Annotation of loncom/interface/statistics/lonproblemstatistics.pm, revision 1.120
1.1 stredwic 1: # The LearningOnline Network with CAPA
2: #
1.120 ! www 3: # $Id: lonproblemstatistics.pm,v 1.119 2011/01/17 00:19:41 www 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: #
1.115 bisitz 647: $Str .= '</p>';
1.59 matthew 648: $Str .= '<input type="submit" name="GenerateStatistics" value="'.
649: &mt('Generate Statistics').'" />';
1.115 bisitz 650: $Str .= (' 'x10);
1.87 matthew 651: #
1.73 matthew 652: return $Str;
1.41 matthew 653: }
1.25 stredwic 654:
1.41 matthew 655: ###############################################
656: ###############################################
1.28 stredwic 657:
1.47 matthew 658: =pod
659:
660: =item &BuildProblemStatisticsPage()
661:
662: Main interface to problem statistics.
663:
664: =cut
665:
1.41 matthew 666: ###############################################
667: ###############################################
1.97 matthew 668: my $navmap;
669: my @sequences;
670:
1.105 albertel 671: sub clean_up {
672: undef($navmap);
673: undef(@sequences);
674: }
675:
1.41 matthew 676: sub BuildProblemStatisticsPage {
677: my ($r,$c)=@_;
1.97 matthew 678: undef($navmap);
679: undef(@sequences);
1.61 matthew 680: #
681: my %Saveable_Parameters = ('Status' => 'scalar',
682: 'statsoutputmode' => 'scalar',
683: 'Section' => 'array',
1.108 raeburn 684: 'Groups' => 'array',
1.61 matthew 685: 'StudentData' => 'array',
1.77 matthew 686: 'Maps' => 'array',
687: 'fieldselections'=> 'array');
1.61 matthew 688: &Apache::loncommon::store_course_settings('statistics',
689: \%Saveable_Parameters);
690: &Apache::loncommon::restore_course_settings('statistics',
691: \%Saveable_Parameters);
692: #
693: &Apache::lonstatistics::PrepareClasslist();
1.41 matthew 694: #
1.73 matthew 695: # Clear the package variables
696: undef(@StatsArray);
1.79 matthew 697: undef(%SeqStat);
1.71 matthew 698: #
1.73 matthew 699: # Finally let the user know we are here
1.119 www 700: $r->print(&Apache::lonhtmlcommon::breadcrumbs('Overall Problem Statistics',
701: 'Statistics_Overall_Key'));
702: &Apache::lonquickgrades::startGradeScreen($r,'statistics');
703:
1.87 matthew 704: my $interface = &CreateInterface($r);
1.57 matthew 705: $r->print($interface);
1.104 albertel 706: $r->print('<input type="hidden" name="sortby" value="'.$env{'form.sortby'}.
1.41 matthew 707: '" />');
1.73 matthew 708: #
1.117 bisitz 709: my @CacheButtonHTML =
1.87 matthew 710: &Apache::lonstathelpers::manage_caches($r,'Statistics','stats_status');
711: my $Str;
712: foreach my $html (@CacheButtonHTML) {
713: $Str.=$html.(' 'x5);
714: }
715: #
716: $r->print($Str);
1.104 albertel 717: if (! exists($env{'form.firstrun'})) {
1.117 bisitz 718: $r->print('<p class="LC_info"><b>'.
1.73 matthew 719: &mt('Press "Generate Statistics" when you are ready.').
1.117 bisitz 720: '</b></p>'.
721: '<p class="LC_info">'.
1.73 matthew 722: &mt('It may take some time to update the student data '.
1.117 bisitz 723: 'for the first analysis. Future analysis this session '.
1.113 bisitz 724: 'will not have this delay.').
1.73 matthew 725: '</p>');
1.105 albertel 726: &clean_up();
1.41 matthew 727: return;
1.28 stredwic 728: }
1.73 matthew 729: $r->rflush();
1.41 matthew 730: #
1.73 matthew 731: # This probably does not need to be done each time we are called, but
732: # it does not slow things down noticably.
733: &Apache::loncoursedata::populate_weight_table();
1.75 matthew 734: #
1.117 bisitz 735: ($navmap,@sequences) =
1.99 matthew 736: &Apache::lonstatistics::selected_sequences_with_assessments();
737: if (! ref($navmap)) {
1.115 bisitz 738: $r->print('<div class="LC_error">'.&mt('A course-wide error occurred.').'</div>'.
1.99 matthew 739: '<h3>'.$navmap.'</h3>');
1.105 albertel 740: &clean_up();
1.99 matthew 741: return;
742: }
1.104 albertel 743: if (exists($env{'form.Excel'})) {
1.102 matthew 744: $r->print('<h4>'.
745: &Apache::lonstatistics::section_and_enrollment_description().
746: '</h4>');
1.73 matthew 747: &Excel_output($r);
1.117 bisitz 748: } else {
1.87 matthew 749: $r->print('<input type="submit" name="Excel" value="'.
750: &mt('Produce Excel Output').'" />'.' 'x5);
751: $r->rflush();
1.102 matthew 752: $r->print('<h4>'.
753: &Apache::lonstatistics::section_and_enrollment_description().
754: '</h4>');
1.75 matthew 755: my $count = 0;
1.97 matthew 756: foreach my $seq (@sequences) {
1.117 bisitz 757: my @resources =
1.97 matthew 758: &Apache::lonstathelpers::get_resources($navmap,$seq);
759: $count += scalar(@resources);
1.75 matthew 760: }
761: if ($count > 10) {
762: $r->print('<h2>'.
763: &mt('Compiling statistics for [_1] problems',$count).
764: '</h2>');
765: if ($count > 30) {
766: $r->print('<h3>'.&mt('This will take some time.').'</h3>');
767: }
768: $r->rflush();
769: }
770: #
1.104 albertel 771: my $sortby = $env{'form.sortby'};
1.73 matthew 772: $sortby = 'container' if (! defined($sortby) || $sortby =~ /^\s*$/);
1.104 albertel 773: my $plot = $env{'form.plot'};
1.75 matthew 774: if ($plot eq '' || $plot eq 'none') {
775: undef($plot);
776: }
1.73 matthew 777: if ($sortby eq 'container' && ! defined($plot)) {
1.79 matthew 778: &output_sequence_statistics($r);
1.73 matthew 779: &output_html_by_sequence($r);
780: } else {
781: if (defined($plot)) {
782: &make_plot($r,$plot);
783: }
784: &output_html_stats($r);
1.79 matthew 785: &output_sequence_statistics($r);
1.73 matthew 786: }
787: }
1.105 albertel 788: &clean_up();
1.73 matthew 789: return;
790: }
791:
1.79 matthew 792: sub output_sequence_statistics {
793: my ($r) = @_;
794: my $c=$r->connection();
1.90 matthew 795: $r->print('<h2>'.&mt('Sequence Statistics').
796: &Apache::loncommon::help_open_topic('Statistics_Sequence').
797: '</h2>');
1.79 matthew 798: $r->print('<table border="0"><tr><td bgcolor="#777777">'."\n".
799: '<table border="0" cellpadding="3">'."\n".
800: '<tr bgcolor="#FFFFE6">');
801: $r->print(&sequence_html_header());
1.117 bisitz 802: foreach my $seq (@sequences) {
1.79 matthew 803: last if ($c->aborted);
804: &compute_sequence_statistics($seq);
805: $r->print(&sequence_html_output($seq));
806: }
807: $r->print('</table>');
808: $r->print('</table>');
809: $r->rflush();
810: return;
811: }
812:
813:
1.73 matthew 814: ##########################################################
815: ##########################################################
816: ##
817: ## HTML output routines
818: ##
819: ##########################################################
820: ##########################################################
821: sub output_html_by_sequence {
822: my ($r) = @_;
823: my $c = $r->connection();
824: $r->print(&html_preamble());
1.41 matthew 825: #
1.97 matthew 826: foreach my $seq (@sequences) {
1.73 matthew 827: last if ($c->aborted);
1.97 matthew 828: $r->print("<h3>".$seq->compTitle."</h3>".
1.73 matthew 829: '<table border="0"><tr><td bgcolor="#777777">'."\n".
830: '<table border="0" cellpadding="3">'."\n".
831: '<tr bgcolor="#FFFFE6">'.
832: &statistics_table_header('no container')."</tr>\n");
833: my @Data = &compute_statistics_on_sequence($seq);
834: foreach my $data (@Data) {
835: $r->print('<tr>'.&statistics_html_table_data($data,
836: 'no container').
837: "</tr>\n");
1.70 matthew 838: }
1.73 matthew 839: $r->print('</table>'."\n".'</table>'."\n");
1.41 matthew 840: $r->rflush();
1.28 stredwic 841: }
1.41 matthew 842: return;
843: }
1.21 stredwic 844:
1.73 matthew 845: sub output_html_stats {
846: my ($r)=@_;
847: &compute_all_statistics($r);
848: $r->print(&html_preamble());
1.104 albertel 849: &sort_data($env{'form.sortby'});
1.73 matthew 850: #
851: my $count=0;
852: foreach my $data (@StatsArray) {
853: if ($count++ % 50 == 0) {
854: $r->print("</table>\n</table>\n");
855: $r->print('<table border="0"><tr><td bgcolor="#777777">'."\n".
856: '<table border="0" cellpadding="3">'."\n".
857: '<tr bgcolor="#FFFFE6">'.
858: '<tr bgcolor="#FFFFE6">'.
859: &statistics_table_header().
860: "</tr>\n");
861: }
862: $r->print('<tr>'.&statistics_html_table_data($data)."</tr>\n");
863: }
864: $r->print("</table>\n</table>\n");
865: return;
866: }
1.47 matthew 867:
1.73 matthew 868: sub html_preamble {
869: my $Str='';
870: $Str .= "<h2>".
1.104 albertel 871: $env{'course.'.$env{'request.course.id'}.'.description'}.
1.73 matthew 872: "</h2>\n";
873: my ($starttime,$endtime) = &Apache::lonstathelpers::get_time_limits();
874: if (defined($starttime) || defined($endtime)) {
875: # Inform the user what the time limits on the data are.
876: $Str .= '<h3>'.&mt('Statistics on submissions from [_1] to [_2]',
877: &Apache::lonlocal::locallocaltime($starttime),
878: &Apache::lonlocal::locallocaltime($endtime)
879: ).'</h3>';
880: }
881: $Str .= "<h3>".&mt('Compiled on [_1]',
882: &Apache::lonlocal::locallocaltime(time))."</h3>";
883: return $Str;
884: }
1.47 matthew 885:
886:
1.44 matthew 887: ###############################################
888: ###############################################
1.73 matthew 889: ##
890: ## Misc HTML output routines
891: ##
892: ###############################################
893: ###############################################
894: sub statistics_html_table_data {
895: my ($data,$options) = @_;
896: my $row = '';
897: foreach my $field (@Fields) {
898: next if ($options =~ /no $field->{'name'}/);
1.76 matthew 899: next if ($field->{'selected'} ne 'yes');
1.73 matthew 900: $row .= '<td bgcolor="'.$field->{'color'}.'"';
901: if (exists($field->{'align'})) {
902: $row .= ' align="'.$field->{'align'}.'"';
1.41 matthew 903: }
1.73 matthew 904: $row .= '>';
905: if (exists($field->{'special'}) && $field->{'special'} eq 'link') {
906: $row .= '<a href="'.$data->{$field->{'name'}.'.link'}.'">';
1.41 matthew 907: }
1.92 matthew 908: if (exists($field->{'format'}) && $data->{$field->{'name'}} !~ /[A-Z]/i) {
1.73 matthew 909: $row .= sprintf($field->{'format'},$data->{$field->{'name'}});
910: } else {
911: $row .= $data->{$field->{'name'}};
912: }
913: if (exists($field->{'special'}) && $field->{'special'} eq 'link') {
914: $row.= '</a>';
915: }
916: $row .= '</td>';
1.21 stredwic 917: }
1.73 matthew 918: return $row;
1.41 matthew 919: }
1.25 stredwic 920:
1.73 matthew 921: sub statistics_table_header {
922: my ($options) = @_;
923: my $header_row;
924: foreach my $field (@Fields) {
925: next if ($options =~ /no $field->{'name'}/);
1.76 matthew 926: next if ($field->{'selected'} ne 'yes');
1.73 matthew 927: $header_row .= '<th>';
928: if (exists($field->{'sortable'}) && $field->{'sortable'} eq 'yes') {
929: $header_row .= '<a href="javascript:'.
930: 'document.Statistics.sortby.value='."'".$field->{'name'}."'".
931: ';document.Statistics.submit();">';
932: }
933: $header_row .= &mt($field->{'title'});
934: if ($options =~ /sortable/) {
935: $header_row.= '</a>';
936: }
937: if ($options !~ /no plots/ &&
938: exists($field->{'graphable'}) &&
939: $field->{'graphable'} eq 'yes') {
940: $header_row.=' (';
941: $header_row .= '<a href="javascript:'.
942: "document.Statistics.plot.value='$field->{'name'}'".
943: ';document.Statistics.submit();">';
944: $header_row .= &mt('plot').'</a>)';
945: }
946: $header_row .= '</th>';
947: }
948: return $header_row;
949: }
1.26 stredwic 950:
1.79 matthew 951: sub sequence_html_header {
952: my $Str .= '<tr>';
953: foreach my $field (@SeqFields) {
954: # next if ($field->{'selected'} ne 'yes');
955: $Str .= '<th bgcolor="'.$field->{'color'}.'"';
956: $Str .= '>'.$field->{'title'}.'</th>';
957: }
958: $Str .= '</tr>';
959: return $Str;
960: }
961:
962:
963: sub sequence_html_output {
964: my ($seq) = @_;
1.97 matthew 965: my $data = $SeqStat{$seq->symb};
1.79 matthew 966: my $row = '<tr>';
967: foreach my $field (@SeqFields) {
1.82 matthew 968: next if ($field->{'selected'} ne 'yes');
1.79 matthew 969: $row .= '<td bgcolor="'.$field->{'color'}.'"';
970: if (exists($field->{'align'})) {
971: $row .= ' align="'.$field->{'align'}.'"';
972: }
973: $row .= '>';
974: if (exists($field->{'format'})) {
975: $row .= sprintf($field->{'format'},$data->{$field->{'name'}});
976: } else {
977: $row .= $data->{$field->{'name'}};
978: }
979: $row .= '</td>';
980: }
981: $row .= '</tr>'."\n";
982: return $row;
983: }
984:
1.73 matthew 985: ####################################################
986: ####################################################
987: ##
988: ## Plotting Routines
989: ##
990: ####################################################
991: ####################################################
992: sub make_plot {
993: my ($r,$plot) = @_;
994: &compute_all_statistics($r);
1.104 albertel 995: &sort_data($env{'form.sortby'});
1.73 matthew 996: if ($plot eq 'degrees') {
997: °rees_plot($r);
1.74 matthew 998: } elsif ($plot eq 'tries statistics') {
999: &tries_data_plot($r);
1.73 matthew 1000: } else {
1001: &make_single_stat_plot($r,$plot);
1002: }
1003: return;
1004: }
1.47 matthew 1005:
1.73 matthew 1006: sub make_single_stat_plot {
1007: my ($r,$datafield) = @_;
1.41 matthew 1008: #
1.73 matthew 1009: my $title; my $yaxis;
1010: foreach my $field (@Fields) {
1011: next if ($field->{'name'} ne $datafield);
1012: $title = $field->{'long_title'};
1013: $yaxis = $field->{'title'};
1014: last;
1015: }
1016: if ($title eq '' || $yaxis eq '') {
1017: # datafield is something we do not know enough about to plot
1018: $r->print('<h3>'.
1019: &mt('Unable to plot the requested statistic.').
1020: '</h3>');
1021: return;
1.49 matthew 1022: }
1023: #
1.73 matthew 1024: # Build up the data sets to plot
1.117 bisitz 1025: my @Labels;
1.73 matthew 1026: my @Data;
1027: my $max = 1;
1028: foreach my $data (@StatsArray) {
1029: push(@Labels,$data->{'problem_num'});
1030: push(@Data,$data->{$datafield});
1031: if ($data->{$datafield}>$max) {
1032: $max = $data->{$datafield};
1033: }
1034: }
1035: foreach (1,2,3,4,5,10,15,20,25,40,50,75,100,150,200,250,300,500,600,750,
1036: 1000,1500,2000,2500,3000,3500,4000,5000,7500,10000,15000,20000) {
1037: if ($max <= $_) {
1038: $max = $_;
1039: last;
1.42 matthew 1040: }
1041: }
1.73 matthew 1042: if ($max > 20000) {
1043: $max = 10000*(int($max/10000)+1);
1.42 matthew 1044: }
1.73 matthew 1045: #
1046: $r->print("<p>".&Apache::loncommon::DrawBarGraph($title,
1047: 'Problem Number',
1048: $yaxis,
1049: $max,
1050: undef, # colors
1051: \@Labels,
1052: \@Data)."</p>\n");
1053: return;
1054: }
1055:
1056: sub degrees_plot {
1057: my ($r)=@_;
1058: my $count = scalar(@StatsArray);
1059: my $width = 50 + 10*$count;
1060: $width = 300 if ($width < 300);
1061: my $height = 300;
1062: my $plot = '';
1063: my $ymax = 0;
1064: my $ymin = 0;
1.117 bisitz 1065: my @Disc; my @Diff; my @Labels;
1.73 matthew 1066: foreach my $data (@StatsArray) {
1067: push(@Labels,$data->{'problem_num'});
1068: my $disc = $data->{'deg_of_disc'};
1069: my $diff = $data->{'deg_of_diff'};
1070: push(@Disc,$disc);
1071: push(@Diff,$diff);
1072: #
1073: $ymin = $disc if ($ymin > $disc);
1074: $ymin = $diff if ($ymin > $diff);
1075: $ymax = $disc if ($ymax < $disc);
1076: $ymax = $diff if ($ymax < $diff);
1077: }
1078: #
1079: # Make sure we show relevant information.
1080: if ($ymin < 0) {
1081: if (abs($ymin) < 0.05) {
1082: $ymin = 0;
1083: } else {
1084: $ymin = -1;
1.42 matthew 1085: }
1086: }
1.73 matthew 1087: if ($ymax > 0) {
1088: if (abs($ymax) < 0.05) {
1089: $ymax = 0;
1.42 matthew 1090: } else {
1.73 matthew 1091: $ymax = 1;
1.42 matthew 1092: }
1.43 matthew 1093: }
1.49 matthew 1094: #
1.73 matthew 1095: my $xmax = $Labels[-1];
1096: if ($xmax > 50) {
1097: if ($xmax % 10 != 0) {
1098: $xmax = 10 * (int($xmax/10)+1);
1099: }
1100: } else {
1101: if ($xmax % 5 != 0) {
1102: $xmax = 5 * (int($xmax/5)+1);
1.49 matthew 1103: }
1.26 stredwic 1104: }
1.41 matthew 1105: #
1.73 matthew 1106: my $discdata .= '<data>'.join(',',@Labels).'</data>'.$/.
1107: '<data>'.join(',',@Disc).'</data>'.$/;
1108: #
1109: my $diffdata .= '<data>'.join(',',@Labels).'</data>'.$/.
1110: '<data>'.join(',',@Diff).'</data>'.$/;
1111: #
1.81 matthew 1112: my $title = 'Degree of Discrimination\nand Degree of Difficulty';
1113: if ($xmax > 50) {
1114: $title = 'Degree of Discrimination and Degree of Difficulty';
1115: }
1116: #
1.73 matthew 1117: $plot=<<"END";
1118: <gnuplot
1119: texfont="10"
1120: fgcolor="x000000"
1121: plottype="Cartesian"
1122: font="large"
1123: grid="on"
1124: align="center"
1125: border="on"
1126: transparent="on"
1.81 matthew 1127: alttag="Degree of Discrimination and Degree of Difficulty Plot"
1.73 matthew 1128: samples="100"
1129: bgcolor="xffffff"
1130: height="$height"
1131: width="$width">
1132: <key
1133: pos="top right"
1134: title=""
1135: box="off" />
1.81 matthew 1136: <title>$title</title>
1.73 matthew 1137: <axis xmin="0" ymin="$ymin" xmax="$xmax" ymax="$ymax" color="x000000" />
1138: <xlabel>Problem Number</xlabel>
1139: <curve
1140: linestyle="linespoints"
1141: name="DoDisc"
1142: pointtype="0"
1143: color="x000000">
1144: $discdata
1145: </curve>
1146: <curve
1147: linestyle="linespoints"
1148: name="DoDiff"
1149: pointtype="0"
1150: color="xFF0000">
1151: $diffdata
1152: </curve>
1153: </gnuplot>
1154: END
1.117 bisitz 1155: my $plotresult =
1.73 matthew 1156: '<p>'.&Apache::lonxml::xmlparse($r,'web',$plot).'</p>'.$/;
1157: $r->print($plotresult);
1.41 matthew 1158: return;
1.42 matthew 1159: }
1160:
1.74 matthew 1161: sub tries_data_plot {
1162: my ($r)=@_;
1163: my $count = scalar(@StatsArray);
1164: my $width = 50 + 10*$count;
1165: $width = 300 if ($width < 300);
1166: my $height = 300;
1167: my $plot = '';
1168: my @STD; my @Mean; my @Max; my @Min;
1169: my @Labels;
1170: my $ymax = 5;
1171: foreach my $data (@StatsArray) {
1172: my $max = $data->{'mean_tries'} + $data->{'std_tries'};
1173: $ymax = $max if ($ymax < $max);
1174: $ymax = $max if ($ymax < $max);
1175: push(@Labels,$data->{'problem_num'});
1176: push(@STD,$data->{'std_tries'});
1177: push(@Mean,$data->{'mean_tries'});
1178: }
1179: #
1180: # Make sure we show relevant information.
1181: my $xmax = $Labels[-1];
1182: if ($xmax > 50) {
1183: if ($xmax % 10 != 0) {
1184: $xmax = 10 * (int($xmax/10)+1);
1185: }
1186: } else {
1187: if ($xmax % 5 != 0) {
1188: $xmax = 5 * (int($xmax/5)+1);
1189: }
1190: }
1191: $ymax = int($ymax)+1+2;
1192: #
1193: my $std_data .= '<data>'.join(',',@Labels).'</data>'.$/.
1194: '<data>'.join(',',@Mean).'</data>'.$/;
1195: #
1196: my $std_error_data .= '<data>'.join(',',@Labels).'</data>'.$/.
1197: '<data>'.join(',',@Mean).'</data>'.$/.
1198: '<data>'.join(',',@STD).'</data>'.$/;
1199: #
1.81 matthew 1200: my $title = 'Mean and S.D. of Tries';
1201: if ($xmax > 25) {
1202: $title = 'Mean and Standard Deviation of Tries';
1203: }
1204: #
1.74 matthew 1205: $plot=<<"END";
1206: <gnuplot
1207: texfont="10"
1208: fgcolor="x000000"
1209: plottype="Cartesian"
1210: font="large"
1211: grid="on"
1212: align="center"
1213: border="on"
1214: transparent="on"
1.81 matthew 1215: alttag="Mean and S.D of Tries Plot"
1.74 matthew 1216: samples="100"
1217: bgcolor="xffffff"
1218: height="$height"
1219: width="$width">
1.81 matthew 1220: <title>$title</title>
1.74 matthew 1221: <axis xmin="0" ymin="0" xmax="$xmax" ymax="$ymax" color="x000000" />
1222: <xlabel>Problem Number</xlabel>
1.81 matthew 1223: <ylabel>Number of Tries</ylabel>
1.74 matthew 1224: <curve
1225: linestyle="yerrorbars"
1226: name="S.D. Tries"
1227: pointtype="1"
1228: color="x666666">
1229: $std_error_data
1230: </curve>
1231: <curve
1232: linestyle="points"
1233: name="Mean Tries"
1234: pointtype="1"
1235: color="xCC4444">
1236: $std_data
1237: </curve>
1238: </gnuplot>
1239: END
1.117 bisitz 1240: my $plotresult =
1.74 matthew 1241: '<p>'.&Apache::lonxml::xmlparse($r,'web',$plot).'</p>'.$/;
1242: $r->print($plotresult);
1243: return;
1244: }
1245:
1.73 matthew 1246: sub plot_dropdown {
1247: my $current = '';
1248: #
1.104 albertel 1249: if (defined($env{'form.plot'})) {
1250: $current = $env{'form.plot'};
1.73 matthew 1251: }
1252: #
1253: my @Additional_Plots = (
1254: { graphable=>'yes',
1255: name => 'degrees',
1.81 matthew 1256: title => 'Difficulty Indexes' },
1.74 matthew 1257: { graphable=>'yes',
1258: name => 'tries statistics',
1.81 matthew 1259: title => 'Tries Statistics' });
1.73 matthew 1260: #
1261: my $Str= "\n".'<select name="plot" size="1">';
1262: $Str .= '<option name="none"></option>'."\n";
1263: $Str .= '<option name="none2">none</option>'."\n";
1.81 matthew 1264: foreach my $field (@Additional_Plots,@Fields) {
1.73 matthew 1265: if (! exists($field->{'graphable'}) ||
1266: $field->{'graphable'} ne 'yes') {
1267: next;
1268: }
1269: $Str .= '<option value="'.$field->{'name'}.'"';
1270: if ($field->{'name'} eq $current) {
1271: $Str .= ' selected ';
1272: }
1273: $Str.= '>'.&mt($field->{'title'}).'</option>'."\n";
1274: }
1275: $Str .= '</select>'."\n";
1276: return $Str;
1277: }
1278:
1.41 matthew 1279: ###############################################
1280: ###############################################
1.73 matthew 1281: ##
1282: ## Excel output routines
1283: ##
1.41 matthew 1284: ###############################################
1285: ###############################################
1.73 matthew 1286: sub Excel_output {
1.44 matthew 1287: my ($r) = @_;
1.73 matthew 1288: $r->print('<h2>'.&mt('Preparing Excel Spreadsheet').'</h2>');
1289: ##
1290: ## Compute the statistics
1291: &compute_all_statistics($r);
1292: my $c = $r->connection;
1293: return if ($c->aborted());
1.101 matthew 1294: #
1295: my ($starttime,$endtime) = &Apache::lonstathelpers::get_time_limits();
1.73 matthew 1296: ##
1297: ## Create the excel workbook
1.101 matthew 1298: my ($excel_workbook,$filename,$format) =
1299: &Apache::loncommon::create_workbook($r);
1300: return if (! defined($excel_workbook));
1.44 matthew 1301: #
1302: # Add a worksheet
1.104 albertel 1303: my $sheetname = $env{'course.'.$env{'request.course.id'}.'.description'};
1.44 matthew 1304: if (length($sheetname) > 31) {
1305: $sheetname = substr($sheetname,0,31);
1306: }
1.73 matthew 1307: my $excel_sheet = $excel_workbook->addworksheet(
1308: &Apache::loncommon::clean_excel_name($sheetname));
1309: ##
1310: ## Begin creating excel sheet
1311: ##
1312: my ($rows_output,$cols_output) = (0,0);
1.44 matthew 1313: #
1314: # Put the course description in the header
1315: $excel_sheet->write($rows_output,$cols_output++,
1.104 albertel 1316: $env{'course.'.$env{'request.course.id'}.'.description'},
1.82 matthew 1317: $format->{'h1'});
1.44 matthew 1318: $cols_output += 3;
1319: #
1320: # Put a description of the sections listed
1321: my $sectionstring = '';
1.82 matthew 1322: $excel_sheet->write($rows_output,$cols_output++,
1.103 matthew 1323: &Apache::lonstatistics::section_and_enrollment_description('plaintext'),
1.82 matthew 1324: $format->{'h3'});
1.102 matthew 1325: $cols_output += scalar(&Apache::lonstatistics::get_selected_sections());
1.108 raeburn 1326: $cols_output += scalar(&Apache::lonstatistics::get_selected_groups());
1.44 matthew 1327: #
1.70 matthew 1328: # Time restrictions
1329: my $time_string;
1330: if (defined($starttime)) {
1331: # call localtime but not lonlocal:locallocaltime because excel probably
1332: # cannot handle localized text. Probably.
1333: $time_string .= 'Data collected from '.localtime($time_string);
1334: if (defined($endtime)) {
1335: $time_string .= ' to '.localtime($endtime);
1336: }
1337: $time_string .= '.';
1338: } elsif (defined($endtime)) {
1339: # See note above about lonlocal:locallocaltime
1340: $time_string .= 'Data collected before '.localtime($endtime).'.';
1341: }
1.82 matthew 1342: if (defined($time_string)) {
1343: $excel_sheet->write($rows_output,$cols_output++,$time_string);
1344: $cols_output+= 5;
1345: }
1.70 matthew 1346: #
1.44 matthew 1347: # Put the date in there too
1348: $excel_sheet->write($rows_output,$cols_output++,
1349: 'Compiled on '.localtime(time));
1350: #
1.117 bisitz 1351: $rows_output++;
1.44 matthew 1352: $cols_output=0;
1.82 matthew 1353: ##
1354: ## Sequence Statistics
1.117 bisitz 1355: ##
1.82 matthew 1356: &write_headers($excel_sheet,$format,\$rows_output,\$cols_output,
1357: \@SeqFields);
1.97 matthew 1358: foreach my $seq (@sequences) {
1359: my $data = $SeqStat{$seq->symb};
1.82 matthew 1360: $cols_output=0;
1361: foreach my $field (@SeqFields) {
1362: next if ($field->{'selected'} ne 'yes');
1.85 matthew 1363: my $fieldformat = undef;
1364: if (exists($field->{'excel_format'})) {
1365: $fieldformat = $format->{$field->{'excel_format'}};
1366: }
1.55 matthew 1367: $excel_sheet->write($rows_output,$cols_output++,
1.85 matthew 1368: $data->{$field->{'name'}},$fieldformat);
1.55 matthew 1369: }
1.82 matthew 1370: $rows_output++;
1371: $cols_output=0;
1.55 matthew 1372: }
1.82 matthew 1373: ##
1374: ## Resource Statistics
1375: ##
1.55 matthew 1376: $rows_output++;
1377: $cols_output=0;
1.82 matthew 1378: &write_headers($excel_sheet,$format,\$rows_output,\$cols_output,
1379: \@Fields);
1380: #
1.73 matthew 1381: foreach my $data (@StatsArray) {
1382: $cols_output=0;
1383: foreach my $field (@Fields) {
1.76 matthew 1384: next if ($field->{'selected'} ne 'yes');
1.73 matthew 1385: next if ($field->{'name'} eq 'problem_num');
1.85 matthew 1386: my $fieldformat = undef;
1387: if (exists($field->{'excel_format'})) {
1388: $fieldformat = $format->{$field->{'excel_format'}};
1389: }
1.73 matthew 1390: $excel_sheet->write($rows_output,$cols_output++,
1.85 matthew 1391: $data->{$field->{'name'}},$fieldformat);
1.44 matthew 1392: }
1.73 matthew 1393: $rows_output++;
1.82 matthew 1394: $cols_output=0;
1.44 matthew 1395: }
1396: #
1397: $excel_workbook->close();
1.73 matthew 1398: #
1.44 matthew 1399: # Tell the user where to get their excel file
1400: $r->print('<br />'.
1.59 matthew 1401: '<a href="'.$filename.'">'.
1402: &mt('Your Excel Spreadsheet').'</a>'."\n");
1.44 matthew 1403: $r->rflush();
1404: return;
1405: }
1406:
1.82 matthew 1407: ##
1408: ## &write_headers
1409: ##
1410: sub write_headers {
1411: my ($excel_sheet,$format,$rows_output,$cols_output,$Fields) = @_;
1412: ##
1413: ## First the long titles
1414: foreach my $field (@{$Fields}) {
1415: next if ($field->{'name'} eq 'problem_num');
1416: next if ($field->{'selected'} ne 'yes');
1417: if (exists($field->{'long_title'})) {
1418: $excel_sheet->write($$rows_output,${$cols_output},
1419: $field->{'long_title'},
1420: $format->{'bold'});
1421: } else {
1422: $excel_sheet->write($$rows_output,${$cols_output},'');
1423: }
1424: ${$cols_output}+= 1;
1425: }
1426: ${$cols_output} =0;
1427: ${$rows_output}+=1;
1428: ##
1429: ## Then the short titles
1430: foreach my $field (@{$Fields}) {
1431: next if ($field->{'selected'} ne 'yes');
1432: next if ($field->{'name'} eq 'problem_num');
1.117 bisitz 1433: # Use english for excel as I am not sure how well excel handles
1.82 matthew 1434: # other character sets....
1435: $excel_sheet->write($$rows_output,$$cols_output,
1436: $field->{'title'},
1437: $format->{'bold'});
1438: $$cols_output+=1;
1439: }
1440: ${$cols_output} =0;
1441: ${$rows_output}+=1;
1442: return;
1443: }
1444:
1.73 matthew 1445: ##################################################
1446: ##################################################
1447: ##
1448: ## Statistics Gathering and Manipulation Routines
1449: ##
1450: ##################################################
1451: ##################################################
1452: sub compute_statistics_on_sequence {
1453: my ($seq) = @_;
1454: my @Data;
1.97 matthew 1455: foreach my $res (&Apache::lonstathelpers::get_resources($navmap,$seq)) {
1456: foreach my $part (@{$res->parts}) {
1.118 raeburn 1457: next if (($res->is_survey($part)) || ($res->is_anonsurvey($part))) ;
1.73 matthew 1458: #
1459: # This is where all the work happens
1460: my $data = &get_statistics($seq,$res,$part,scalar(@StatsArray)+1);
1461: push (@Data,$data);
1462: push (@StatsArray,$data);
1.49 matthew 1463: }
1.26 stredwic 1464: }
1.73 matthew 1465: return @Data;
1.41 matthew 1466: }
1.26 stredwic 1467:
1.73 matthew 1468: sub compute_all_statistics {
1469: my ($r) = @_;
1470: if (@StatsArray > 0) {
1471: # Assume we have already computed the statistics
1472: return;
1473: }
1474: my $c = $r->connection;
1.97 matthew 1475: foreach my $seq (@sequences) {
1.73 matthew 1476: last if ($c->aborted);
1.82 matthew 1477: &compute_sequence_statistics($seq);
1.73 matthew 1478: &compute_statistics_on_sequence($seq);
1.49 matthew 1479: }
1480: }
1481:
1.73 matthew 1482: sub sort_data {
1483: my ($sortkey) = @_;
1484: return if (! @StatsArray);
1.45 matthew 1485: #
1.73 matthew 1486: # Sort the data
1487: my $sortby = undef;
1.49 matthew 1488: foreach my $field (@Fields) {
1.73 matthew 1489: if ($sortkey eq $field->{'name'}) {
1490: $sortby = $field->{'name'};
1.45 matthew 1491: }
1.26 stredwic 1492: }
1.73 matthew 1493: if (! defined($sortby) || $sortby eq '' || $sortby eq 'problem_num') {
1494: $sortby = 'container';
1495: }
1496: if ($sortby ne 'container') {
1497: # $sortby is already defined, so we can charge ahead
1498: if ($sortby =~ /^(title|part)$/i) {
1499: # Alpha comparison
1500: @StatsArray = sort {
1501: lc($a->{$sortby}) cmp lc($b->{$sortby}) ||
1502: lc($a->{'title'}) cmp lc($b->{'title'}) ||
1503: lc($a->{'part'}) cmp lc($b->{'part'});
1504: } @StatsArray;
1.24 stredwic 1505: } else {
1.73 matthew 1506: # Numerical comparison
1507: @StatsArray = sort {
1508: my $retvalue = 0;
1509: if ($b->{$sortby} eq 'nan') {
1510: if ($a->{$sortby} ne 'nan') {
1511: $retvalue = -1;
1512: } else {
1513: $retvalue = 0;
1514: }
1515: }
1516: if ($a->{$sortby} eq 'nan') {
1517: if ($b->{$sortby} ne 'nan') {
1518: $retvalue = 1;
1519: }
1520: }
1521: if ($retvalue eq '0') {
1522: $retvalue = $b->{$sortby} <=> $a->{$sortby} ||
1523: lc($a->{'title'}) <=> lc($b->{'title'}) ||
1524: lc($a->{'part'}) <=> lc($b->{'part'});
1525: }
1526: $retvalue;
1527: } @StatsArray;
1.24 stredwic 1528: }
1529: }
1.45 matthew 1530: #
1.73 matthew 1531: # Renumber the data set
1532: my $count;
1533: foreach my $data (@StatsArray) {
1534: $data->{'problem_num'} = ++$count;
1535: }
1.24 stredwic 1536: return;
1.48 matthew 1537: }
1538:
1.70 matthew 1539: ########################################################
1540: ########################################################
1541:
1542: =pod
1543:
1544: =item &get_statistics()
1545:
1.117 bisitz 1546: Wrapper routine from the call to loncoursedata::get_problem_statistics.
1.73 matthew 1547: Calls lonstathelpers::get_time_limits() to limit the data set by time
1548: and &compute_discrimination_factor
1.70 matthew 1549:
1550: Inputs: $sequence, $resource, $part, $problem_num
1551:
1.117 bisitz 1552: Returns: Hash reference with statistics data from
1.70 matthew 1553: loncoursedata::get_problem_statistics.
1554:
1555: =cut
1556:
1557: ########################################################
1558: ########################################################
1.48 matthew 1559: sub get_statistics {
1.49 matthew 1560: my ($sequence,$resource,$part,$problem_num) = @_;
1.48 matthew 1561: #
1.70 matthew 1562: my ($starttime,$endtime) = &Apache::lonstathelpers::get_time_limits();
1.97 matthew 1563: my $symb = $resource->symb;
1.104 albertel 1564: my $courseid = $env{'request.course.id'};
1.48 matthew 1565: #
1.49 matthew 1566: my $data = &Apache::loncoursedata::get_problem_statistics
1.102 matthew 1567: ([&Apache::lonstatistics::get_selected_sections()],
1.108 raeburn 1568: [&Apache::lonstatistics::get_selected_groups()],
1.66 matthew 1569: $Apache::lonstatistics::enrollment_status,
1.70 matthew 1570: $symb,$part,$courseid,$starttime,$endtime);
1.85 matthew 1571: $data->{'symb'} = $symb;
1.49 matthew 1572: $data->{'part'} = $part;
1573: $data->{'problem_num'} = $problem_num;
1.97 matthew 1574: $data->{'container'} = $sequence->compTitle;
1575: $data->{'title'} = $resource->compTitle;
1576: $data->{'title.link'} = $resource->src.'?symb='.
1.109 www 1577: &escape($resource->symb);
1.49 matthew 1578: #
1.76 matthew 1579: if ($SelectedFields{'deg_of_disc'}) {
1.117 bisitz 1580: $data->{'deg_of_disc'} =
1.76 matthew 1581: &compute_discrimination_factor($resource,$part,$sequence);
1582: }
1.83 matthew 1583: #
1584: # Store in metadata if computations were done for all students
1.84 matthew 1585: if ($data->{'num_students'} > 1) {
1.102 matthew 1586: my @Sections = &Apache::lonstatistics::get_selected_sections();
1.84 matthew 1587: my $sections = '"'.join(' ',@Sections).'"';
1588: $sections =~ s/&+/_/g; # Ensure no special characters
1589: $data->{'sections'}=$sections;
1.104 albertel 1590: $data->{'course'} = $env{'request.course.id'};
1.97 matthew 1591: my $urlres=(&Apache::lonnet::decode_symb($resource->symb))[2];
1.84 matthew 1592: $data->{'urlres'}=$urlres;
1.117 bisitz 1593: my %storestats =
1.84 matthew 1594: &LONCAPA::lonmetadata::dynamic_metadata_storage($data);
1.117 bisitz 1595: my ($dom,$user) = ($urlres=~m{^($LONCAPA::domain_re)/($LONCAPA::username_re)});
1.83 matthew 1596: &Apache::lonnet::put('nohist_resevaldata',\%storestats,$dom,$user);
1597: }
1.85 matthew 1598: #
1.95 matthew 1599: $data->{'tries_per_correct'} = $data->{'tries'} /
1600: ($data->{'num_solved'}+0.1);
1601: #
1.85 matthew 1602: # Get the due date for research purposes (commented out most of the time)
1.112 raeburn 1603: # my $duedate = &Apache::lonnet::EXT('resource.'.$part.'.duedate',$symb);;
1604: # my $opendate = &Apache::lonnet::EXT('resource.'.$part.'.opendate',$symb);
1605: # my $maxtries = &Apache::lonnet::EXT('resource.'.$part.'.maxtries',$symb);
1606: # my $hinttries = &Apache::lonnet::EXT('resource.'.$part.'.hinttries',$symb);
1607: my $weight = &Apache::lonnet::EXT('resource.'.$part.'.weight',$symb);
1608: $data->{'weight'} = $weight;
1.117 bisitz 1609: # $data->{'duedate'} = $duedate;
1.112 raeburn 1610: # $data->{'opendate'} = $opendate;
1611: # $data->{'maxtries'} = $maxtries;
1612: # $data->{'hinttries'} = $hinttries;
1.86 matthew 1613: # $data->{'resptypes'} = join(',',@{$resource->{'partdata'}->{$part}->{'ResponseTypes'}});
1.49 matthew 1614: return $data;
1.71 matthew 1615: }
1616:
1617: ###############################################
1618: ###############################################
1619:
1620: =pod
1621:
1622: =item &compute_discrimination_factor()
1623:
1624: Inputs: $Resource, $Sequence
1625:
1626: Returns: integer between -1 and 1
1627:
1628: =cut
1629:
1630: ###############################################
1631: ###############################################
1632: sub compute_discrimination_factor {
1.97 matthew 1633: my ($resource,$part,$seq) = @_;
1634: my $symb = $resource->symb;
1.71 matthew 1635: my @Resources;
1.97 matthew 1636: foreach my $res (&Apache::lonstathelpers::get_resources($navmap,$seq)){
1637: next if ($res->symb eq $symb);
1638: push (@Resources,$res->symb);
1.71 matthew 1639: }
1640: #
1641: # rank
1.83 matthew 1642: my ($starttime,$endtime) = &Apache::lonstathelpers::get_time_limits();
1.117 bisitz 1643: my $ranking =
1.71 matthew 1644: &Apache::loncoursedata::rank_students_by_scores_on_resources
1645: (\@Resources,
1.102 matthew 1646: [&Apache::lonstatistics::get_selected_sections()],
1.108 raeburn 1647: [&Apache::lonstatistics::get_selected_groups()],
1.83 matthew 1648: $Apache::lonstatistics::enrollment_status,undef,
1.106 bowersj2 1649: $starttime,$endtime, $symb);
1.71 matthew 1650: #
1651: # compute their percent scores on the problems in the sequence,
1652: my $number_to_grab = int(scalar(@{$ranking})/4);
1653: my $num_students = scalar(@{$ranking});
1.117 bisitz 1654: my @BottomSet = map { $_->[&Apache::loncoursedata::RNK_student()];
1.71 matthew 1655: } @{$ranking}[0..$number_to_grab];
1.117 bisitz 1656: my @TopSet =
1657: map {
1658: $_->[&Apache::loncoursedata::RNK_student()];
1.106 bowersj2 1659: } @{$ranking}[-$number_to_grab..0];
1.91 matthew 1660: if (! @BottomSet || (@BottomSet == 1 && $BottomSet[0] eq '') ||
1661: ! @TopSet || (@TopSet == 1 && $TopSet[0] eq '')) {
1662: return 'nan';
1663: }
1.117 bisitz 1664: my ($bottom_sum,$bottom_max) =
1.97 matthew 1665: &Apache::loncoursedata::get_sum_of_scores($symb,$part,\@BottomSet,
1.83 matthew 1666: undef,$starttime,$endtime);
1.117 bisitz 1667: my ($top_sum,$top_max) =
1.97 matthew 1668: &Apache::loncoursedata::get_sum_of_scores($symb,$part,\@TopSet,
1.83 matthew 1669: undef,$starttime,$endtime);
1.71 matthew 1670: my $deg_of_disc;
1671: if ($top_max == 0 || $bottom_max==0) {
1672: $deg_of_disc = 'nan';
1673: } else {
1674: $deg_of_disc = ($top_sum/$top_max) - ($bottom_sum/$bottom_max);
1675: }
1676: #&Apache::lonnet::logthis(' '.$top_sum.'/'.$top_max.
1677: # ' - '.$bottom_sum.'/'.$bottom_max);
1678: return $deg_of_disc;
1.1 stredwic 1679: }
1.12 minaeibi 1680:
1.45 matthew 1681: ###############################################
1682: ###############################################
1.79 matthew 1683: ##
1684: ## Compute KR-21
1685: ##
1686: ## To compute KR-21, you need the following information:
1687: ##
1688: ## K=the number of items in your test
1689: ## M=the mean score on the test
1.117 bisitz 1690: ## s=the standard deviation of the scores on your test
1.79 matthew 1691: ##
1692: ## then:
1.117 bisitz 1693: ##
1.79 matthew 1694: ## KR-21 rk= [K/(K-1)] * [1- (M*(K-M))/(K*s^2))]
1695: ##
1696: ###############################################
1697: ###############################################
1698: sub compute_sequence_statistics {
1699: my ($seq) = @_;
1.97 matthew 1700: my $symb = $seq->symb;
1.79 matthew 1701: my @Resources;
1.97 matthew 1702: my $part_count;
1703: foreach my $res (&Apache::lonstathelpers::get_resources($navmap,$seq)) {
1704: push (@Resources,$res->symb);
1705: $part_count += scalar(@{$res->parts});
1.79 matthew 1706: }
1707: my ($starttime,$endtime) = &Apache::lonstathelpers::get_time_limits();
1708: #
1709: # First compute statistics based on student scores
1.117 bisitz 1710: my ($smin,$smax,$sMean,$sSTD,$scount,$sMAX) =
1.79 matthew 1711: &Apache::loncoursedata::score_stats
1.102 matthew 1712: ([&Apache::lonstatistics::get_selected_sections()],
1.108 raeburn 1713: [&Apache::lonstatistics::get_selected_groups()],
1.79 matthew 1714: $Apache::lonstatistics::enrollment_status,
1715: \@Resources,$starttime,$endtime,undef);
1.97 matthew 1716: $SeqStat{$symb}->{'title'} = $seq->compTitle;
1.79 matthew 1717: $SeqStat{$symb}->{'scoremax'} = $smax;
1718: $SeqStat{$symb}->{'scoremin'} = $smin;
1719: $SeqStat{$symb}->{'scoremean'} = $sMean;
1720: $SeqStat{$symb}->{'scorestd'} = $sSTD;
1721: $SeqStat{$symb}->{'scorecount'} = $scount;
1722: $SeqStat{$symb}->{'max_possible'} = $sMAX;
1723: #
1724: # Compute statistics based on the number of correct problems
1.117 bisitz 1725: # 'correct' is taken to mean
1.79 matthew 1726: my ($cmin,$cmax,$cMean,$cSTD,$ccount)=
1727: &Apache::loncoursedata::count_stats
1.102 matthew 1728: ([&Apache::lonstatistics::get_selected_sections()],
1.108 raeburn 1729: [&Apache::lonstatistics::get_selected_groups()],
1.79 matthew 1730: $Apache::lonstatistics::enrollment_status,
1731: \@Resources,$starttime,$endtime,undef);
1.97 matthew 1732: my $K = $part_count;
1.79 matthew 1733: my $kr_21;
1734: if ($K > 1 && $cSTD > 0) {
1735: $kr_21 = ($K/($K-1)) * (1 - $cMean*($K-$cMean)/($K*$cSTD**2));
1736: } else {
1737: $kr_21 = 'nan';
1738: }
1739: $SeqStat{$symb}->{'countmax'} = $cmax;
1740: $SeqStat{$symb}->{'countmin'} = $cmin;
1741: $SeqStat{$symb}->{'countstd'} = $cSTD;
1.82 matthew 1742: $SeqStat{$symb}->{'countmean'} = $cMean;
1.79 matthew 1743: $SeqStat{$symb}->{'count'} = $ccount;
1744: $SeqStat{$symb}->{'items'} = $K;
1745: $SeqStat{$symb}->{'KR-21'}=$kr_21;
1746: return;
1747: }
1748:
1749:
1.47 matthew 1750:
1751: =pod
1752:
1.73 matthew 1753: =item ProblemStatisticsLegend
1754:
1755: =over 4
1756:
1757: =item #Stdnts
1758: Total number of students attempted the problem.
1759:
1760: =item Tries
1761: Total number of tries for solving the problem.
1.59 matthew 1762:
1.73 matthew 1763: =item Max Tries
1764: Largest number of tries for solving the problem by a student.
1765:
1766: =item Mean
1767: Average number of tries. [ Tries / #Stdnts ]
1768:
1769: =item #YES
1770: Number of students solved the problem correctly.
1771:
1772: =item #yes
1773: Number of students solved the problem by override.
1774:
1775: =item %Wrong
1776: Percentage of students who tried to solve the problem
1777: but is still incorrect. [ 100*((#Stdnts-(#YES+#yes))/#Stdnts) ]
1778:
1779: =item DoDiff
1780: Degree of Difficulty of the problem.
1781: [ 1 - ((#YES+#yes) / Tries) ]
1782:
1783: =item S.D.
1784: Standard Deviation of the tries.
1785: [ sqrt(sum((Xi - Mean)^2)) / (#Stdnts-1)
1786: where Xi denotes every student\'s tries ]
1787:
1788: =item Skew.
1789: Skewness of the students tries.
1790: [(sqrt( sum((Xi - Mean)^3) / #Stdnts)) / (S.D.^3)]
1791:
1792: =item Dis.F.
1793: Discrimination Factor: A Standard for evaluating the
1794: problem according to a Criterion<br>
1795:
1796: =item [Criterion to group students into %27 Upper Students -
1797: and %27 Lower Students]
1798: 1st Criterion for Sorting the Students:
1799: Sum of Partial Credit Awarded / Total Number of Tries
1800: 2nd Criterion for Sorting the Students:
1801: Total number of Correct Answers / Total Number of Tries
1802:
1803: =item Disc.
1804: Number of Students had at least one discussion.
1805:
1806: =back
1.47 matthew 1807:
1808: =cut
1.73 matthew 1809:
1810: ############################################################
1811: ############################################################
1.4 minaeibi 1812:
1.1 stredwic 1813: 1;
1814: __END__
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