
535: if ($env{'form.plot'} eq 'degrees') {
1.80 matthew 536: $NeededFields{'deg_of_diff'}++;
537: $NeededFields{'deg_of_disc'}++;
1.104 albertel 538: } elsif ($env{'form.plot'} eq 'tries statistics') {
1.80 matthew 539: $NeededFields{'mean_tries'}++;
540: $NeededFields{'std_tries'}++;
541: $NeededFields{'problem_num'}++;
542: } else {
1.104 albertel 543: $NeededFields{$env{'form.plot'}}++;
1.80 matthew 544: }
545: }
546: #
1.76 matthew 547: # This should not happen, but in case it does...
1.104 albertel 548: if (ref($env{'form.fieldselections'}) ne 'ARRAY') {
549: $env{'form.fieldselections'} = [$env{'form.fieldselections'}];
1.76 matthew 550: }
551: #
552: # Set the field data and the selected fields (for easier checking)
553: undef(%SelectedFields);
554: foreach my $field (@Fields) {
1.80 matthew 555: if ($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: }
1.104 albertel 564: foreach my $selection (@{$env{'form.fieldselections'}}) {
1.76 matthew 565: if ($selection eq $field->{'name'} || $selection eq 'all') {
566: $field->{'selected'} = 'yes';
567: $SelectedFields{$field->{'name'}}++;
568: }
569: }
570: }
1.82 matthew 571: #
572: # Always show all the sequence statistics (for now)
573: foreach my $field (@SeqFields) {
574: $field->{'selected'} = 'yes';
575: }
1.76 matthew 576: return;
577: }
578:
579: sub field_selection_input {
1.116 bisitz 580: my $Str = '<select name="fieldselections" multiple="multiple" size="5">'."\n";
1.76 matthew 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: $Str .= "</select>\n";
591: }
592:
1.47 matthew 593: ###############################################
594: ###############################################
595:
596: =pod
597:
598: =item &CreateInterface()
599:
600: Create the main intereface for the statistics page. Allows the user to
601: select sections, maps, and output.
602:
603: =cut
1.1 stredwic 604:
1.47 matthew 605: ###############################################
606: ###############################################
1.41 matthew 607: sub CreateInterface {
1.87 matthew 608: my ($r) = @_;
1.80 matthew 609: #
1.76 matthew 610: &parse_field_selection();
1.80 matthew 611: #
1.41 matthew 612: my $Str = '';
1.107 albertel 613: $Str .= &Apache::lonhtmlcommon::breadcrumbs('Overall Problem Statistics',
614: 'Statistics_Overall_Key');
1.115 bisitz 615: $Str .= '<p>';
616: $Str .= &Apache::loncommon::start_data_table();
617: $Str .= &Apache::loncommon::start_data_table_header_row();
618: $Str .= '<th>'.&mt('Sections').'</th>';
619: $Str .= '<th>'.&mt('Groups').'</th>';
620: $Str .= '<th>'.&mt('Access Status').'</th>';
621: $Str .= '<th>'.&mt('Sequences and Folders').'</th>';
622: $Str .= '<th>'.&mt('Statistics').'</th>';
623: $Str .= '<th>'.&mt('Plot Graph').'</th>';
624: $Str .= '<th>'.&mt('Time Period').'</th>';
625: $Str .= &Apache::loncommon::end_data_table_header_row();
1.41 matthew 626: #
1.115 bisitz 627: $Str .= &Apache::loncommon::start_data_table_row();
628: $Str .= '<td align="center" valign="top">'."\n";
1.41 matthew 629: $Str .= &Apache::lonstatistics::SectionSelect('Section','multiple',5);
1.115 bisitz 630: $Str .= '</td><td align="center" valign="top">';
1.108 raeburn 631: $Str .= &Apache::lonstatistics::GroupSelect('Group','multiple',5);
1.115 bisitz 632: $Str .= '</td><td align="center" valign="top">';
1.50 matthew 633: $Str .= &Apache::lonhtmlcommon::StatusOptions(undef,undef,5);
1.115 bisitz 634: $Str .= '</td><td align="center" valign="top">';
1.41 matthew 635: #
1.97 matthew 636: $Str .= &Apache::lonstatistics::map_select('Maps','multiple,all',5);
1.115 bisitz 637: $Str .= '</td><td align="center" valign="top">';
638: $Str .= &field_selection_input();
639: $Str .= '</td><td align="center" valign="top">';
640: $Str .= &plot_dropdown();
641: $Str .= '</td>'."\n";
642: $Str .= '</td><td align="center" valign="top">';
643: $Str .= &Apache::lonstathelpers::limit_by_time_form();
644: $Str .= '</td>'."\n";
645: $Str .= &Apache::loncommon::end_data_table_row();
646: $Str .= &Apache::loncommon::end_data_table();
1.87 matthew 647: #
1.114 bisitz 648: $Str .= '<p><span class="LC_nobreak">'
649: .&mt('Status: [_1]',
650: '<input type="text" name="stats_status"'
651: .' size="60" value="" readonly="readonly" />')
652: .'</span></p>';
1.87 matthew 653: #
1.115 bisitz 654: $Str .= '</p>';
1.59 matthew 655: $Str .= '<input type="submit" name="GenerateStatistics" value="'.
656: &mt('Generate Statistics').'" />';
1.115 bisitz 657: $Str .= (' 'x10);
1.87 matthew 658: #
1.73 matthew 659: return $Str;
1.41 matthew 660: }
1.25 stredwic 661:
1.41 matthew 662: ###############################################
663: ###############################################
1.28 stredwic 664:
1.47 matthew 665: =pod
666:
667: =item &BuildProblemStatisticsPage()
668:
669: Main interface to problem statistics.
670:
671: =cut
672:
1.41 matthew 673: ###############################################
674: ###############################################
1.97 matthew 675: my $navmap;
676: my @sequences;
677:
1.105 albertel 678: sub clean_up {
679: undef($navmap);
680: undef(@sequences);
681: }
682:
1.41 matthew 683: sub BuildProblemStatisticsPage {
684: my ($r,$c)=@_;
1.97 matthew 685: undef($navmap);
686: undef(@sequences);
1.61 matthew 687: #
688: my %Saveable_Parameters = ('Status' => 'scalar',
689: 'statsoutputmode' => 'scalar',
690: 'Section' => 'array',
1.108 raeburn 691: 'Groups' => 'array',
1.61 matthew 692: 'StudentData' => 'array',
1.77 matthew 693: 'Maps' => 'array',
694: 'fieldselections'=> 'array');
1.61 matthew 695: &Apache::loncommon::store_course_settings('statistics',
696: \%Saveable_Parameters);
697: &Apache::loncommon::restore_course_settings('statistics',
698: \%Saveable_Parameters);
699: #
700: &Apache::lonstatistics::PrepareClasslist();
1.41 matthew 701: #
1.73 matthew 702: # Clear the package variables
703: undef(@StatsArray);
1.79 matthew 704: undef(%SeqStat);
1.71 matthew 705: #
1.73 matthew 706: # Finally let the user know we are here
1.87 matthew 707: my $interface = &CreateInterface($r);
1.57 matthew 708: $r->print($interface);
1.104 albertel 709: $r->print('<input type="hidden" name="sortby" value="'.$env{'form.sortby'}.
1.41 matthew 710: '" />');
1.73 matthew 711: #
1.117 ! bisitz 712: my @CacheButtonHTML =
1.87 matthew 713: &Apache::lonstathelpers::manage_caches($r,'Statistics','stats_status');
714: my $Str;
715: foreach my $html (@CacheButtonHTML) {
716: $Str.=$html.(' 'x5);
717: }
718: #
719: $r->print($Str);
1.104 albertel 720: if (! exists($env{'form.firstrun'})) {
1.117 ! bisitz 721: $r->print('<p class="LC_info"><b>'.
1.73 matthew 722: &mt('Press "Generate Statistics" when you are ready.').
1.117 ! bisitz 723: '</b></p>'.
! 724: '<p class="LC_info">'.
1.73 matthew 725: &mt('It may take some time to update the student data '.
1.117 ! bisitz 726: 'for the first analysis. Future analysis this session '.
1.113 bisitz 727: 'will not have this delay.').
1.73 matthew 728: '</p>');
1.105 albertel 729: &clean_up();
1.41 matthew 730: return;
1.28 stredwic 731: }
1.73 matthew 732: $r->rflush();
1.41 matthew 733: #
1.73 matthew 734: # This probably does not need to be done each time we are called, but
735: # it does not slow things down noticably.
736: &Apache::loncoursedata::populate_weight_table();
1.75 matthew 737: #
1.117 ! bisitz 738: ($navmap,@sequences) =
1.99 matthew 739: &Apache::lonstatistics::selected_sequences_with_assessments();
740: if (! ref($navmap)) {
1.115 bisitz 741: $r->print('<div class="LC_error">'.&mt('A course-wide error occurred.').'</div>'.
1.99 matthew 742: '<h3>'.$navmap.'</h3>');
1.105 albertel 743: &clean_up();
1.99 matthew 744: return;
745: }
1.104 albertel 746: if (exists($env{'form.Excel'})) {
1.102 matthew 747: $r->print('<h4>'.
748: &Apache::lonstatistics::section_and_enrollment_description().
749: '</h4>');
1.73 matthew 750: &Excel_output($r);
1.117 ! bisitz 751: } else {
1.87 matthew 752: $r->print('<input type="submit" name="Excel" value="'.
753: &mt('Produce Excel Output').'" />'.' 'x5);
754: $r->rflush();
1.102 matthew 755: $r->print('<h4>'.
756: &Apache::lonstatistics::section_and_enrollment_description().
757: '</h4>');
1.75 matthew 758: my $count = 0;
1.97 matthew 759: foreach my $seq (@sequences) {
1.117 ! bisitz 760: my @resources =
1.97 matthew 761: &Apache::lonstathelpers::get_resources($navmap,$seq);
762: $count += scalar(@resources);
1.75 matthew 763: }
764: if ($count > 10) {
765: $r->print('<h2>'.
766: &mt('Compiling statistics for [_1] problems',$count).
767: '</h2>');
768: if ($count > 30) {
769: $r->print('<h3>'.&mt('This will take some time.').'</h3>');
770: }
771: $r->rflush();
772: }
773: #
1.104 albertel 774: my $sortby = $env{'form.sortby'};
1.73 matthew 775: $sortby = 'container' if (! defined($sortby) || $sortby =~ /^\s*$/);
1.104 albertel 776: my $plot = $env{'form.plot'};
1.75 matthew 777: if ($plot eq '' || $plot eq 'none') {
778: undef($plot);
779: }
1.73 matthew 780: if ($sortby eq 'container' && ! defined($plot)) {
1.79 matthew 781: &output_sequence_statistics($r);
1.73 matthew 782: &output_html_by_sequence($r);
783: } else {
784: if (defined($plot)) {
785: &make_plot($r,$plot);
786: }
787: &output_html_stats($r);
1.79 matthew 788: &output_sequence_statistics($r);
1.73 matthew 789: }
790: }
1.105 albertel 791: &clean_up();
1.73 matthew 792: return;
793: }
794:
1.79 matthew 795: sub output_sequence_statistics {
796: my ($r) = @_;
797: my $c=$r->connection();
1.90 matthew 798: $r->print('<h2>'.&mt('Sequence Statistics').
799: &Apache::loncommon::help_open_topic('Statistics_Sequence').
800: '</h2>');
1.79 matthew 801: $r->print('<table border="0"><tr><td bgcolor="#777777">'."\n".
802: '<table border="0" cellpadding="3">'."\n".
803: '<tr bgcolor="#FFFFE6">');
804: $r->print(&sequence_html_header());
1.117 ! bisitz 805: foreach my $seq (@sequences) {
1.79 matthew 806: last if ($c->aborted);
807: &compute_sequence_statistics($seq);
808: $r->print(&sequence_html_output($seq));
809: }
810: $r->print('</table>');
811: $r->print('</table>');
812: $r->rflush();
813: return;
814: }
815:
816:
1.73 matthew 817: ##########################################################
818: ##########################################################
819: ##
820: ## HTML output routines
821: ##
822: ##########################################################
823: ##########################################################
824: sub output_html_by_sequence {
825: my ($r) = @_;
826: my $c = $r->connection();
827: $r->print(&html_preamble());
1.41 matthew 828: #
1.97 matthew 829: foreach my $seq (@sequences) {
1.73 matthew 830: last if ($c->aborted);
1.97 matthew 831: $r->print("<h3>".$seq->compTitle."</h3>".
1.73 matthew 832: '<table border="0"><tr><td bgcolor="#777777">'."\n".
833: '<table border="0" cellpadding="3">'."\n".
834: '<tr bgcolor="#FFFFE6">'.
835: &statistics_table_header('no container')."</tr>\n");
836: my @Data = &compute_statistics_on_sequence($seq);
837: foreach my $data (@Data) {
838: $r->print('<tr>'.&statistics_html_table_data($data,
839: 'no container').
840: "</tr>\n");
1.70 matthew 841: }
1.73 matthew 842: $r->print('</table>'."\n".'</table>'."\n");
1.41 matthew 843: $r->rflush();
1.28 stredwic 844: }
1.41 matthew 845: return;
846: }
1.21 stredwic 847:
1.73 matthew 848: sub output_html_stats {
849: my ($r)=@_;
850: &compute_all_statistics($r);
851: $r->print(&html_preamble());
1.104 albertel 852: &sort_data($env{'form.sortby'});
1.73 matthew 853: #
854: my $count=0;
855: foreach my $data (@StatsArray) {
856: if ($count++ % 50 == 0) {
857: $r->print("</table>\n</table>\n");
858: $r->print('<table border="0"><tr><td bgcolor="#777777">'."\n".
859: '<table border="0" cellpadding="3">'."\n".
860: '<tr bgcolor="#FFFFE6">'.
861: '<tr bgcolor="#FFFFE6">'.
862: &statistics_table_header().
863: "</tr>\n");
864: }
865: $r->print('<tr>'.&statistics_html_table_data($data)."</tr>\n");
866: }
867: $r->print("</table>\n</table>\n");
868: return;
869: }
1.47 matthew 870:
1.73 matthew 871: sub html_preamble {
872: my $Str='';
873: $Str .= "<h2>".
1.104 albertel 874: $env{'course.'.$env{'request.course.id'}.'.description'}.
1.73 matthew 875: "</h2>\n";
876: my ($starttime,$endtime) = &Apache::lonstathelpers::get_time_limits();
877: if (defined($starttime) || defined($endtime)) {
878: # Inform the user what the time limits on the data are.
879: $Str .= '<h3>'.&mt('Statistics on submissions from [_1] to [_2]',
880: &Apache::lonlocal::locallocaltime($starttime),
881: &Apache::lonlocal::locallocaltime($endtime)
882: ).'</h3>';
883: }
884: $Str .= "<h3>".&mt('Compiled on [_1]',
885: &Apache::lonlocal::locallocaltime(time))."</h3>";
886: return $Str;
887: }
1.47 matthew 888:
889:
1.44 matthew 890: ###############################################
891: ###############################################
1.73 matthew 892: ##
893: ## Misc HTML output routines
894: ##
895: ###############################################
896: ###############################################
897: sub statistics_html_table_data {
898: my ($data,$options) = @_;
899: my $row = '';
900: foreach my $field (@Fields) {
901: next if ($options =~ /no $field->{'name'}/);
1.76 matthew 902: next if ($field->{'selected'} ne 'yes');
1.73 matthew 903: $row .= '<td bgcolor="'.$field->{'color'}.'"';
904: if (exists($field->{'align'})) {
905: $row .= ' align="'.$field->{'align'}.'"';
1.41 matthew 906: }
1.73 matthew 907: $row .= '>';
908: if (exists($field->{'special'}) && $field->{'special'} eq 'link') {
909: $row .= '<a href="'.$data->{$field->{'name'}.'.link'}.'">';
1.41 matthew 910: }
1.92 matthew 911: if (exists($field->{'format'}) && $data->{$field->{'name'}} !~ /[A-Z]/i) {
1.73 matthew 912: $row .= sprintf($field->{'format'},$data->{$field->{'name'}});
913: } else {
914: $row .= $data->{$field->{'name'}};
915: }
916: if (exists($field->{'special'}) && $field->{'special'} eq 'link') {
917: $row.= '</a>';
918: }
919: $row .= '</td>';
1.21 stredwic 920: }
1.73 matthew 921: return $row;
1.41 matthew 922: }
1.25 stredwic 923:
1.73 matthew 924: sub statistics_table_header {
925: my ($options) = @_;
926: my $header_row;
927: foreach my $field (@Fields) {
928: next if ($options =~ /no $field->{'name'}/);
1.76 matthew 929: next if ($field->{'selected'} ne 'yes');
1.73 matthew 930: $header_row .= '<th>';
931: if (exists($field->{'sortable'}) && $field->{'sortable'} eq 'yes') {
932: $header_row .= '<a href="javascript:'.
933: 'document.Statistics.sortby.value='."'".$field->{'name'}."'".
934: ';document.Statistics.submit();">';
935: }
936: $header_row .= &mt($field->{'title'});
937: if ($options =~ /sortable/) {
938: $header_row.= '</a>';
939: }
940: if ($options !~ /no plots/ &&
941: exists($field->{'graphable'}) &&
942: $field->{'graphable'} eq 'yes') {
943: $header_row.=' (';
944: $header_row .= '<a href="javascript:'.
945: "document.Statistics.plot.value='$field->{'name'}'".
946: ';document.Statistics.submit();">';
947: $header_row .= &mt('plot').'</a>)';
948: }
949: $header_row .= '</th>';
950: }
951: return $header_row;
952: }
1.26 stredwic 953:
1.79 matthew 954: sub sequence_html_header {
955: my $Str .= '<tr>';
956: foreach my $field (@SeqFields) {
957: # next if ($field->{'selected'} ne 'yes');
958: $Str .= '<th bgcolor="'.$field->{'color'}.'"';
959: $Str .= '>'.$field->{'title'}.'</th>';
960: }
961: $Str .= '</tr>';
962: return $Str;
963: }
964:
965:
966: sub sequence_html_output {
967: my ($seq) = @_;
1.97 matthew 968: my $data = $SeqStat{$seq->symb};
1.79 matthew 969: my $row = '<tr>';
970: foreach my $field (@SeqFields) {
1.82 matthew 971: next if ($field->{'selected'} ne 'yes');
1.79 matthew 972: $row .= '<td bgcolor="'.$field->{'color'}.'"';
973: if (exists($field->{'align'})) {
974: $row .= ' align="'.$field->{'align'}.'"';
975: }
976: $row .= '>';
977: if (exists($field->{'format'})) {
978: $row .= sprintf($field->{'format'},$data->{$field->{'name'}});
979: } else {
980: $row .= $data->{$field->{'name'}};
981: }
982: $row .= '</td>';
983: }
984: $row .= '</tr>'."\n";
985: return $row;
986: }
987:
1.73 matthew 988: ####################################################
989: ####################################################
990: ##
991: ## Plotting Routines
992: ##
993: ####################################################
994: ####################################################
995: sub make_plot {
996: my ($r,$plot) = @_;
997: &compute_all_statistics($r);
1.104 albertel 998: &sort_data($env{'form.sortby'});
1.73 matthew 999: if ($plot eq 'degrees') {
1000: °rees_plot($r);
1.74 matthew 1001: } elsif ($plot eq 'tries statistics') {
1002: &tries_data_plot($r);
1.73 matthew 1003: } else {
1004: &make_single_stat_plot($r,$plot);
1005: }
1006: return;
1007: }
1.47 matthew 1008:
1.73 matthew 1009: sub make_single_stat_plot {
1010: my ($r,$datafield) = @_;
1.41 matthew 1011: #
1.73 matthew 1012: my $title; my $yaxis;
1013: foreach my $field (@Fields) {
1014: next if ($field->{'name'} ne $datafield);
1015: $title = $field->{'long_title'};
1016: $yaxis = $field->{'title'};
1017: last;
1018: }
1019: if ($title eq '' || $yaxis eq '') {
1020: # datafield is something we do not know enough about to plot
1021: $r->print('<h3>'.
1022: &mt('Unable to plot the requested statistic.').
1023: '</h3>');
1024: return;
1.49 matthew 1025: }
1026: #
1.73 matthew 1027: # Build up the data sets to plot
1.117 ! bisitz 1028: my @Labels;
1.73 matthew 1029: my @Data;
1030: my $max = 1;
1031: foreach my $data (@StatsArray) {
1032: push(@Labels,$data->{'problem_num'});
1033: push(@Data,$data->{$datafield});
1034: if ($data->{$datafield}>$max) {
1035: $max = $data->{$datafield};
1036: }
1037: }
1038: foreach (1,2,3,4,5,10,15,20,25,40,50,75,100,150,200,250,300,500,600,750,
1039: 1000,1500,2000,2500,3000,3500,4000,5000,7500,10000,15000,20000) {
1040: if ($max <= $_) {
1041: $max = $_;
1042: last;
1.42 matthew 1043: }
1044: }
1.73 matthew 1045: if ($max > 20000) {
1046: $max = 10000*(int($max/10000)+1);
1.42 matthew 1047: }
1.73 matthew 1048: #
1049: $r->print("<p>".&Apache::loncommon::DrawBarGraph($title,
1050: 'Problem Number',
1051: $yaxis,
1052: $max,
1053: undef, # colors
1054: \@Labels,
1055: \@Data)."</p>\n");
1056: return;
1057: }
1058:
1059: sub degrees_plot {
1060: my ($r)=@_;
1061: my $count = scalar(@StatsArray);
1062: my $width = 50 + 10*$count;
1063: $width = 300 if ($width < 300);
1064: my $height = 300;
1065: my $plot = '';
1066: my $ymax = 0;
1067: my $ymin = 0;
1.117 ! bisitz 1068: my @Disc; my @Diff; my @Labels;
1.73 matthew 1069: foreach my $data (@StatsArray) {
1070: push(@Labels,$data->{'problem_num'});
1071: my $disc = $data->{'deg_of_disc'};
1072: my $diff = $data->{'deg_of_diff'};
1073: push(@Disc,$disc);
1074: push(@Diff,$diff);
1075: #
1076: $ymin = $disc if ($ymin > $disc);
1077: $ymin = $diff if ($ymin > $diff);
1078: $ymax = $disc if ($ymax < $disc);
1079: $ymax = $diff if ($ymax < $diff);
1080: }
1081: #
1082: # Make sure we show relevant information.
1083: if ($ymin < 0) {
1084: if (abs($ymin) < 0.05) {
1085: $ymin = 0;
1086: } else {
1087: $ymin = -1;
1.42 matthew 1088: }
1089: }
1.73 matthew 1090: if ($ymax > 0) {
1091: if (abs($ymax) < 0.05) {
1092: $ymax = 0;
1.42 matthew 1093: } else {
1.73 matthew 1094: $ymax = 1;
1.42 matthew 1095: }
1.43 matthew 1096: }
1.49 matthew 1097: #
1.73 matthew 1098: my $xmax = $Labels[-1];
1099: if ($xmax > 50) {
1100: if ($xmax % 10 != 0) {
1101: $xmax = 10 * (int($xmax/10)+1);
1102: }
1103: } else {
1104: if ($xmax % 5 != 0) {
1105: $xmax = 5 * (int($xmax/5)+1);
1.49 matthew 1106: }
1.26 stredwic 1107: }
1.41 matthew 1108: #
1.73 matthew 1109: my $discdata .= '<data>'.join(',',@Labels).'</data>'.$/.
1110: '<data>'.join(',',@Disc).'</data>'.$/;
1111: #
1112: my $diffdata .= '<data>'.join(',',@Labels).'</data>'.$/.
1113: '<data>'.join(',',@Diff).'</data>'.$/;
1114: #
1.81 matthew 1115: my $title = 'Degree of Discrimination\nand Degree of Difficulty';
1116: if ($xmax > 50) {
1117: $title = 'Degree of Discrimination and Degree of Difficulty';
1118: }
1119: #
1.73 matthew 1120: $plot=<<"END";
1121: <gnuplot
1122: texfont="10"
1123: fgcolor="x000000"
1124: plottype="Cartesian"
1125: font="large"
1126: grid="on"
1127: align="center"
1128: border="on"
1129: transparent="on"
1.81 matthew 1130: alttag="Degree of Discrimination and Degree of Difficulty Plot"
1.73 matthew 1131: samples="100"
1132: bgcolor="xffffff"
1133: height="$height"
1134: width="$width">
1135: <key
1136: pos="top right"
1137: title=""
1138: box="off" />
1.81 matthew 1139: <title>$title</title>
1.73 matthew 1140: <axis xmin="0" ymin="$ymin" xmax="$xmax" ymax="$ymax" color="x000000" />
1141: <xlabel>Problem Number</xlabel>
1142: <curve
1143: linestyle="linespoints"
1144: name="DoDisc"
1145: pointtype="0"
1146: color="x000000">
1147: $discdata
1148: </curve>
1149: <curve
1150: linestyle="linespoints"
1151: name="DoDiff"
1152: pointtype="0"
1153: color="xFF0000">
1154: $diffdata
1155: </curve>
1156: </gnuplot>
1157: END
1.117 ! bisitz 1158: my $plotresult =
1.73 matthew 1159: '<p>'.&Apache::lonxml::xmlparse($r,'web',$plot).'</p>'.$/;
1160: $r->print($plotresult);
1.41 matthew 1161: return;
1.42 matthew 1162: }
1163:
1.74 matthew 1164: sub tries_data_plot {
1165: my ($r)=@_;
1166: my $count = scalar(@StatsArray);
1167: my $width = 50 + 10*$count;
1168: $width = 300 if ($width < 300);
1169: my $height = 300;
1170: my $plot = '';
1171: my @STD; my @Mean; my @Max; my @Min;
1172: my @Labels;
1173: my $ymax = 5;
1174: foreach my $data (@StatsArray) {
1175: my $max = $data->{'mean_tries'} + $data->{'std_tries'};
1176: $ymax = $max if ($ymax < $max);
1177: $ymax = $max if ($ymax < $max);
1178: push(@Labels,$data->{'problem_num'});
1179: push(@STD,$data->{'std_tries'});
1180: push(@Mean,$data->{'mean_tries'});
1181: }
1182: #
1183: # Make sure we show relevant information.
1184: my $xmax = $Labels[-1];
1185: if ($xmax > 50) {
1186: if ($xmax % 10 != 0) {
1187: $xmax = 10 * (int($xmax/10)+1);
1188: }
1189: } else {
1190: if ($xmax % 5 != 0) {
1191: $xmax = 5 * (int($xmax/5)+1);
1192: }
1193: }
1194: $ymax = int($ymax)+1+2;
1195: #
1196: my $std_data .= '<data>'.join(',',@Labels).'</data>'.$/.
1197: '<data>'.join(',',@Mean).'</data>'.$/;
1198: #
1199: my $std_error_data .= '<data>'.join(',',@Labels).'</data>'.$/.
1200: '<data>'.join(',',@Mean).'</data>'.$/.
1201: '<data>'.join(',',@STD).'</data>'.$/;
1202: #
1.81 matthew 1203: my $title = 'Mean and S.D. of Tries';
1204: if ($xmax > 25) {
1205: $title = 'Mean and Standard Deviation of Tries';
1206: }
1207: #
1.74 matthew 1208: $plot=<<"END";
1209: <gnuplot
1210: texfont="10"
1211: fgcolor="x000000"
1212: plottype="Cartesian"
1213: font="large"
1214: grid="on"
1215: align="center"
1216: border="on"
1217: transparent="on"
1.81 matthew 1218: alttag="Mean and S.D of Tries Plot"
1.74 matthew 1219: samples="100"
1220: bgcolor="xffffff"
1221: height="$height"
1222: width="$width">
1.81 matthew 1223: <title>$title</title>
1.74 matthew 1224: <axis xmin="0" ymin="0" xmax="$xmax" ymax="$ymax" color="x000000" />
1225: <xlabel>Problem Number</xlabel>
1.81 matthew 1226: <ylabel>Number of Tries</ylabel>
1.74 matthew 1227: <curve
1228: linestyle="yerrorbars"
1229: name="S.D. Tries"
1230: pointtype="1"
1231: color="x666666">
1232: $std_error_data
1233: </curve>
1234: <curve
1235: linestyle="points"
1236: name="Mean Tries"
1237: pointtype="1"
1238: color="xCC4444">
1239: $std_data
1240: </curve>
1241: </gnuplot>
1242: END
1.117 ! bisitz 1243: my $plotresult =
1.74 matthew 1244: '<p>'.&Apache::lonxml::xmlparse($r,'web',$plot).'</p>'.$/;
1245: $r->print($plotresult);
1246: return;
1247: }
1248:
1.73 matthew 1249: sub plot_dropdown {
1250: my $current = '';
1251: #
1.104 albertel 1252: if (defined($env{'form.plot'})) {
1253: $current = $env{'form.plot'};
1.73 matthew 1254: }
1255: #
1256: my @Additional_Plots = (
1257: { graphable=>'yes',
1258: name => 'degrees',
1.81 matthew 1259: title => 'Difficulty Indexes' },
1.74 matthew 1260: { graphable=>'yes',
1261: name => 'tries statistics',
1.81 matthew 1262: title => 'Tries Statistics' });
1.73 matthew 1263: #
1264: my $Str= "\n".'<select name="plot" size="1">';
1265: $Str .= '<option name="none"></option>'."\n";
1266: $Str .= '<option name="none2">none</option>'."\n";
1.81 matthew 1267: foreach my $field (@Additional_Plots,@Fields) {
1.73 matthew 1268: if (! exists($field->{'graphable'}) ||
1269: $field->{'graphable'} ne 'yes') {
1270: next;
1271: }
1272: $Str .= '<option value="'.$field->{'name'}.'"';
1273: if ($field->{'name'} eq $current) {
1274: $Str .= ' selected ';
1275: }
1276: $Str.= '>'.&mt($field->{'title'}).'</option>'."\n";
1277: }
1278: $Str .= '</select>'."\n";
1279: return $Str;
1280: }
1281:
1.41 matthew 1282: ###############################################
1283: ###############################################
1.73 matthew 1284: ##
1285: ## Excel output routines
1286: ##
1.41 matthew 1287: ###############################################
1288: ###############################################
1.73 matthew 1289: sub Excel_output {
1.44 matthew 1290: my ($r) = @_;
1.73 matthew 1291: $r->print('<h2>'.&mt('Preparing Excel Spreadsheet').'</h2>');
1292: ##
1293: ## Compute the statistics
1294: &compute_all_statistics($r);
1295: my $c = $r->connection;
1296: return if ($c->aborted());
1.101 matthew 1297: #
1298: my ($starttime,$endtime) = &Apache::lonstathelpers::get_time_limits();
1.73 matthew 1299: ##
1300: ## Create the excel workbook
1.101 matthew 1301: my ($excel_workbook,$filename,$format) =
1302: &Apache::loncommon::create_workbook($r);
1303: return if (! defined($excel_workbook));
1.44 matthew 1304: #
1305: # Add a worksheet
1.104 albertel 1306: my $sheetname = $env{'course.'.$env{'request.course.id'}.'.description'};
1.44 matthew 1307: if (length($sheetname) > 31) {
1308: $sheetname = substr($sheetname,0,31);
1309: }
1.73 matthew 1310: my $excel_sheet = $excel_workbook->addworksheet(
1311: &Apache::loncommon::clean_excel_name($sheetname));
1312: ##
1313: ## Begin creating excel sheet
1314: ##
1315: my ($rows_output,$cols_output) = (0,0);
1.44 matthew 1316: #
1317: # Put the course description in the header
1318: $excel_sheet->write($rows_output,$cols_output++,
1.104 albertel 1319: $env{'course.'.$env{'request.course.id'}.'.description'},
1.82 matthew 1320: $format->{'h1'});
1.44 matthew 1321: $cols_output += 3;
1322: #
1323: # Put a description of the sections listed
1324: my $sectionstring = '';
1.82 matthew 1325: $excel_sheet->write($rows_output,$cols_output++,
1.103 matthew 1326: &Apache::lonstatistics::section_and_enrollment_description('plaintext'),
1.82 matthew 1327: $format->{'h3'});
1.102 matthew 1328: $cols_output += scalar(&Apache::lonstatistics::get_selected_sections());
1.108 raeburn 1329: $cols_output += scalar(&Apache::lonstatistics::get_selected_groups());
1.44 matthew 1330: #
1.70 matthew 1331: # Time restrictions
1332: my $time_string;
1333: if (defined($starttime)) {
1334: # call localtime but not lonlocal:locallocaltime because excel probably
1335: # cannot handle localized text. Probably.
1336: $time_string .= 'Data collected from '.localtime($time_string);
1337: if (defined($endtime)) {
1338: $time_string .= ' to '.localtime($endtime);
1339: }
1340: $time_string .= '.';
1341: } elsif (defined($endtime)) {
1342: # See note above about lonlocal:locallocaltime
1343: $time_string .= 'Data collected before '.localtime($endtime).'.';
1344: }
1.82 matthew 1345: if (defined($time_string)) {
1346: $excel_sheet->write($rows_output,$cols_output++,$time_string);
1347: $cols_output+= 5;
1348: }
1.70 matthew 1349: #
1.44 matthew 1350: # Put the date in there too
1351: $excel_sheet->write($rows_output,$cols_output++,
1352: 'Compiled on '.localtime(time));
1353: #
1.117 ! bisitz 1354: $rows_output++;
1.44 matthew 1355: $cols_output=0;
1.82 matthew 1356: ##
1357: ## Sequence Statistics
1.117 ! bisitz 1358: ##
1.82 matthew 1359: &write_headers($excel_sheet,$format,\$rows_output,\$cols_output,
1360: \@SeqFields);
1.97 matthew 1361: foreach my $seq (@sequences) {
1362: my $data = $SeqStat{$seq->symb};
1.82 matthew 1363: $cols_output=0;
1364: foreach my $field (@SeqFields) {
1365: next if ($field->{'selected'} ne 'yes');
1.85 matthew 1366: my $fieldformat = undef;
1367: if (exists($field->{'excel_format'})) {
1368: $fieldformat = $format->{$field->{'excel_format'}};
1369: }
1.55 matthew 1370: $excel_sheet->write($rows_output,$cols_output++,
1.85 matthew 1371: $data->{$field->{'name'}},$fieldformat);
1.55 matthew 1372: }
1.82 matthew 1373: $rows_output++;
1374: $cols_output=0;
1.55 matthew 1375: }
1.82 matthew 1376: ##
1377: ## Resource Statistics
1378: ##
1.55 matthew 1379: $rows_output++;
1380: $cols_output=0;
1.82 matthew 1381: &write_headers($excel_sheet,$format,\$rows_output,\$cols_output,
1382: \@Fields);
1383: #
1.73 matthew 1384: foreach my $data (@StatsArray) {
1385: $cols_output=0;
1386: foreach my $field (@Fields) {
1.76 matthew 1387: next if ($field->{'selected'} ne 'yes');
1.73 matthew 1388: next if ($field->{'name'} eq 'problem_num');
1.85 matthew 1389: my $fieldformat = undef;
1390: if (exists($field->{'excel_format'})) {
1391: $fieldformat = $format->{$field->{'excel_format'}};
1392: }
1.73 matthew 1393: $excel_sheet->write($rows_output,$cols_output++,
1.85 matthew 1394: $data->{$field->{'name'}},$fieldformat);
1.44 matthew 1395: }
1.73 matthew 1396: $rows_output++;
1.82 matthew 1397: $cols_output=0;
1.44 matthew 1398: }
1399: #
1400: $excel_workbook->close();
1.73 matthew 1401: #
1.44 matthew 1402: # Tell the user where to get their excel file
1403: $r->print('<br />'.
1.59 matthew 1404: '<a href="'.$filename.'">'.
1405: &mt('Your Excel Spreadsheet').'</a>'."\n");
1.44 matthew 1406: $r->rflush();
1407: return;
1408: }
1409:
1.82 matthew 1410: ##
1411: ## &write_headers
1412: ##
1413: sub write_headers {
1414: my ($excel_sheet,$format,$rows_output,$cols_output,$Fields) = @_;
1415: ##
1416: ## First the long titles
1417: foreach my $field (@{$Fields}) {
1418: next if ($field->{'name'} eq 'problem_num');
1419: next if ($field->{'selected'} ne 'yes');
1420: if (exists($field->{'long_title'})) {
1421: $excel_sheet->write($$rows_output,${$cols_output},
1422: $field->{'long_title'},
1423: $format->{'bold'});
1424: } else {
1425: $excel_sheet->write($$rows_output,${$cols_output},'');
1426: }
1427: ${$cols_output}+= 1;
1428: }
1429: ${$cols_output} =0;
1430: ${$rows_output}+=1;
1431: ##
1432: ## Then the short titles
1433: foreach my $field (@{$Fields}) {
1434: next if ($field->{'selected'} ne 'yes');
1435: next if ($field->{'name'} eq 'problem_num');
1.117 ! bisitz 1436: # Use english for excel as I am not sure how well excel handles
1.82 matthew 1437: # other character sets....
1438: $excel_sheet->write($$rows_output,$$cols_output,
1439: $field->{'title'},
1440: $format->{'bold'});
1441: $$cols_output+=1;
1442: }
1443: ${$cols_output} =0;
1444: ${$rows_output}+=1;
1445: return;
1446: }
1447:
1.73 matthew 1448: ##################################################
1449: ##################################################
1450: ##
1451: ## Statistics Gathering and Manipulation Routines
1452: ##
1453: ##################################################
1454: ##################################################
1455: sub compute_statistics_on_sequence {
1456: my ($seq) = @_;
1457: my @Data;
1.97 matthew 1458: foreach my $res (&Apache::lonstathelpers::get_resources($navmap,$seq)) {
1459: foreach my $part (@{$res->parts}) {
1460: next if ($res->is_survey($part));
1.73 matthew 1461: #
1462: # This is where all the work happens
1463: my $data = &get_statistics($seq,$res,$part,scalar(@StatsArray)+1);
1464: push (@Data,$data);
1465: push (@StatsArray,$data);
1.49 matthew 1466: }
1.26 stredwic 1467: }
1.73 matthew 1468: return @Data;
1.41 matthew 1469: }
1.26 stredwic 1470:
1.73 matthew 1471: sub compute_all_statistics {
1472: my ($r) = @_;
1473: if (@StatsArray > 0) {
1474: # Assume we have already computed the statistics
1475: return;
1476: }
1477: my $c = $r->connection;
1.97 matthew 1478: foreach my $seq (@sequences) {
1.73 matthew 1479: last if ($c->aborted);
1.82 matthew 1480: &compute_sequence_statistics($seq);
1.73 matthew 1481: &compute_statistics_on_sequence($seq);
1.49 matthew 1482: }
1483: }
1484:
1.73 matthew 1485: sub sort_data {
1486: my ($sortkey) = @_;
1487: return if (! @StatsArray);
1.45 matthew 1488: #
1.73 matthew 1489: # Sort the data
1490: my $sortby = undef;
1.49 matthew 1491: foreach my $field (@Fields) {
1.73 matthew 1492: if ($sortkey eq $field->{'name'}) {
1493: $sortby = $field->{'name'};
1.45 matthew 1494: }
1.26 stredwic 1495: }
1.73 matthew 1496: if (! defined($sortby) || $sortby eq '' || $sortby eq 'problem_num') {
1497: $sortby = 'container';
1498: }
1499: if ($sortby ne 'container') {
1500: # $sortby is already defined, so we can charge ahead
1501: if ($sortby =~ /^(title|part)$/i) {
1502: # Alpha comparison
1503: @StatsArray = sort {
1504: lc($a->{$sortby}) cmp lc($b->{$sortby}) ||
1505: lc($a->{'title'}) cmp lc($b->{'title'}) ||
1506: lc($a->{'part'}) cmp lc($b->{'part'});
1507: } @StatsArray;
1.24 stredwic 1508: } else {
1.73 matthew 1509: # Numerical comparison
1510: @StatsArray = sort {
1511: my $retvalue = 0;
1512: if ($b->{$sortby} eq 'nan') {
1513: if ($a->{$sortby} ne 'nan') {
1514: $retvalue = -1;
1515: } else {
1516: $retvalue = 0;
1517: }
1518: }
1519: if ($a->{$sortby} eq 'nan') {
1520: if ($b->{$sortby} ne 'nan') {
1521: $retvalue = 1;
1522: }
1523: }
1524: if ($retvalue eq '0') {
1525: $retvalue = $b->{$sortby} <=> $a->{$sortby} ||
1526: lc($a->{'title'}) <=> lc($b->{'title'}) ||
1527: lc($a->{'part'}) <=> lc($b->{'part'});
1528: }
1529: $retvalue;
1530: } @StatsArray;
1.24 stredwic 1531: }
1532: }
1.45 matthew 1533: #
1.73 matthew 1534: # Renumber the data set
1535: my $count;
1536: foreach my $data (@StatsArray) {
1537: $data->{'problem_num'} = ++$count;
1538: }
1.24 stredwic 1539: return;
1.48 matthew 1540: }
1541:
1.70 matthew 1542: ########################################################
1543: ########################################################
1544:
1545: =pod
1546:
1547: =item &get_statistics()
1548:
1.117 ! bisitz 1549: Wrapper routine from the call to loncoursedata::get_problem_statistics.
1.73 matthew 1550: Calls lonstathelpers::get_time_limits() to limit the data set by time
1551: and &compute_discrimination_factor
1.70 matthew 1552:
1553: Inputs: $sequence, $resource, $part, $problem_num
1554:
1.117 ! bisitz 1555: Returns: Hash reference with statistics data from
1.70 matthew 1556: loncoursedata::get_problem_statistics.
1557:
1558: =cut
1559:
1560: ########################################################
1561: ########################################################
1.48 matthew 1562: sub get_statistics {
1.49 matthew 1563: my ($sequence,$resource,$part,$problem_num) = @_;
1.48 matthew 1564: #
1.70 matthew 1565: my ($starttime,$endtime) = &Apache::lonstathelpers::get_time_limits();
1.97 matthew 1566: my $symb = $resource->symb;
1.104 albertel 1567: my $courseid = $env{'request.course.id'};
1.48 matthew 1568: #
1.49 matthew 1569: my $data = &Apache::loncoursedata::get_problem_statistics
1.102 matthew 1570: ([&Apache::lonstatistics::get_selected_sections()],
1.108 raeburn 1571: [&Apache::lonstatistics::get_selected_groups()],
1.66 matthew 1572: $Apache::lonstatistics::enrollment_status,
1.70 matthew 1573: $symb,$part,$courseid,$starttime,$endtime);
1.85 matthew 1574: $data->{'symb'} = $symb;
1.49 matthew 1575: $data->{'part'} = $part;
1576: $data->{'problem_num'} = $problem_num;
1.97 matthew 1577: $data->{'container'} = $sequence->compTitle;
1578: $data->{'title'} = $resource->compTitle;
1579: $data->{'title.link'} = $resource->src.'?symb='.
1.109 www 1580: &escape($resource->symb);
1.49 matthew 1581: #
1.76 matthew 1582: if ($SelectedFields{'deg_of_disc'}) {
1.117 ! bisitz 1583: $data->{'deg_of_disc'} =
1.76 matthew 1584: &compute_discrimination_factor($resource,$part,$sequence);
1585: }
1.83 matthew 1586: #
1587: # Store in metadata if computations were done for all students
1.84 matthew 1588: if ($data->{'num_students'} > 1) {
1.102 matthew 1589: my @Sections = &Apache::lonstatistics::get_selected_sections();
1.84 matthew 1590: my $sections = '"'.join(' ',@Sections).'"';
1591: $sections =~ s/&+/_/g; # Ensure no special characters
1592: $data->{'sections'}=$sections;
1.104 albertel 1593: $data->{'course'} = $env{'request.course.id'};
1.97 matthew 1594: my $urlres=(&Apache::lonnet::decode_symb($resource->symb))[2];
1.84 matthew 1595: $data->{'urlres'}=$urlres;
1.117 ! bisitz 1596: my %storestats =
1.84 matthew 1597: &LONCAPA::lonmetadata::dynamic_metadata_storage($data);
1.117 ! bisitz 1598: my ($dom,$user) = ($urlres=~m{^($LONCAPA::domain_re)/($LONCAPA::username_re)});
1.83 matthew 1599: &Apache::lonnet::put('nohist_resevaldata',\%storestats,$dom,$user);
1600: }
1.85 matthew 1601: #
1.95 matthew 1602: $data->{'tries_per_correct'} = $data->{'tries'} /
1603: ($data->{'num_solved'}+0.1);
1604: #
1.85 matthew 1605: # Get the due date for research purposes (commented out most of the time)
1.112 raeburn 1606: # my $duedate = &Apache::lonnet::EXT('resource.'.$part.'.duedate',$symb);;
1607: # my $opendate = &Apache::lonnet::EXT('resource.'.$part.'.opendate',$symb);
1608: # my $maxtries = &Apache::lonnet::EXT('resource.'.$part.'.maxtries',$symb);
1609: # my $hinttries = &Apache::lonnet::EXT('resource.'.$part.'.hinttries',$symb);
1610: my $weight = &Apache::lonnet::EXT('resource.'.$part.'.weight',$symb);
1611: $data->{'weight'} = $weight;
1.117 ! bisitz 1612: # $data->{'duedate'} = $duedate;
1.112 raeburn 1613: # $data->{'opendate'} = $opendate;
1614: # $data->{'maxtries'} = $maxtries;
1615: # $data->{'hinttries'} = $hinttries;
1.86 matthew 1616: # $data->{'resptypes'} = join(',',@{$resource->{'partdata'}->{$part}->{'ResponseTypes'}});
1.49 matthew 1617: return $data;
1.71 matthew 1618: }
1619:
1620: ###############################################
1621: ###############################################
1622:
1623: =pod
1624:
1625: =item &compute_discrimination_factor()
1626:
1627: Inputs: $Resource, $Sequence
1628:
1629: Returns: integer between -1 and 1
1630:
1631: =cut
1632:
1633: ###############################################
1634: ###############################################
1635: sub compute_discrimination_factor {
1.97 matthew 1636: my ($resource,$part,$seq) = @_;
1637: my $symb = $resource->symb;
1.71 matthew 1638: my @Resources;
1.97 matthew 1639: foreach my $res (&Apache::lonstathelpers::get_resources($navmap,$seq)){
1640: next if ($res->symb eq $symb);
1641: push (@Resources,$res->symb);
1.71 matthew 1642: }
1643: #
1644: # rank
1.83 matthew 1645: my ($starttime,$endtime) = &Apache::lonstathelpers::get_time_limits();
1.117 ! bisitz 1646: my $ranking =
1.71 matthew 1647: &Apache::loncoursedata::rank_students_by_scores_on_resources
1648: (\@Resources,
1.102 matthew 1649: [&Apache::lonstatistics::get_selected_sections()],
1.108 raeburn 1650: [&Apache::lonstatistics::get_selected_groups()],
1.83 matthew 1651: $Apache::lonstatistics::enrollment_status,undef,
1.106 bowersj2 1652: $starttime,$endtime, $symb);
1.71 matthew 1653: #
1654: # compute their percent scores on the problems in the sequence,
1655: my $number_to_grab = int(scalar(@{$ranking})/4);
1656: my $num_students = scalar(@{$ranking});
1.117 ! bisitz 1657: my @BottomSet = map { $_->[&Apache::loncoursedata::RNK_student()];
1.71 matthew 1658: } @{$ranking}[0..$number_to_grab];
1.117 ! bisitz 1659: my @TopSet =
! 1660: map {
! 1661: $_->[&Apache::loncoursedata::RNK_student()];
1.106 bowersj2 1662: } @{$ranking}[-$number_to_grab..0];
1.91 matthew 1663: if (! @BottomSet || (@BottomSet == 1 && $BottomSet[0] eq '') ||
1664: ! @TopSet || (@TopSet == 1 && $TopSet[0] eq '')) {
1665: return 'nan';
1666: }
1.117 ! bisitz 1667: my ($bottom_sum,$bottom_max) =
1.97 matthew 1668: &Apache::loncoursedata::get_sum_of_scores($symb,$part,\@BottomSet,
1.83 matthew 1669: undef,$starttime,$endtime);
1.117 ! bisitz 1670: my ($top_sum,$top_max) =
1.97 matthew 1671: &Apache::loncoursedata::get_sum_of_scores($symb,$part,\@TopSet,
1.83 matthew 1672: undef,$starttime,$endtime);
1.71 matthew 1673: my $deg_of_disc;
1674: if ($top_max == 0 || $bottom_max==0) {
1675: $deg_of_disc = 'nan';
1676: } else {
1677: $deg_of_disc = ($top_sum/$top_max) - ($bottom_sum/$bottom_max);
1678: }
1679: #&Apache::lonnet::logthis(' '.$top_sum.'/'.$top_max.
1680: # ' - '.$bottom_sum.'/'.$bottom_max);
1681: return $deg_of_disc;
1.1 stredwic 1682: }
1.12 minaeibi 1683:
1.45 matthew 1684: ###############################################
1685: ###############################################
1.79 matthew 1686: ##
1687: ## Compute KR-21
1688: ##
1689: ## To compute KR-21, you need the following information:
1690: ##
1691: ## K=the number of items in your test
1692: ## M=the mean score on the test
1.117 ! bisitz 1693: ## s=the standard deviation of the scores on your test
1.79 matthew 1694: ##
1695: ## then:
1.117 ! bisitz 1696: ##
1.79 matthew 1697: ## KR-21 rk= [K/(K-1)] * [1- (M*(K-M))/(K*s^2))]
1698: ##
1699: ###############################################
1700: ###############################################
1701: sub compute_sequence_statistics {
1702: my ($seq) = @_;
1.97 matthew 1703: my $symb = $seq->symb;
1.79 matthew 1704: my @Resources;
1.97 matthew 1705: my $part_count;
1706: foreach my $res (&Apache::lonstathelpers::get_resources($navmap,$seq)) {
1707: push (@Resources,$res->symb);
1708: $part_count += scalar(@{$res->parts});
1.79 matthew 1709: }
1710: my ($starttime,$endtime) = &Apache::lonstathelpers::get_time_limits();
1711: #
1712: # First compute statistics based on student scores
1.117 ! bisitz 1713: my ($smin,$smax,$sMean,$sSTD,$scount,$sMAX) =
1.79 matthew 1714: &Apache::loncoursedata::score_stats
1.102 matthew 1715: ([&Apache::lonstatistics::get_selected_sections()],
1.108 raeburn 1716: [&Apache::lonstatistics::get_selected_groups()],
1.79 matthew 1717: $Apache::lonstatistics::enrollment_status,
1718: \@Resources,$starttime,$endtime,undef);
1.97 matthew 1719: $SeqStat{$symb}->{'title'} = $seq->compTitle;
1.79 matthew 1720: $SeqStat{$symb}->{'scoremax'} = $smax;
1721: $SeqStat{$symb}->{'scoremin'} = $smin;
1722: $SeqStat{$symb}->{'scoremean'} = $sMean;
1723: $SeqStat{$symb}->{'scorestd'} = $sSTD;
1724: $SeqStat{$symb}->{'scorecount'} = $scount;
1725: $SeqStat{$symb}->{'max_possible'} = $sMAX;
1726: #
1727: # Compute statistics based on the number of correct problems
1.117 ! bisitz 1728: # 'correct' is taken to mean
1.79 matthew 1729: my ($cmin,$cmax,$cMean,$cSTD,$ccount)=
1730: &Apache::loncoursedata::count_stats
1.102 matthew 1731: ([&Apache::lonstatistics::get_selected_sections()],
1.108 raeburn 1732: [&Apache::lonstatistics::get_selected_groups()],
1.79 matthew 1733: $Apache::lonstatistics::enrollment_status,
1734: \@Resources,$starttime,$endtime,undef);
1.97 matthew 1735: my $K = $part_count;
1.79 matthew 1736: my $kr_21;
1737: if ($K > 1 && $cSTD > 0) {
1738: $kr_21 = ($K/($K-1)) * (1 - $cMean*($K-$cMean)/($K*$cSTD**2));
1739: } else {
1740: $kr_21 = 'nan';
1741: }
1742: $SeqStat{$symb}->{'countmax'} = $cmax;
1743: $SeqStat{$symb}->{'countmin'} = $cmin;
1744: $SeqStat{$symb}->{'countstd'} = $cSTD;
1.82 matthew 1745: $SeqStat{$symb}->{'countmean'} = $cMean;
1.79 matthew 1746: $SeqStat{$symb}->{'count'} = $ccount;
1747: $SeqStat{$symb}->{'items'} = $K;
1748: $SeqStat{$symb}->{'KR-21'}=$kr_21;
1749: return;
1750: }
1751:
1752:
1.47 matthew 1753:
1754: =pod
1755:
1.73 matthew 1756: =item ProblemStatisticsLegend
1757:
1758: =over 4
1759:
1760: =item #Stdnts
1761: Total number of students attempted the problem.
1762:
1763: =item Tries
1764: Total number of tries for solving the problem.
1.59 matthew 1765:
1.73 matthew 1766: =item Max Tries
1767: Largest number of tries for solving the problem by a student.
1768:
1769: =item Mean
1770: Average number of tries. [ Tries / #Stdnts ]
1771:
1772: =item #YES
1773: Number of students solved the problem correctly.
1774:
1775: =item #yes
1776: Number of students solved the problem by override.
1777:
1778: =item %Wrong
1779: Percentage of students who tried to solve the problem
1780: but is still incorrect. [ 100*((#Stdnts-(#YES+#yes))/#Stdnts) ]
1781:
1782: =item DoDiff
1783: Degree of Difficulty of the problem.
1784: [ 1 - ((#YES+#yes) / Tries) ]
1785:
1786: =item S.D.
1787: Standard Deviation of the tries.
1788: [ sqrt(sum((Xi - Mean)^2)) / (#Stdnts-1)
1789: where Xi denotes every student\'s tries ]
1790:
1791: =item Skew.
1792: Skewness of the students tries.
1793: [(sqrt( sum((Xi - Mean)^3) / #Stdnts)) / (S.D.^3)]
1794:
1795: =item Dis.F.
1796: Discrimination Factor: A Standard for evaluating the
1797: problem according to a Criterion<br>
1798:
1799: =item [Criterion to group students into %27 Upper Students -
1800: and %27 Lower Students]
1801: 1st Criterion for Sorting the Students:
1802: Sum of Partial Credit Awarded / Total Number of Tries
1803: 2nd Criterion for Sorting the Students:
1804: Total number of Correct Answers / Total Number of Tries
1805:
1806: =item Disc.
1807: Number of Students had at least one discussion.
1808:
1809: =back
1.47 matthew 1810:
1811: =cut
1.73 matthew 1812:
1813: ############################################################
1814: ############################################################
1.4 minaeibi 1815:
1.1 stredwic 1816: 1;
1817: __END__
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