Annotation of loncom/interface/statistics/lonproblemstatistics.pm, revision 1.119
1.1 stredwic 1: # The LearningOnline Network with CAPA
2: #
1.119 ! www 3: # $Id: lonproblemstatistics.pm,v 1.118 2010/02/28 23:58:54 raeburn 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();
1.119 ! www 55: use Apache::lonquickgrades();
1.1 stredwic 56: use Apache::lonhtmlcommon;
57: use Apache::loncoursedata;
1.41 matthew 58: use Apache::lonstatistics;
1.84 matthew 59: use LONCAPA::lonmetadata();
1.59 matthew 60: use Apache::lonlocal;
1.44 matthew 61: use Spreadsheet::WriteExcel;
1.70 matthew 62: use Apache::lonstathelpers();
1.71 matthew 63: use Time::HiRes;
1.109 www 64: use LONCAPA;
65:
1.73 matthew 66:
67: my @StatsArray;
1.79 matthew 68: my %SeqStat; # keys are symbs, values are hash refs
1.73 matthew 69:
1.59 matthew 70: ##
71: ## Localization notes:
72: ##
73: ## in @Fields[0]->{'long_title'} is placed in Excel files and is used as the
74: ## header for plots created with Graph.pm, both of which more than likely do
75: ## not support localization.
76: ##
1.79 matthew 77: #
78: #
79: ##
80: ## Description of Field attributes
81: ##
82: ## Attribute Required Value Meaning or Use
83: ##
84: ## name yes any scalar Used to uniquely identify field
85: ## title yes any scalar This is what the user sees to identify
86: ## the field. Passed through &mt().
87: ## long_title yes any scalar Used as graph heading and in excel
88: ## output. NOT translated
89: ## align no (left|right|center) HTML cell contents alignment
90: ## color yes html color HTML cell background color
91: ## used to visually group statistics
92: ## special no (link) Indicates a link, target is name.link
93: ## Currently set in &get_statistics()
94: ## graphable no (yes|no) Can a bar graph of the field be
95: ## produced?
96: ## sortable no (yes|no) Should a sort link be put in the
97: ## column header?
98: ## selectable yes (yes|no) Can the column be removed from the
99: ## statistics display?
100: ## selected yes (yes|no) Is the column selected by default?
101: ##
1.85 matthew 102: ## format no sprintf format string
103: ##
104: ## excel_format no excel format type
105: ## (see &Apache::loncommon::define_excel_formats
1.49 matthew 106: my @Fields = (
107: { name => 'problem_num',
108: title => 'P#',
109: align => 'right',
1.76 matthew 110: color => '#FFFFE6',
111: selectable => 'no',
1.80 matthew 112: defaultselected => 'yes',
1.76 matthew 113: },
1.49 matthew 114: { name => 'container',
1.51 matthew 115: title => 'Sequence or Folder',
1.49 matthew 116: align => 'left',
117: color => '#FFFFE6',
1.76 matthew 118: sortable => 'yes',
119: selectable => 'no',
1.80 matthew 120: defaultselected => 'yes',
1.76 matthew 121: },
1.49 matthew 122: { name => 'title',
123: title => 'Title',
124: align => 'left',
125: color => '#FFFFE6',
126: special => 'link',
1.117 bisitz 127: sortable => 'yes',
1.76 matthew 128: selectable => 'no',
1.80 matthew 129: defaultselected => 'yes',
1.76 matthew 130: },
1.117 bisitz 131: { name => 'part',
1.49 matthew 132: title => 'Part',
133: align => 'left',
1.55 matthew 134: color => '#FFFFE6',
1.76 matthew 135: selectable => 'no',
1.80 matthew 136: defaultselected => 'yes',
1.76 matthew 137: },
1.49 matthew 138: { name => 'num_students',
139: title => '#Stdnts',
140: align => 'right',
141: color => '#EEFFCC',
142: format => '%d',
143: sortable => 'yes',
144: graphable => 'yes',
1.76 matthew 145: long_title => 'Number of Students Attempting Problem',
146: selectable => 'yes',
1.80 matthew 147: defaultselected => 'yes',
1.76 matthew 148: },
1.49 matthew 149: { name => 'tries',
150: title => 'Tries',
151: align => 'right',
152: color => '#EEFFCC',
153: format => '%d',
154: sortable => 'yes',
155: graphable => 'yes',
1.76 matthew 156: long_title => 'Total Number of Tries',
157: selectable => 'yes',
1.80 matthew 158: defaultselected => 'yes',
1.76 matthew 159: },
1.49 matthew 160: { name => 'max_tries',
161: title => 'Max Tries',
162: align => 'right',
163: color => '#DDFFFF',
164: format => '%d',
165: sortable => 'yes',
166: graphable => 'yes',
1.76 matthew 167: long_title => 'Maximum Number of Tries',
168: selectable => 'yes',
1.80 matthew 169: defaultselected => 'yes',
1.76 matthew 170: },
1.73 matthew 171: { name => 'min_tries',
172: title => 'Min Tries',
173: align => 'right',
174: color => '#DDFFFF',
175: format => '%d',
176: sortable => 'yes',
177: graphable => 'yes',
1.76 matthew 178: long_title => 'Minumum Number of Tries',
179: selectable => 'yes',
1.80 matthew 180: defaultselected => 'yes',
1.76 matthew 181: },
1.49 matthew 182: { name => 'mean_tries',
183: title => 'Mean Tries',
184: align => 'right',
185: color => '#DDFFFF',
186: format => '%5.2f',
187: sortable => 'yes',
188: graphable => 'yes',
1.76 matthew 189: long_title => 'Average Number of Tries',
190: selectable => 'yes',
1.80 matthew 191: defaultselected => 'yes',
1.76 matthew 192: },
1.49 matthew 193: { name => 'std_tries',
194: title => 'S.D. tries',
195: align => 'right',
196: color => '#DDFFFF',
197: format => '%5.2f',
198: sortable => 'yes',
199: graphable => 'yes',
1.76 matthew 200: long_title => 'Standard Deviation of Number of Tries',
201: selectable => 'yes',
1.80 matthew 202: defaultselected => 'yes',
1.76 matthew 203: },
1.49 matthew 204: { name => 'skew_tries',
205: title => 'Skew Tries',
206: align => 'right',
207: color => '#DDFFFF',
208: format => '%5.2f',
209: sortable => 'yes',
210: graphable => 'yes',
1.76 matthew 211: long_title => 'Skew of Number of Tries',
212: selectable => 'yes',
1.80 matthew 213: defaultselected => 'no',
1.76 matthew 214: },
1.49 matthew 215: { name => 'num_solved',
216: title => '#YES',
217: align => 'right',
218: color => '#FFDDDD',
1.63 matthew 219: format => '%4.1f',# format => '%d',
1.49 matthew 220: sortable => 'yes',
221: graphable => 'yes',
1.76 matthew 222: long_title => 'Number of Students able to Solve',
1.77 matthew 223: selectable => 'yes',
1.80 matthew 224: defaultselected => 'yes',
1.76 matthew 225: },
1.49 matthew 226: { name => 'num_override',
227: title => '#yes',
228: align => 'right',
229: color => '#FFDDDD',
1.63 matthew 230: format => '%4.1f',# format => '%d',
1.49 matthew 231: sortable => 'yes',
232: graphable => 'yes',
1.76 matthew 233: long_title => 'Number of Students given Override',
234: selectable => 'yes',
1.80 matthew 235: defaultselected => 'yes',
1.76 matthew 236: },
1.95 matthew 237: { name => 'tries_per_correct',
238: title => 'tries/correct',
239: align => 'right',
240: color => '#FFDDDD',
241: format => '%4.1f',
242: sortable => 'yes',
243: graphable => 'yes',
244: long_title => 'Tries per Correct Answer',
245: selectable => 'yes',
246: defaultselected => 'yes',
247: },
1.73 matthew 248: { name => 'num_wrong',
249: title => '#Wrng',
1.49 matthew 250: align => 'right',
1.73 matthew 251: color => '#FFDDDD',
1.49 matthew 252: format => '%4.1f',
253: sortable => 'yes',
254: graphable => 'yes',
1.93 matthew 255: long_title => 'Number of students whose final answer is wrong',
256: selectable => 'yes',
257: defaultselected => 'yes',
258: },
259: { name => 'per_wrong',
260: title => '%Wrng',
261: align => 'right',
262: color => '#FFDDDD',
263: format => '%4.1f',
264: sortable => 'yes',
265: graphable => 'yes',
1.76 matthew 266: long_title => 'Percent of students whose final answer is wrong',
267: selectable => 'yes',
1.80 matthew 268: defaultselected => 'yes',
1.76 matthew 269: },
1.73 matthew 270: { name => 'deg_of_diff',
271: title => 'DoDiff',
272: align => 'right',
273: color => '#FFFFE6',
274: format => '%5.2f',
275: sortable => 'yes',
276: graphable => 'yes',
277: long_title => 'Degree of Difficulty'.
1.76 matthew 278: '[ 1 - ((#YES+#yes) / Tries) ]',
279: selectable => 'yes',
1.80 matthew 280: defaultselected => 'yes',
1.76 matthew 281: },
1.71 matthew 282: { name => 'deg_of_disc',
1.73 matthew 283: title => 'DoDisc',
1.71 matthew 284: align => 'right',
285: color => '#FFFFE6',
286: format => '%4.2f',
287: sortable => 'yes',
288: graphable => 'yes',
1.76 matthew 289: long_title => 'Degree of Discrimination',
290: selectable => 'yes',
1.89 matthew 291: defaultselected => 'yes',
1.76 matthew 292: },
1.85 matthew 293: ## duedate included for research purposes. Commented out most of the time.
294: # { name => 'duedate',
295: # title => 'Due Date',
296: # align => 'left',
297: # color => '#FFFFFF',
298: # sortable => 'yes',
299: # graphable => 'no',
300: # long_title => 'Due date of resource for instructor',
301: # selectable => 'no',
302: # defaultselected => 'yes',
303: # },
304: ## opendate included for research purposes. Commented out most of the time.
305: # { name => 'opendate',
306: # title => 'Open Date',
307: # align => 'left',
308: # color => '#FFFFFF',
309: # sortable => 'yes',
310: # graphable => 'no',
311: # long_title => 'date resource became answerable',
312: # selectable => 'no',
313: # defaultselected => 'yes',
314: # },
315: ## symb included for research purposes. Commented out most of the time.
316: # { name => 'symb',
317: # title => 'Symb',
318: # align => 'left',
319: # color => '#FFFFFF',
320: # sortable => 'yes',
321: # graphable => 'no',
322: # long_title => 'Unique LON-CAPA identifier for problem',
323: # selectable => 'no',
324: # defaultselected => 'yes',
325: # },
1.86 matthew 326: ## resptypes included for research purposes. Commented out most of the time.
327: # { name => 'resptypes',
328: # title => 'Response Types',
329: # align => 'left',
330: # color => '#FFFFFF',
331: # sortable => 'no',
332: # graphable => 'no',
333: # long_title => 'Response Types used in this problem',
334: # selectable => 'no',
335: # defaultselected => 'yes',
336: # },
1.94 matthew 337: ## maxtries included for research purposes. Commented out most of the time.
338: # { name => 'maxtries',
339: # title => 'Maxtries',
340: # align => 'left',
341: # color => '#FFFFFF',
342: # sortable => 'no',
343: # graphable => 'no',
344: # long_title => 'Maximum number of tries',
345: # selectable => 'no',
346: # defaultselected => 'yes',
347: # },
348: ## hinttries included for research purposes. Commented out most of the time.
349: # { name => 'hinttries',
350: # title => 'hinttries',
351: # align => 'left',
352: # color => '#FFFFFF',
353: # sortable => 'no',
354: # graphable => 'no',
355: # long_title => 'Number of tries before a hint appears',
356: # selectable => 'no',
357: # defaultselected => 'yes',
358: # },
1.98 matthew 359: #
360: ## problem weight for instructor
361: { name => 'weight',
362: title => 'weight',
363: align => 'right',
364: color => '#FFFFFF',
365: sortable => 'no',
366: graphable => 'no',
367: long_title => 'Problem weight (for instructor)',
1.100 matthew 368: selectable => 'yes',
1.98 matthew 369: defaultselected => 'yes',
370: },
1.49 matthew 371: );
372:
1.79 matthew 373: my @SeqFields = (
374: { name => 'title',
375: title => 'Sequence',
376: align => 'left',
377: color => '#FFFFE6',
378: special => 'no',
1.117 bisitz 379: sortable => 'no',
1.79 matthew 380: selectable => 'yes',
1.80 matthew 381: defaultselected => 'no',
1.79 matthew 382: },
383: { name => 'items',
384: title => '#Items',
385: align => 'right',
386: color => '#FFFFE6',
387: format => '%4d',
388: sortable => 'no',
389: graphable => 'no',
390: long_title => 'Number of Items in Sequence',
391: selectable => 'yes',
1.80 matthew 392: defaultselected => 'no',
1.79 matthew 393: },
394: { name => 'scoremean',
395: title => 'Score Mean',
396: align => 'right',
397: color => '#FFFFE6',
398: format => '%4.2f',
399: sortable => 'no',
400: graphable => 'no',
401: long_title => 'Mean Sequence Score',
402: selectable => 'yes',
1.80 matthew 403: defaultselected => 'no',
1.79 matthew 404: },
405: { name => 'scorestd',
406: title => 'Score STD',
407: align => 'right',
408: color => '#FFFFE6',
409: format => '%4.2f',
410: sortable => 'no',
411: graphable => 'no',
412: long_title => 'Standard Deviation of Sequence Scores',
413: selectable => 'yes',
1.80 matthew 414: defaultselected => 'no',
1.79 matthew 415: },
416: { name => 'scoremax',
417: title => 'Score Max',
418: align => 'right',
419: color => '#FFFFE6',
420: format => '%4.2f',
421: sortable => 'no',
422: graphable => 'no',
423: long_title => 'Maximum Sequence Score',
424: selectable => 'yes',
1.80 matthew 425: defaultselected => 'no',
1.79 matthew 426: },
427: { name => 'scoremin',
428: title => 'Score Min',
429: align => 'right',
430: color => '#FFFFE6',
431: format => '%4.2f',
432: sortable => 'no',
433: graphable => 'no',
434: long_title => 'Minumum Sequence Score',
435: selectable => 'yes',
1.80 matthew 436: defaultselected => 'no',
1.79 matthew 437: },
438: { name => 'scorecount',
439: title => 'Score N',
440: align => 'right',
441: color => '#FFFFE6',
442: format => '%4d',
443: sortable => 'no',
444: graphable => 'no',
445: long_title => 'Number of Students in score computations',
446: selectable => 'yes',
1.80 matthew 447: defaultselected => 'no',
1.79 matthew 448: },
449: { name => 'countmean',
450: title => 'Count Mean',
451: align => 'right',
452: color => '#FFFFFF',
453: format => '%4.2f',
454: sortable => 'no',
455: graphable => 'no',
456: long_title => 'Mean Sequence Score',
457: selectable => 'yes',
1.80 matthew 458: defaultselected => 'no',
1.79 matthew 459: },
460: { name => 'countstd',
461: title => 'Count STD',
462: align => 'right',
463: color => '#FFFFFF',
464: format => '%4.2f',
465: sortable => 'no',
466: graphable => 'no',
467: long_title => 'Standard Deviation of Sequence Scores',
468: selectable => 'yes',
1.80 matthew 469: defaultselected => 'no',
1.79 matthew 470: },
471: { name => 'countmax',
472: title => 'Count Max',
473: align => 'right',
474: color => '#FFFFFF',
475: format => '%4.2f',
476: sortable => 'no',
477: graphable => 'no',
478: long_title => 'Maximum Number of Correct Problems',
479: selectable => 'yes',
1.80 matthew 480: defaultselected => 'no',
1.79 matthew 481: },
482: { name => 'countmin',
483: title => 'Count Min',
484: align => 'right',
485: color => '#FFFFFF',
486: format => '%4.2f',
487: sortable => 'no',
488: graphable => 'no',
489: long_title => 'Minumum Number of Correct Problems',
490: selectable => 'yes',
1.80 matthew 491: defaultselected => 'no',
1.79 matthew 492: },
493: { name => 'count',
494: title => 'Count N',
495: align => 'right',
496: color => '#FFFFFF',
497: format => '%4d',
498: sortable => 'no',
499: graphable => 'no',
500: long_title => 'Number of Students in score computations',
501: selectable => 'yes',
1.80 matthew 502: defaultselected => 'no',
1.79 matthew 503: },
504: { name => 'KR-21',
505: title => 'KR-21',
506: align => 'right',
507: color => '#FFAAAA',
508: format => '%4.2f',
509: sortable => 'no',
510: graphable => 'no',
511: long_title => 'KR-21 reliability statistic',
512: selectable => 'yes',
1.80 matthew 513: defaultselected => 'no',
1.117 bisitz 514: },
1.79 matthew 515: );
516:
1.76 matthew 517: my %SelectedFields;
518:
519: sub parse_field_selection {
520: #
521: # Pull out the defaults
1.104 albertel 522: if (! defined($env{'form.fieldselections'})) {
523: $env{'form.fieldselections'} = [];
1.76 matthew 524: foreach my $field (@Fields) {
525: next if ($field->{'selectable'} ne 'yes');
1.80 matthew 526: if ($field->{'defaultselected'} eq 'yes') {
1.104 albertel 527: push(@{$env{'form.fieldselections'}},$field->{'name'});
1.76 matthew 528: }
529: }
530: }
531: #
1.80 matthew 532: # Make sure the data we are plotting is there
533: my %NeededFields;
1.104 albertel 534: if (exists($env{'form.plot'}) && $env{'form.plot'} ne '' &&
535: $env{'form.plot'} ne 'none') {
536: if ($env{'form.plot'} eq 'degrees') {
1.80 matthew 537: $NeededFields{'deg_of_diff'}++;
538: $NeededFields{'deg_of_disc'}++;
1.104 albertel 539: } elsif ($env{'form.plot'} eq 'tries statistics') {
1.80 matthew 540: $NeededFields{'mean_tries'}++;
541: $NeededFields{'std_tries'}++;
542: $NeededFields{'problem_num'}++;
543: } else {
1.104 albertel 544: $NeededFields{$env{'form.plot'}}++;
1.80 matthew 545: }
546: }
547: #
1.76 matthew 548: # This should not happen, but in case it does...
1.104 albertel 549: if (ref($env{'form.fieldselections'}) ne 'ARRAY') {
550: $env{'form.fieldselections'} = [$env{'form.fieldselections'}];
1.76 matthew 551: }
552: #
553: # Set the field data and the selected fields (for easier checking)
554: undef(%SelectedFields);
555: foreach my $field (@Fields) {
1.80 matthew 556: if ($field->{'selectable'} ne 'yes') {
557: $field->{'selected'} = 'yes';
558: } else {
559: $field->{'selected'} = 'no';
560: }
561: if (exists($NeededFields{$field->{'name'}})) {
562: $field->{'selected'} = 'yes';
563: $SelectedFields{$field->{'name'}}++;
564: }
1.104 albertel 565: foreach my $selection (@{$env{'form.fieldselections'}}) {
1.76 matthew 566: if ($selection eq $field->{'name'} || $selection eq 'all') {
567: $field->{'selected'} = 'yes';
568: $SelectedFields{$field->{'name'}}++;
569: }
570: }
571: }
1.82 matthew 572: #
573: # Always show all the sequence statistics (for now)
574: foreach my $field (@SeqFields) {
575: $field->{'selected'} = 'yes';
576: }
1.76 matthew 577: return;
578: }
579:
580: sub field_selection_input {
1.116 bisitz 581: my $Str = '<select name="fieldselections" multiple="multiple" size="5">'."\n";
1.76 matthew 582: $Str .= '<option value="all">all</option>'."\n";
583: foreach my $field (@Fields) {
584: next if ($field->{'selectable'} ne 'yes');
585: $Str .= ' <option value="'.$field->{'name'}.'" ';
586: if ($field->{'selected'} eq 'yes') {
587: $Str .= 'selected ';
588: }
589: $Str .= '>'.$field->{'title'}.'</option>'."\n";
590: }
591: $Str .= "</select>\n";
592: }
593:
1.47 matthew 594: ###############################################
595: ###############################################
596:
597: =pod
598:
599: =item &CreateInterface()
600:
601: Create the main intereface for the statistics page. Allows the user to
602: select sections, maps, and output.
603:
604: =cut
1.1 stredwic 605:
1.47 matthew 606: ###############################################
607: ###############################################
1.41 matthew 608: sub CreateInterface {
1.87 matthew 609: my ($r) = @_;
1.80 matthew 610: #
1.76 matthew 611: &parse_field_selection();
1.80 matthew 612: #
1.41 matthew 613: my $Str = '';
1.115 bisitz 614: $Str .= '<p>';
615: $Str .= &Apache::loncommon::start_data_table();
616: $Str .= &Apache::loncommon::start_data_table_header_row();
617: $Str .= '<th>'.&mt('Sections').'</th>';
618: $Str .= '<th>'.&mt('Groups').'</th>';
619: $Str .= '<th>'.&mt('Access Status').'</th>';
620: $Str .= '<th>'.&mt('Sequences and Folders').'</th>';
621: $Str .= '<th>'.&mt('Statistics').'</th>';
622: $Str .= '<th>'.&mt('Plot Graph').'</th>';
623: $Str .= '<th>'.&mt('Time Period').'</th>';
624: $Str .= &Apache::loncommon::end_data_table_header_row();
1.41 matthew 625: #
1.115 bisitz 626: $Str .= &Apache::loncommon::start_data_table_row();
627: $Str .= '<td align="center" valign="top">'."\n";
1.41 matthew 628: $Str .= &Apache::lonstatistics::SectionSelect('Section','multiple',5);
1.115 bisitz 629: $Str .= '</td><td align="center" valign="top">';
1.108 raeburn 630: $Str .= &Apache::lonstatistics::GroupSelect('Group','multiple',5);
1.115 bisitz 631: $Str .= '</td><td align="center" valign="top">';
1.50 matthew 632: $Str .= &Apache::lonhtmlcommon::StatusOptions(undef,undef,5);
1.115 bisitz 633: $Str .= '</td><td align="center" valign="top">';
1.41 matthew 634: #
1.97 matthew 635: $Str .= &Apache::lonstatistics::map_select('Maps','multiple,all',5);
1.115 bisitz 636: $Str .= '</td><td align="center" valign="top">';
637: $Str .= &field_selection_input();
638: $Str .= '</td><td align="center" valign="top">';
639: $Str .= &plot_dropdown();
640: $Str .= '</td>'."\n";
641: $Str .= '</td><td align="center" valign="top">';
642: $Str .= &Apache::lonstathelpers::limit_by_time_form();
643: $Str .= '</td>'."\n";
644: $Str .= &Apache::loncommon::end_data_table_row();
645: $Str .= &Apache::loncommon::end_data_table();
1.87 matthew 646: #
1.114 bisitz 647: $Str .= '<p><span class="LC_nobreak">'
648: .&mt('Status: [_1]',
649: '<input type="text" name="stats_status"'
650: .' size="60" value="" readonly="readonly" />')
651: .'</span></p>';
1.87 matthew 652: #
1.115 bisitz 653: $Str .= '</p>';
1.59 matthew 654: $Str .= '<input type="submit" name="GenerateStatistics" value="'.
655: &mt('Generate Statistics').'" />';
1.115 bisitz 656: $Str .= (' 'x10);
1.87 matthew 657: #
1.73 matthew 658: return $Str;
1.41 matthew 659: }
1.25 stredwic 660:
1.41 matthew 661: ###############################################
662: ###############################################
1.28 stredwic 663:
1.47 matthew 664: =pod
665:
666: =item &BuildProblemStatisticsPage()
667:
668: Main interface to problem statistics.
669:
670: =cut
671:
1.41 matthew 672: ###############################################
673: ###############################################
1.97 matthew 674: my $navmap;
675: my @sequences;
676:
1.105 albertel 677: sub clean_up {
678: undef($navmap);
679: undef(@sequences);
680: }
681:
1.41 matthew 682: sub BuildProblemStatisticsPage {
683: my ($r,$c)=@_;
1.97 matthew 684: undef($navmap);
685: undef(@sequences);
1.61 matthew 686: #
687: my %Saveable_Parameters = ('Status' => 'scalar',
688: 'statsoutputmode' => 'scalar',
689: 'Section' => 'array',
1.108 raeburn 690: 'Groups' => 'array',
1.61 matthew 691: 'StudentData' => 'array',
1.77 matthew 692: 'Maps' => 'array',
693: 'fieldselections'=> 'array');
1.61 matthew 694: &Apache::loncommon::store_course_settings('statistics',
695: \%Saveable_Parameters);
696: &Apache::loncommon::restore_course_settings('statistics',
697: \%Saveable_Parameters);
698: #
699: &Apache::lonstatistics::PrepareClasslist();
1.41 matthew 700: #
1.73 matthew 701: # Clear the package variables
702: undef(@StatsArray);
1.79 matthew 703: undef(%SeqStat);
1.71 matthew 704: #
1.73 matthew 705: # Finally let the user know we are here
1.119 ! www 706: $r->print(&Apache::lonhtmlcommon::breadcrumbs('Overall Problem Statistics',
! 707: 'Statistics_Overall_Key'));
! 708: &Apache::lonquickgrades::startGradeScreen($r,'statistics');
! 709:
1.87 matthew 710: my $interface = &CreateInterface($r);
1.57 matthew 711: $r->print($interface);
1.104 albertel 712: $r->print('<input type="hidden" name="sortby" value="'.$env{'form.sortby'}.
1.41 matthew 713: '" />');
1.73 matthew 714: #
1.117 bisitz 715: my @CacheButtonHTML =
1.87 matthew 716: &Apache::lonstathelpers::manage_caches($r,'Statistics','stats_status');
717: my $Str;
718: foreach my $html (@CacheButtonHTML) {
719: $Str.=$html.(' 'x5);
720: }
721: #
722: $r->print($Str);
1.104 albertel 723: if (! exists($env{'form.firstrun'})) {
1.117 bisitz 724: $r->print('<p class="LC_info"><b>'.
1.73 matthew 725: &mt('Press "Generate Statistics" when you are ready.').
1.117 bisitz 726: '</b></p>'.
727: '<p class="LC_info">'.
1.73 matthew 728: &mt('It may take some time to update the student data '.
1.117 bisitz 729: 'for the first analysis. Future analysis this session '.
1.113 bisitz 730: 'will not have this delay.').
1.73 matthew 731: '</p>');
1.105 albertel 732: &clean_up();
1.41 matthew 733: return;
1.28 stredwic 734: }
1.73 matthew 735: $r->rflush();
1.41 matthew 736: #
1.73 matthew 737: # This probably does not need to be done each time we are called, but
738: # it does not slow things down noticably.
739: &Apache::loncoursedata::populate_weight_table();
1.75 matthew 740: #
1.117 bisitz 741: ($navmap,@sequences) =
1.99 matthew 742: &Apache::lonstatistics::selected_sequences_with_assessments();
743: if (! ref($navmap)) {
1.115 bisitz 744: $r->print('<div class="LC_error">'.&mt('A course-wide error occurred.').'</div>'.
1.99 matthew 745: '<h3>'.$navmap.'</h3>');
1.105 albertel 746: &clean_up();
1.99 matthew 747: return;
748: }
1.104 albertel 749: if (exists($env{'form.Excel'})) {
1.102 matthew 750: $r->print('<h4>'.
751: &Apache::lonstatistics::section_and_enrollment_description().
752: '</h4>');
1.73 matthew 753: &Excel_output($r);
1.117 bisitz 754: } else {
1.87 matthew 755: $r->print('<input type="submit" name="Excel" value="'.
756: &mt('Produce Excel Output').'" />'.' 'x5);
757: $r->rflush();
1.102 matthew 758: $r->print('<h4>'.
759: &Apache::lonstatistics::section_and_enrollment_description().
760: '</h4>');
1.75 matthew 761: my $count = 0;
1.97 matthew 762: foreach my $seq (@sequences) {
1.117 bisitz 763: my @resources =
1.97 matthew 764: &Apache::lonstathelpers::get_resources($navmap,$seq);
765: $count += scalar(@resources);
1.75 matthew 766: }
767: if ($count > 10) {
768: $r->print('<h2>'.
769: &mt('Compiling statistics for [_1] problems',$count).
770: '</h2>');
771: if ($count > 30) {
772: $r->print('<h3>'.&mt('This will take some time.').'</h3>');
773: }
774: $r->rflush();
775: }
776: #
1.104 albertel 777: my $sortby = $env{'form.sortby'};
1.73 matthew 778: $sortby = 'container' if (! defined($sortby) || $sortby =~ /^\s*$/);
1.104 albertel 779: my $plot = $env{'form.plot'};
1.75 matthew 780: if ($plot eq '' || $plot eq 'none') {
781: undef($plot);
782: }
1.73 matthew 783: if ($sortby eq 'container' && ! defined($plot)) {
1.79 matthew 784: &output_sequence_statistics($r);
1.73 matthew 785: &output_html_by_sequence($r);
786: } else {
787: if (defined($plot)) {
788: &make_plot($r,$plot);
789: }
790: &output_html_stats($r);
1.79 matthew 791: &output_sequence_statistics($r);
1.73 matthew 792: }
793: }
1.105 albertel 794: &clean_up();
1.73 matthew 795: return;
796: }
797:
1.79 matthew 798: sub output_sequence_statistics {
799: my ($r) = @_;
800: my $c=$r->connection();
1.90 matthew 801: $r->print('<h2>'.&mt('Sequence Statistics').
802: &Apache::loncommon::help_open_topic('Statistics_Sequence').
803: '</h2>');
1.79 matthew 804: $r->print('<table border="0"><tr><td bgcolor="#777777">'."\n".
805: '<table border="0" cellpadding="3">'."\n".
806: '<tr bgcolor="#FFFFE6">');
807: $r->print(&sequence_html_header());
1.117 bisitz 808: foreach my $seq (@sequences) {
1.79 matthew 809: last if ($c->aborted);
810: &compute_sequence_statistics($seq);
811: $r->print(&sequence_html_output($seq));
812: }
813: $r->print('</table>');
814: $r->print('</table>');
815: $r->rflush();
816: return;
817: }
818:
819:
1.73 matthew 820: ##########################################################
821: ##########################################################
822: ##
823: ## HTML output routines
824: ##
825: ##########################################################
826: ##########################################################
827: sub output_html_by_sequence {
828: my ($r) = @_;
829: my $c = $r->connection();
830: $r->print(&html_preamble());
1.41 matthew 831: #
1.97 matthew 832: foreach my $seq (@sequences) {
1.73 matthew 833: last if ($c->aborted);
1.97 matthew 834: $r->print("<h3>".$seq->compTitle."</h3>".
1.73 matthew 835: '<table border="0"><tr><td bgcolor="#777777">'."\n".
836: '<table border="0" cellpadding="3">'."\n".
837: '<tr bgcolor="#FFFFE6">'.
838: &statistics_table_header('no container')."</tr>\n");
839: my @Data = &compute_statistics_on_sequence($seq);
840: foreach my $data (@Data) {
841: $r->print('<tr>'.&statistics_html_table_data($data,
842: 'no container').
843: "</tr>\n");
1.70 matthew 844: }
1.73 matthew 845: $r->print('</table>'."\n".'</table>'."\n");
1.41 matthew 846: $r->rflush();
1.28 stredwic 847: }
1.41 matthew 848: return;
849: }
1.21 stredwic 850:
1.73 matthew 851: sub output_html_stats {
852: my ($r)=@_;
853: &compute_all_statistics($r);
854: $r->print(&html_preamble());
1.104 albertel 855: &sort_data($env{'form.sortby'});
1.73 matthew 856: #
857: my $count=0;
858: foreach my $data (@StatsArray) {
859: if ($count++ % 50 == 0) {
860: $r->print("</table>\n</table>\n");
861: $r->print('<table border="0"><tr><td bgcolor="#777777">'."\n".
862: '<table border="0" cellpadding="3">'."\n".
863: '<tr bgcolor="#FFFFE6">'.
864: '<tr bgcolor="#FFFFE6">'.
865: &statistics_table_header().
866: "</tr>\n");
867: }
868: $r->print('<tr>'.&statistics_html_table_data($data)."</tr>\n");
869: }
870: $r->print("</table>\n</table>\n");
871: return;
872: }
1.47 matthew 873:
1.73 matthew 874: sub html_preamble {
875: my $Str='';
876: $Str .= "<h2>".
1.104 albertel 877: $env{'course.'.$env{'request.course.id'}.'.description'}.
1.73 matthew 878: "</h2>\n";
879: my ($starttime,$endtime) = &Apache::lonstathelpers::get_time_limits();
880: if (defined($starttime) || defined($endtime)) {
881: # Inform the user what the time limits on the data are.
882: $Str .= '<h3>'.&mt('Statistics on submissions from [_1] to [_2]',
883: &Apache::lonlocal::locallocaltime($starttime),
884: &Apache::lonlocal::locallocaltime($endtime)
885: ).'</h3>';
886: }
887: $Str .= "<h3>".&mt('Compiled on [_1]',
888: &Apache::lonlocal::locallocaltime(time))."</h3>";
889: return $Str;
890: }
1.47 matthew 891:
892:
1.44 matthew 893: ###############################################
894: ###############################################
1.73 matthew 895: ##
896: ## Misc HTML output routines
897: ##
898: ###############################################
899: ###############################################
900: sub statistics_html_table_data {
901: my ($data,$options) = @_;
902: my $row = '';
903: foreach my $field (@Fields) {
904: next if ($options =~ /no $field->{'name'}/);
1.76 matthew 905: next if ($field->{'selected'} ne 'yes');
1.73 matthew 906: $row .= '<td bgcolor="'.$field->{'color'}.'"';
907: if (exists($field->{'align'})) {
908: $row .= ' align="'.$field->{'align'}.'"';
1.41 matthew 909: }
1.73 matthew 910: $row .= '>';
911: if (exists($field->{'special'}) && $field->{'special'} eq 'link') {
912: $row .= '<a href="'.$data->{$field->{'name'}.'.link'}.'">';
1.41 matthew 913: }
1.92 matthew 914: if (exists($field->{'format'}) && $data->{$field->{'name'}} !~ /[A-Z]/i) {
1.73 matthew 915: $row .= sprintf($field->{'format'},$data->{$field->{'name'}});
916: } else {
917: $row .= $data->{$field->{'name'}};
918: }
919: if (exists($field->{'special'}) && $field->{'special'} eq 'link') {
920: $row.= '</a>';
921: }
922: $row .= '</td>';
1.21 stredwic 923: }
1.73 matthew 924: return $row;
1.41 matthew 925: }
1.25 stredwic 926:
1.73 matthew 927: sub statistics_table_header {
928: my ($options) = @_;
929: my $header_row;
930: foreach my $field (@Fields) {
931: next if ($options =~ /no $field->{'name'}/);
1.76 matthew 932: next if ($field->{'selected'} ne 'yes');
1.73 matthew 933: $header_row .= '<th>';
934: if (exists($field->{'sortable'}) && $field->{'sortable'} eq 'yes') {
935: $header_row .= '<a href="javascript:'.
936: 'document.Statistics.sortby.value='."'".$field->{'name'}."'".
937: ';document.Statistics.submit();">';
938: }
939: $header_row .= &mt($field->{'title'});
940: if ($options =~ /sortable/) {
941: $header_row.= '</a>';
942: }
943: if ($options !~ /no plots/ &&
944: exists($field->{'graphable'}) &&
945: $field->{'graphable'} eq 'yes') {
946: $header_row.=' (';
947: $header_row .= '<a href="javascript:'.
948: "document.Statistics.plot.value='$field->{'name'}'".
949: ';document.Statistics.submit();">';
950: $header_row .= &mt('plot').'</a>)';
951: }
952: $header_row .= '</th>';
953: }
954: return $header_row;
955: }
1.26 stredwic 956:
1.79 matthew 957: sub sequence_html_header {
958: my $Str .= '<tr>';
959: foreach my $field (@SeqFields) {
960: # next if ($field->{'selected'} ne 'yes');
961: $Str .= '<th bgcolor="'.$field->{'color'}.'"';
962: $Str .= '>'.$field->{'title'}.'</th>';
963: }
964: $Str .= '</tr>';
965: return $Str;
966: }
967:
968:
969: sub sequence_html_output {
970: my ($seq) = @_;
1.97 matthew 971: my $data = $SeqStat{$seq->symb};
1.79 matthew 972: my $row = '<tr>';
973: foreach my $field (@SeqFields) {
1.82 matthew 974: next if ($field->{'selected'} ne 'yes');
1.79 matthew 975: $row .= '<td bgcolor="'.$field->{'color'}.'"';
976: if (exists($field->{'align'})) {
977: $row .= ' align="'.$field->{'align'}.'"';
978: }
979: $row .= '>';
980: if (exists($field->{'format'})) {
981: $row .= sprintf($field->{'format'},$data->{$field->{'name'}});
982: } else {
983: $row .= $data->{$field->{'name'}};
984: }
985: $row .= '</td>';
986: }
987: $row .= '</tr>'."\n";
988: return $row;
989: }
990:
1.73 matthew 991: ####################################################
992: ####################################################
993: ##
994: ## Plotting Routines
995: ##
996: ####################################################
997: ####################################################
998: sub make_plot {
999: my ($r,$plot) = @_;
1000: &compute_all_statistics($r);
1.104 albertel 1001: &sort_data($env{'form.sortby'});
1.73 matthew 1002: if ($plot eq 'degrees') {
1003: °rees_plot($r);
1.74 matthew 1004: } elsif ($plot eq 'tries statistics') {
1005: &tries_data_plot($r);
1.73 matthew 1006: } else {
1007: &make_single_stat_plot($r,$plot);
1008: }
1009: return;
1010: }
1.47 matthew 1011:
1.73 matthew 1012: sub make_single_stat_plot {
1013: my ($r,$datafield) = @_;
1.41 matthew 1014: #
1.73 matthew 1015: my $title; my $yaxis;
1016: foreach my $field (@Fields) {
1017: next if ($field->{'name'} ne $datafield);
1018: $title = $field->{'long_title'};
1019: $yaxis = $field->{'title'};
1020: last;
1021: }
1022: if ($title eq '' || $yaxis eq '') {
1023: # datafield is something we do not know enough about to plot
1024: $r->print('<h3>'.
1025: &mt('Unable to plot the requested statistic.').
1026: '</h3>');
1027: return;
1.49 matthew 1028: }
1029: #
1.73 matthew 1030: # Build up the data sets to plot
1.117 bisitz 1031: my @Labels;
1.73 matthew 1032: my @Data;
1033: my $max = 1;
1034: foreach my $data (@StatsArray) {
1035: push(@Labels,$data->{'problem_num'});
1036: push(@Data,$data->{$datafield});
1037: if ($data->{$datafield}>$max) {
1038: $max = $data->{$datafield};
1039: }
1040: }
1041: foreach (1,2,3,4,5,10,15,20,25,40,50,75,100,150,200,250,300,500,600,750,
1042: 1000,1500,2000,2500,3000,3500,4000,5000,7500,10000,15000,20000) {
1043: if ($max <= $_) {
1044: $max = $_;
1045: last;
1.42 matthew 1046: }
1047: }
1.73 matthew 1048: if ($max > 20000) {
1049: $max = 10000*(int($max/10000)+1);
1.42 matthew 1050: }
1.73 matthew 1051: #
1052: $r->print("<p>".&Apache::loncommon::DrawBarGraph($title,
1053: 'Problem Number',
1054: $yaxis,
1055: $max,
1056: undef, # colors
1057: \@Labels,
1058: \@Data)."</p>\n");
1059: return;
1060: }
1061:
1062: sub degrees_plot {
1063: my ($r)=@_;
1064: my $count = scalar(@StatsArray);
1065: my $width = 50 + 10*$count;
1066: $width = 300 if ($width < 300);
1067: my $height = 300;
1068: my $plot = '';
1069: my $ymax = 0;
1070: my $ymin = 0;
1.117 bisitz 1071: my @Disc; my @Diff; my @Labels;
1.73 matthew 1072: foreach my $data (@StatsArray) {
1073: push(@Labels,$data->{'problem_num'});
1074: my $disc = $data->{'deg_of_disc'};
1075: my $diff = $data->{'deg_of_diff'};
1076: push(@Disc,$disc);
1077: push(@Diff,$diff);
1078: #
1079: $ymin = $disc if ($ymin > $disc);
1080: $ymin = $diff if ($ymin > $diff);
1081: $ymax = $disc if ($ymax < $disc);
1082: $ymax = $diff if ($ymax < $diff);
1083: }
1084: #
1085: # Make sure we show relevant information.
1086: if ($ymin < 0) {
1087: if (abs($ymin) < 0.05) {
1088: $ymin = 0;
1089: } else {
1090: $ymin = -1;
1.42 matthew 1091: }
1092: }
1.73 matthew 1093: if ($ymax > 0) {
1094: if (abs($ymax) < 0.05) {
1095: $ymax = 0;
1.42 matthew 1096: } else {
1.73 matthew 1097: $ymax = 1;
1.42 matthew 1098: }
1.43 matthew 1099: }
1.49 matthew 1100: #
1.73 matthew 1101: my $xmax = $Labels[-1];
1102: if ($xmax > 50) {
1103: if ($xmax % 10 != 0) {
1104: $xmax = 10 * (int($xmax/10)+1);
1105: }
1106: } else {
1107: if ($xmax % 5 != 0) {
1108: $xmax = 5 * (int($xmax/5)+1);
1.49 matthew 1109: }
1.26 stredwic 1110: }
1.41 matthew 1111: #
1.73 matthew 1112: my $discdata .= '<data>'.join(',',@Labels).'</data>'.$/.
1113: '<data>'.join(',',@Disc).'</data>'.$/;
1114: #
1115: my $diffdata .= '<data>'.join(',',@Labels).'</data>'.$/.
1116: '<data>'.join(',',@Diff).'</data>'.$/;
1117: #
1.81 matthew 1118: my $title = 'Degree of Discrimination\nand Degree of Difficulty';
1119: if ($xmax > 50) {
1120: $title = 'Degree of Discrimination and Degree of Difficulty';
1121: }
1122: #
1.73 matthew 1123: $plot=<<"END";
1124: <gnuplot
1125: texfont="10"
1126: fgcolor="x000000"
1127: plottype="Cartesian"
1128: font="large"
1129: grid="on"
1130: align="center"
1131: border="on"
1132: transparent="on"
1.81 matthew 1133: alttag="Degree of Discrimination and Degree of Difficulty Plot"
1.73 matthew 1134: samples="100"
1135: bgcolor="xffffff"
1136: height="$height"
1137: width="$width">
1138: <key
1139: pos="top right"
1140: title=""
1141: box="off" />
1.81 matthew 1142: <title>$title</title>
1.73 matthew 1143: <axis xmin="0" ymin="$ymin" xmax="$xmax" ymax="$ymax" color="x000000" />
1144: <xlabel>Problem Number</xlabel>
1145: <curve
1146: linestyle="linespoints"
1147: name="DoDisc"
1148: pointtype="0"
1149: color="x000000">
1150: $discdata
1151: </curve>
1152: <curve
1153: linestyle="linespoints"
1154: name="DoDiff"
1155: pointtype="0"
1156: color="xFF0000">
1157: $diffdata
1158: </curve>
1159: </gnuplot>
1160: END
1.117 bisitz 1161: my $plotresult =
1.73 matthew 1162: '<p>'.&Apache::lonxml::xmlparse($r,'web',$plot).'</p>'.$/;
1163: $r->print($plotresult);
1.41 matthew 1164: return;
1.42 matthew 1165: }
1166:
1.74 matthew 1167: sub tries_data_plot {
1168: my ($r)=@_;
1169: my $count = scalar(@StatsArray);
1170: my $width = 50 + 10*$count;
1171: $width = 300 if ($width < 300);
1172: my $height = 300;
1173: my $plot = '';
1174: my @STD; my @Mean; my @Max; my @Min;
1175: my @Labels;
1176: my $ymax = 5;
1177: foreach my $data (@StatsArray) {
1178: my $max = $data->{'mean_tries'} + $data->{'std_tries'};
1179: $ymax = $max if ($ymax < $max);
1180: $ymax = $max if ($ymax < $max);
1181: push(@Labels,$data->{'problem_num'});
1182: push(@STD,$data->{'std_tries'});
1183: push(@Mean,$data->{'mean_tries'});
1184: }
1185: #
1186: # Make sure we show relevant information.
1187: my $xmax = $Labels[-1];
1188: if ($xmax > 50) {
1189: if ($xmax % 10 != 0) {
1190: $xmax = 10 * (int($xmax/10)+1);
1191: }
1192: } else {
1193: if ($xmax % 5 != 0) {
1194: $xmax = 5 * (int($xmax/5)+1);
1195: }
1196: }
1197: $ymax = int($ymax)+1+2;
1198: #
1199: my $std_data .= '<data>'.join(',',@Labels).'</data>'.$/.
1200: '<data>'.join(',',@Mean).'</data>'.$/;
1201: #
1202: my $std_error_data .= '<data>'.join(',',@Labels).'</data>'.$/.
1203: '<data>'.join(',',@Mean).'</data>'.$/.
1204: '<data>'.join(',',@STD).'</data>'.$/;
1205: #
1.81 matthew 1206: my $title = 'Mean and S.D. of Tries';
1207: if ($xmax > 25) {
1208: $title = 'Mean and Standard Deviation of Tries';
1209: }
1210: #
1.74 matthew 1211: $plot=<<"END";
1212: <gnuplot
1213: texfont="10"
1214: fgcolor="x000000"
1215: plottype="Cartesian"
1216: font="large"
1217: grid="on"
1218: align="center"
1219: border="on"
1220: transparent="on"
1.81 matthew 1221: alttag="Mean and S.D of Tries Plot"
1.74 matthew 1222: samples="100"
1223: bgcolor="xffffff"
1224: height="$height"
1225: width="$width">
1.81 matthew 1226: <title>$title</title>
1.74 matthew 1227: <axis xmin="0" ymin="0" xmax="$xmax" ymax="$ymax" color="x000000" />
1228: <xlabel>Problem Number</xlabel>
1.81 matthew 1229: <ylabel>Number of Tries</ylabel>
1.74 matthew 1230: <curve
1231: linestyle="yerrorbars"
1232: name="S.D. Tries"
1233: pointtype="1"
1234: color="x666666">
1235: $std_error_data
1236: </curve>
1237: <curve
1238: linestyle="points"
1239: name="Mean Tries"
1240: pointtype="1"
1241: color="xCC4444">
1242: $std_data
1243: </curve>
1244: </gnuplot>
1245: END
1.117 bisitz 1246: my $plotresult =
1.74 matthew 1247: '<p>'.&Apache::lonxml::xmlparse($r,'web',$plot).'</p>'.$/;
1248: $r->print($plotresult);
1249: return;
1250: }
1251:
1.73 matthew 1252: sub plot_dropdown {
1253: my $current = '';
1254: #
1.104 albertel 1255: if (defined($env{'form.plot'})) {
1256: $current = $env{'form.plot'};
1.73 matthew 1257: }
1258: #
1259: my @Additional_Plots = (
1260: { graphable=>'yes',
1261: name => 'degrees',
1.81 matthew 1262: title => 'Difficulty Indexes' },
1.74 matthew 1263: { graphable=>'yes',
1264: name => 'tries statistics',
1.81 matthew 1265: title => 'Tries Statistics' });
1.73 matthew 1266: #
1267: my $Str= "\n".'<select name="plot" size="1">';
1268: $Str .= '<option name="none"></option>'."\n";
1269: $Str .= '<option name="none2">none</option>'."\n";
1.81 matthew 1270: foreach my $field (@Additional_Plots,@Fields) {
1.73 matthew 1271: if (! exists($field->{'graphable'}) ||
1272: $field->{'graphable'} ne 'yes') {
1273: next;
1274: }
1275: $Str .= '<option value="'.$field->{'name'}.'"';
1276: if ($field->{'name'} eq $current) {
1277: $Str .= ' selected ';
1278: }
1279: $Str.= '>'.&mt($field->{'title'}).'</option>'."\n";
1280: }
1281: $Str .= '</select>'."\n";
1282: return $Str;
1283: }
1284:
1.41 matthew 1285: ###############################################
1286: ###############################################
1.73 matthew 1287: ##
1288: ## Excel output routines
1289: ##
1.41 matthew 1290: ###############################################
1291: ###############################################
1.73 matthew 1292: sub Excel_output {
1.44 matthew 1293: my ($r) = @_;
1.73 matthew 1294: $r->print('<h2>'.&mt('Preparing Excel Spreadsheet').'</h2>');
1295: ##
1296: ## Compute the statistics
1297: &compute_all_statistics($r);
1298: my $c = $r->connection;
1299: return if ($c->aborted());
1.101 matthew 1300: #
1301: my ($starttime,$endtime) = &Apache::lonstathelpers::get_time_limits();
1.73 matthew 1302: ##
1303: ## Create the excel workbook
1.101 matthew 1304: my ($excel_workbook,$filename,$format) =
1305: &Apache::loncommon::create_workbook($r);
1306: return if (! defined($excel_workbook));
1.44 matthew 1307: #
1308: # Add a worksheet
1.104 albertel 1309: my $sheetname = $env{'course.'.$env{'request.course.id'}.'.description'};
1.44 matthew 1310: if (length($sheetname) > 31) {
1311: $sheetname = substr($sheetname,0,31);
1312: }
1.73 matthew 1313: my $excel_sheet = $excel_workbook->addworksheet(
1314: &Apache::loncommon::clean_excel_name($sheetname));
1315: ##
1316: ## Begin creating excel sheet
1317: ##
1318: my ($rows_output,$cols_output) = (0,0);
1.44 matthew 1319: #
1320: # Put the course description in the header
1321: $excel_sheet->write($rows_output,$cols_output++,
1.104 albertel 1322: $env{'course.'.$env{'request.course.id'}.'.description'},
1.82 matthew 1323: $format->{'h1'});
1.44 matthew 1324: $cols_output += 3;
1325: #
1326: # Put a description of the sections listed
1327: my $sectionstring = '';
1.82 matthew 1328: $excel_sheet->write($rows_output,$cols_output++,
1.103 matthew 1329: &Apache::lonstatistics::section_and_enrollment_description('plaintext'),
1.82 matthew 1330: $format->{'h3'});
1.102 matthew 1331: $cols_output += scalar(&Apache::lonstatistics::get_selected_sections());
1.108 raeburn 1332: $cols_output += scalar(&Apache::lonstatistics::get_selected_groups());
1.44 matthew 1333: #
1.70 matthew 1334: # Time restrictions
1335: my $time_string;
1336: if (defined($starttime)) {
1337: # call localtime but not lonlocal:locallocaltime because excel probably
1338: # cannot handle localized text. Probably.
1339: $time_string .= 'Data collected from '.localtime($time_string);
1340: if (defined($endtime)) {
1341: $time_string .= ' to '.localtime($endtime);
1342: }
1343: $time_string .= '.';
1344: } elsif (defined($endtime)) {
1345: # See note above about lonlocal:locallocaltime
1346: $time_string .= 'Data collected before '.localtime($endtime).'.';
1347: }
1.82 matthew 1348: if (defined($time_string)) {
1349: $excel_sheet->write($rows_output,$cols_output++,$time_string);
1350: $cols_output+= 5;
1351: }
1.70 matthew 1352: #
1.44 matthew 1353: # Put the date in there too
1354: $excel_sheet->write($rows_output,$cols_output++,
1355: 'Compiled on '.localtime(time));
1356: #
1.117 bisitz 1357: $rows_output++;
1.44 matthew 1358: $cols_output=0;
1.82 matthew 1359: ##
1360: ## Sequence Statistics
1.117 bisitz 1361: ##
1.82 matthew 1362: &write_headers($excel_sheet,$format,\$rows_output,\$cols_output,
1363: \@SeqFields);
1.97 matthew 1364: foreach my $seq (@sequences) {
1365: my $data = $SeqStat{$seq->symb};
1.82 matthew 1366: $cols_output=0;
1367: foreach my $field (@SeqFields) {
1368: next if ($field->{'selected'} ne 'yes');
1.85 matthew 1369: my $fieldformat = undef;
1370: if (exists($field->{'excel_format'})) {
1371: $fieldformat = $format->{$field->{'excel_format'}};
1372: }
1.55 matthew 1373: $excel_sheet->write($rows_output,$cols_output++,
1.85 matthew 1374: $data->{$field->{'name'}},$fieldformat);
1.55 matthew 1375: }
1.82 matthew 1376: $rows_output++;
1377: $cols_output=0;
1.55 matthew 1378: }
1.82 matthew 1379: ##
1380: ## Resource Statistics
1381: ##
1.55 matthew 1382: $rows_output++;
1383: $cols_output=0;
1.82 matthew 1384: &write_headers($excel_sheet,$format,\$rows_output,\$cols_output,
1385: \@Fields);
1386: #
1.73 matthew 1387: foreach my $data (@StatsArray) {
1388: $cols_output=0;
1389: foreach my $field (@Fields) {
1.76 matthew 1390: next if ($field->{'selected'} ne 'yes');
1.73 matthew 1391: next if ($field->{'name'} eq 'problem_num');
1.85 matthew 1392: my $fieldformat = undef;
1393: if (exists($field->{'excel_format'})) {
1394: $fieldformat = $format->{$field->{'excel_format'}};
1395: }
1.73 matthew 1396: $excel_sheet->write($rows_output,$cols_output++,
1.85 matthew 1397: $data->{$field->{'name'}},$fieldformat);
1.44 matthew 1398: }
1.73 matthew 1399: $rows_output++;
1.82 matthew 1400: $cols_output=0;
1.44 matthew 1401: }
1402: #
1403: $excel_workbook->close();
1.73 matthew 1404: #
1.44 matthew 1405: # Tell the user where to get their excel file
1406: $r->print('<br />'.
1.59 matthew 1407: '<a href="'.$filename.'">'.
1408: &mt('Your Excel Spreadsheet').'</a>'."\n");
1.44 matthew 1409: $r->rflush();
1410: return;
1411: }
1412:
1.82 matthew 1413: ##
1414: ## &write_headers
1415: ##
1416: sub write_headers {
1417: my ($excel_sheet,$format,$rows_output,$cols_output,$Fields) = @_;
1418: ##
1419: ## First the long titles
1420: foreach my $field (@{$Fields}) {
1421: next if ($field->{'name'} eq 'problem_num');
1422: next if ($field->{'selected'} ne 'yes');
1423: if (exists($field->{'long_title'})) {
1424: $excel_sheet->write($$rows_output,${$cols_output},
1425: $field->{'long_title'},
1426: $format->{'bold'});
1427: } else {
1428: $excel_sheet->write($$rows_output,${$cols_output},'');
1429: }
1430: ${$cols_output}+= 1;
1431: }
1432: ${$cols_output} =0;
1433: ${$rows_output}+=1;
1434: ##
1435: ## Then the short titles
1436: foreach my $field (@{$Fields}) {
1437: next if ($field->{'selected'} ne 'yes');
1438: next if ($field->{'name'} eq 'problem_num');
1.117 bisitz 1439: # Use english for excel as I am not sure how well excel handles
1.82 matthew 1440: # other character sets....
1441: $excel_sheet->write($$rows_output,$$cols_output,
1442: $field->{'title'},
1443: $format->{'bold'});
1444: $$cols_output+=1;
1445: }
1446: ${$cols_output} =0;
1447: ${$rows_output}+=1;
1448: return;
1449: }
1450:
1.73 matthew 1451: ##################################################
1452: ##################################################
1453: ##
1454: ## Statistics Gathering and Manipulation Routines
1455: ##
1456: ##################################################
1457: ##################################################
1458: sub compute_statistics_on_sequence {
1459: my ($seq) = @_;
1460: my @Data;
1.97 matthew 1461: foreach my $res (&Apache::lonstathelpers::get_resources($navmap,$seq)) {
1462: foreach my $part (@{$res->parts}) {
1.118 raeburn 1463: next if (($res->is_survey($part)) || ($res->is_anonsurvey($part))) ;
1.73 matthew 1464: #
1465: # This is where all the work happens
1466: my $data = &get_statistics($seq,$res,$part,scalar(@StatsArray)+1);
1467: push (@Data,$data);
1468: push (@StatsArray,$data);
1.49 matthew 1469: }
1.26 stredwic 1470: }
1.73 matthew 1471: return @Data;
1.41 matthew 1472: }
1.26 stredwic 1473:
1.73 matthew 1474: sub compute_all_statistics {
1475: my ($r) = @_;
1476: if (@StatsArray > 0) {
1477: # Assume we have already computed the statistics
1478: return;
1479: }
1480: my $c = $r->connection;
1.97 matthew 1481: foreach my $seq (@sequences) {
1.73 matthew 1482: last if ($c->aborted);
1.82 matthew 1483: &compute_sequence_statistics($seq);
1.73 matthew 1484: &compute_statistics_on_sequence($seq);
1.49 matthew 1485: }
1486: }
1487:
1.73 matthew 1488: sub sort_data {
1489: my ($sortkey) = @_;
1490: return if (! @StatsArray);
1.45 matthew 1491: #
1.73 matthew 1492: # Sort the data
1493: my $sortby = undef;
1.49 matthew 1494: foreach my $field (@Fields) {
1.73 matthew 1495: if ($sortkey eq $field->{'name'}) {
1496: $sortby = $field->{'name'};
1.45 matthew 1497: }
1.26 stredwic 1498: }
1.73 matthew 1499: if (! defined($sortby) || $sortby eq '' || $sortby eq 'problem_num') {
1500: $sortby = 'container';
1501: }
1502: if ($sortby ne 'container') {
1503: # $sortby is already defined, so we can charge ahead
1504: if ($sortby =~ /^(title|part)$/i) {
1505: # Alpha comparison
1506: @StatsArray = sort {
1507: lc($a->{$sortby}) cmp lc($b->{$sortby}) ||
1508: lc($a->{'title'}) cmp lc($b->{'title'}) ||
1509: lc($a->{'part'}) cmp lc($b->{'part'});
1510: } @StatsArray;
1.24 stredwic 1511: } else {
1.73 matthew 1512: # Numerical comparison
1513: @StatsArray = sort {
1514: my $retvalue = 0;
1515: if ($b->{$sortby} eq 'nan') {
1516: if ($a->{$sortby} ne 'nan') {
1517: $retvalue = -1;
1518: } else {
1519: $retvalue = 0;
1520: }
1521: }
1522: if ($a->{$sortby} eq 'nan') {
1523: if ($b->{$sortby} ne 'nan') {
1524: $retvalue = 1;
1525: }
1526: }
1527: if ($retvalue eq '0') {
1528: $retvalue = $b->{$sortby} <=> $a->{$sortby} ||
1529: lc($a->{'title'}) <=> lc($b->{'title'}) ||
1530: lc($a->{'part'}) <=> lc($b->{'part'});
1531: }
1532: $retvalue;
1533: } @StatsArray;
1.24 stredwic 1534: }
1535: }
1.45 matthew 1536: #
1.73 matthew 1537: # Renumber the data set
1538: my $count;
1539: foreach my $data (@StatsArray) {
1540: $data->{'problem_num'} = ++$count;
1541: }
1.24 stredwic 1542: return;
1.48 matthew 1543: }
1544:
1.70 matthew 1545: ########################################################
1546: ########################################################
1547:
1548: =pod
1549:
1550: =item &get_statistics()
1551:
1.117 bisitz 1552: Wrapper routine from the call to loncoursedata::get_problem_statistics.
1.73 matthew 1553: Calls lonstathelpers::get_time_limits() to limit the data set by time
1554: and &compute_discrimination_factor
1.70 matthew 1555:
1556: Inputs: $sequence, $resource, $part, $problem_num
1557:
1.117 bisitz 1558: Returns: Hash reference with statistics data from
1.70 matthew 1559: loncoursedata::get_problem_statistics.
1560:
1561: =cut
1562:
1563: ########################################################
1564: ########################################################
1.48 matthew 1565: sub get_statistics {
1.49 matthew 1566: my ($sequence,$resource,$part,$problem_num) = @_;
1.48 matthew 1567: #
1.70 matthew 1568: my ($starttime,$endtime) = &Apache::lonstathelpers::get_time_limits();
1.97 matthew 1569: my $symb = $resource->symb;
1.104 albertel 1570: my $courseid = $env{'request.course.id'};
1.48 matthew 1571: #
1.49 matthew 1572: my $data = &Apache::loncoursedata::get_problem_statistics
1.102 matthew 1573: ([&Apache::lonstatistics::get_selected_sections()],
1.108 raeburn 1574: [&Apache::lonstatistics::get_selected_groups()],
1.66 matthew 1575: $Apache::lonstatistics::enrollment_status,
1.70 matthew 1576: $symb,$part,$courseid,$starttime,$endtime);
1.85 matthew 1577: $data->{'symb'} = $symb;
1.49 matthew 1578: $data->{'part'} = $part;
1579: $data->{'problem_num'} = $problem_num;
1.97 matthew 1580: $data->{'container'} = $sequence->compTitle;
1581: $data->{'title'} = $resource->compTitle;
1582: $data->{'title.link'} = $resource->src.'?symb='.
1.109 www 1583: &escape($resource->symb);
1.49 matthew 1584: #
1.76 matthew 1585: if ($SelectedFields{'deg_of_disc'}) {
1.117 bisitz 1586: $data->{'deg_of_disc'} =
1.76 matthew 1587: &compute_discrimination_factor($resource,$part,$sequence);
1588: }
1.83 matthew 1589: #
1590: # Store in metadata if computations were done for all students
1.84 matthew 1591: if ($data->{'num_students'} > 1) {
1.102 matthew 1592: my @Sections = &Apache::lonstatistics::get_selected_sections();
1.84 matthew 1593: my $sections = '"'.join(' ',@Sections).'"';
1594: $sections =~ s/&+/_/g; # Ensure no special characters
1595: $data->{'sections'}=$sections;
1.104 albertel 1596: $data->{'course'} = $env{'request.course.id'};
1.97 matthew 1597: my $urlres=(&Apache::lonnet::decode_symb($resource->symb))[2];
1.84 matthew 1598: $data->{'urlres'}=$urlres;
1.117 bisitz 1599: my %storestats =
1.84 matthew 1600: &LONCAPA::lonmetadata::dynamic_metadata_storage($data);
1.117 bisitz 1601: my ($dom,$user) = ($urlres=~m{^($LONCAPA::domain_re)/($LONCAPA::username_re)});
1.83 matthew 1602: &Apache::lonnet::put('nohist_resevaldata',\%storestats,$dom,$user);
1603: }
1.85 matthew 1604: #
1.95 matthew 1605: $data->{'tries_per_correct'} = $data->{'tries'} /
1606: ($data->{'num_solved'}+0.1);
1607: #
1.85 matthew 1608: # Get the due date for research purposes (commented out most of the time)
1.112 raeburn 1609: # my $duedate = &Apache::lonnet::EXT('resource.'.$part.'.duedate',$symb);;
1610: # my $opendate = &Apache::lonnet::EXT('resource.'.$part.'.opendate',$symb);
1611: # my $maxtries = &Apache::lonnet::EXT('resource.'.$part.'.maxtries',$symb);
1612: # my $hinttries = &Apache::lonnet::EXT('resource.'.$part.'.hinttries',$symb);
1613: my $weight = &Apache::lonnet::EXT('resource.'.$part.'.weight',$symb);
1614: $data->{'weight'} = $weight;
1.117 bisitz 1615: # $data->{'duedate'} = $duedate;
1.112 raeburn 1616: # $data->{'opendate'} = $opendate;
1617: # $data->{'maxtries'} = $maxtries;
1618: # $data->{'hinttries'} = $hinttries;
1.86 matthew 1619: # $data->{'resptypes'} = join(',',@{$resource->{'partdata'}->{$part}->{'ResponseTypes'}});
1.49 matthew 1620: return $data;
1.71 matthew 1621: }
1622:
1623: ###############################################
1624: ###############################################
1625:
1626: =pod
1627:
1628: =item &compute_discrimination_factor()
1629:
1630: Inputs: $Resource, $Sequence
1631:
1632: Returns: integer between -1 and 1
1633:
1634: =cut
1635:
1636: ###############################################
1637: ###############################################
1638: sub compute_discrimination_factor {
1.97 matthew 1639: my ($resource,$part,$seq) = @_;
1640: my $symb = $resource->symb;
1.71 matthew 1641: my @Resources;
1.97 matthew 1642: foreach my $res (&Apache::lonstathelpers::get_resources($navmap,$seq)){
1643: next if ($res->symb eq $symb);
1644: push (@Resources,$res->symb);
1.71 matthew 1645: }
1646: #
1647: # rank
1.83 matthew 1648: my ($starttime,$endtime) = &Apache::lonstathelpers::get_time_limits();
1.117 bisitz 1649: my $ranking =
1.71 matthew 1650: &Apache::loncoursedata::rank_students_by_scores_on_resources
1651: (\@Resources,
1.102 matthew 1652: [&Apache::lonstatistics::get_selected_sections()],
1.108 raeburn 1653: [&Apache::lonstatistics::get_selected_groups()],
1.83 matthew 1654: $Apache::lonstatistics::enrollment_status,undef,
1.106 bowersj2 1655: $starttime,$endtime, $symb);
1.71 matthew 1656: #
1657: # compute their percent scores on the problems in the sequence,
1658: my $number_to_grab = int(scalar(@{$ranking})/4);
1659: my $num_students = scalar(@{$ranking});
1.117 bisitz 1660: my @BottomSet = map { $_->[&Apache::loncoursedata::RNK_student()];
1.71 matthew 1661: } @{$ranking}[0..$number_to_grab];
1.117 bisitz 1662: my @TopSet =
1663: map {
1664: $_->[&Apache::loncoursedata::RNK_student()];
1.106 bowersj2 1665: } @{$ranking}[-$number_to_grab..0];
1.91 matthew 1666: if (! @BottomSet || (@BottomSet == 1 && $BottomSet[0] eq '') ||
1667: ! @TopSet || (@TopSet == 1 && $TopSet[0] eq '')) {
1668: return 'nan';
1669: }
1.117 bisitz 1670: my ($bottom_sum,$bottom_max) =
1.97 matthew 1671: &Apache::loncoursedata::get_sum_of_scores($symb,$part,\@BottomSet,
1.83 matthew 1672: undef,$starttime,$endtime);
1.117 bisitz 1673: my ($top_sum,$top_max) =
1.97 matthew 1674: &Apache::loncoursedata::get_sum_of_scores($symb,$part,\@TopSet,
1.83 matthew 1675: undef,$starttime,$endtime);
1.71 matthew 1676: my $deg_of_disc;
1677: if ($top_max == 0 || $bottom_max==0) {
1678: $deg_of_disc = 'nan';
1679: } else {
1680: $deg_of_disc = ($top_sum/$top_max) - ($bottom_sum/$bottom_max);
1681: }
1682: #&Apache::lonnet::logthis(' '.$top_sum.'/'.$top_max.
1683: # ' - '.$bottom_sum.'/'.$bottom_max);
1684: return $deg_of_disc;
1.1 stredwic 1685: }
1.12 minaeibi 1686:
1.45 matthew 1687: ###############################################
1688: ###############################################
1.79 matthew 1689: ##
1690: ## Compute KR-21
1691: ##
1692: ## To compute KR-21, you need the following information:
1693: ##
1694: ## K=the number of items in your test
1695: ## M=the mean score on the test
1.117 bisitz 1696: ## s=the standard deviation of the scores on your test
1.79 matthew 1697: ##
1698: ## then:
1.117 bisitz 1699: ##
1.79 matthew 1700: ## KR-21 rk= [K/(K-1)] * [1- (M*(K-M))/(K*s^2))]
1701: ##
1702: ###############################################
1703: ###############################################
1704: sub compute_sequence_statistics {
1705: my ($seq) = @_;
1.97 matthew 1706: my $symb = $seq->symb;
1.79 matthew 1707: my @Resources;
1.97 matthew 1708: my $part_count;
1709: foreach my $res (&Apache::lonstathelpers::get_resources($navmap,$seq)) {
1710: push (@Resources,$res->symb);
1711: $part_count += scalar(@{$res->parts});
1.79 matthew 1712: }
1713: my ($starttime,$endtime) = &Apache::lonstathelpers::get_time_limits();
1714: #
1715: # First compute statistics based on student scores
1.117 bisitz 1716: my ($smin,$smax,$sMean,$sSTD,$scount,$sMAX) =
1.79 matthew 1717: &Apache::loncoursedata::score_stats
1.102 matthew 1718: ([&Apache::lonstatistics::get_selected_sections()],
1.108 raeburn 1719: [&Apache::lonstatistics::get_selected_groups()],
1.79 matthew 1720: $Apache::lonstatistics::enrollment_status,
1721: \@Resources,$starttime,$endtime,undef);
1.97 matthew 1722: $SeqStat{$symb}->{'title'} = $seq->compTitle;
1.79 matthew 1723: $SeqStat{$symb}->{'scoremax'} = $smax;
1724: $SeqStat{$symb}->{'scoremin'} = $smin;
1725: $SeqStat{$symb}->{'scoremean'} = $sMean;
1726: $SeqStat{$symb}->{'scorestd'} = $sSTD;
1727: $SeqStat{$symb}->{'scorecount'} = $scount;
1728: $SeqStat{$symb}->{'max_possible'} = $sMAX;
1729: #
1730: # Compute statistics based on the number of correct problems
1.117 bisitz 1731: # 'correct' is taken to mean
1.79 matthew 1732: my ($cmin,$cmax,$cMean,$cSTD,$ccount)=
1733: &Apache::loncoursedata::count_stats
1.102 matthew 1734: ([&Apache::lonstatistics::get_selected_sections()],
1.108 raeburn 1735: [&Apache::lonstatistics::get_selected_groups()],
1.79 matthew 1736: $Apache::lonstatistics::enrollment_status,
1737: \@Resources,$starttime,$endtime,undef);
1.97 matthew 1738: my $K = $part_count;
1.79 matthew 1739: my $kr_21;
1740: if ($K > 1 && $cSTD > 0) {
1741: $kr_21 = ($K/($K-1)) * (1 - $cMean*($K-$cMean)/($K*$cSTD**2));
1742: } else {
1743: $kr_21 = 'nan';
1744: }
1745: $SeqStat{$symb}->{'countmax'} = $cmax;
1746: $SeqStat{$symb}->{'countmin'} = $cmin;
1747: $SeqStat{$symb}->{'countstd'} = $cSTD;
1.82 matthew 1748: $SeqStat{$symb}->{'countmean'} = $cMean;
1.79 matthew 1749: $SeqStat{$symb}->{'count'} = $ccount;
1750: $SeqStat{$symb}->{'items'} = $K;
1751: $SeqStat{$symb}->{'KR-21'}=$kr_21;
1752: return;
1753: }
1754:
1755:
1.47 matthew 1756:
1757: =pod
1758:
1.73 matthew 1759: =item ProblemStatisticsLegend
1760:
1761: =over 4
1762:
1763: =item #Stdnts
1764: Total number of students attempted the problem.
1765:
1766: =item Tries
1767: Total number of tries for solving the problem.
1.59 matthew 1768:
1.73 matthew 1769: =item Max Tries
1770: Largest number of tries for solving the problem by a student.
1771:
1772: =item Mean
1773: Average number of tries. [ Tries / #Stdnts ]
1774:
1775: =item #YES
1776: Number of students solved the problem correctly.
1777:
1778: =item #yes
1779: Number of students solved the problem by override.
1780:
1781: =item %Wrong
1782: Percentage of students who tried to solve the problem
1783: but is still incorrect. [ 100*((#Stdnts-(#YES+#yes))/#Stdnts) ]
1784:
1785: =item DoDiff
1786: Degree of Difficulty of the problem.
1787: [ 1 - ((#YES+#yes) / Tries) ]
1788:
1789: =item S.D.
1790: Standard Deviation of the tries.
1791: [ sqrt(sum((Xi - Mean)^2)) / (#Stdnts-1)
1792: where Xi denotes every student\'s tries ]
1793:
1794: =item Skew.
1795: Skewness of the students tries.
1796: [(sqrt( sum((Xi - Mean)^3) / #Stdnts)) / (S.D.^3)]
1797:
1798: =item Dis.F.
1799: Discrimination Factor: A Standard for evaluating the
1800: problem according to a Criterion<br>
1801:
1802: =item [Criterion to group students into %27 Upper Students -
1803: and %27 Lower Students]
1804: 1st Criterion for Sorting the Students:
1805: Sum of Partial Credit Awarded / Total Number of Tries
1806: 2nd Criterion for Sorting the Students:
1807: Total number of Correct Answers / Total Number of Tries
1808:
1809: =item Disc.
1810: Number of Students had at least one discussion.
1811:
1812: =back
1.47 matthew 1813:
1814: =cut
1.73 matthew 1815:
1816: ############################################################
1817: ############################################################
1.4 minaeibi 1818:
1.1 stredwic 1819: 1;
1820: __END__
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