Table 35
Table 35.1-5 - plots for the entire sample or for the accumulated sub-samples selected by PSUBTOTAL=
Table 35.11-15, 35.21-25, ... - plots for sub-samples selected by PSUBTOTAL=
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x-axis: "Average of two person measures" = average of the ability measures for each pair of two persons.
plotted values: 1-9 are counts of pairs at the x,y coordinates. * is more than 9 pairs.
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Table 35.1, 35.11, 35.21, ...
% SAME (PAIRED STUDENT) OBSERVED RESPONSES
-4 -2 0 2 4 6
+-------+-------+-------+-------+-------+
100%| 1 |
| |
90%| |
| 1 |
80%| 11 1 |
| 1 |
70%| 2 2 |
| 1 1 21 1 1 |
60%| 1 1 13 1 |
| 11 2 4111 1 2 21 2 |
50%| 1 1212 22224 1 1 11 |
| 232111 142 1 1 1 |
40%| 23 1121 |
| 1 1 11 11 |
30%| 1 21 1 |
| 1 1 1 1 11 |
20%| 1 |
| |
10%| |
| |
0%| 1 |
+-------+-------+-------+-------+-------+
-4 -2 0 2 4 6
AVERAGE OF THE TWO STUDENT MEASURES
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Table 35.1, 35.11, 35.21, ...
y-axis: "% Same (paired student) observed responses" = the count of items for which both persons have the same response code in CODES= divided by the count of items for which both persons have a non-missing response %.
Cheating detection: shared responses. For cheating-detection, see www.rasch.org/rmt/rmt61d.htm
In the plot, "1" indicates that 1 pair are plotted at this point. "2" indicates 2 pairs. "4" indicates 4 pairs, and so on up to "9". When there are 10 or more pairs at a point, "*" is plotted.
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Table 35.2, 35.12, 35.22, ...
% SAME (PAIRED STUDENT) SCORED RESPONSES
-4 -2 0 2 4 6
+-------+-------+-------+-------+-------+
100%| 1 1 |
| |
90%| 1 |
| 1 1 1 |
80%| 11 1 |
| 1 133 |
70%| 1 1 11441 1 2 |
| 1 1 112 2111 2 1 |
60%| 114112121 2 |
| 1111 221 1 1 21 2 |
50%| 1 1 34 11114 11 |
| 1 1 1 1 1 |
40%| 1 1 |
| 1 1 11 |
30%| 1 |
| 1 1 11 |
20%| |
| |
10%| |
| |
0%| 1 |
+-------+-------+-------+-------+-------+
-4 -2 0 2 4 6
AVERAGE OF THE TWO STUDENT MEASURES
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Table 35.2, 35.12, 35.22, ...
y-axis: "% Same (paired student) scored responses" = the count of items for which both persons have the same score divided by the count of items for which both persons have a non-missing response %.
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Table 35.3, 35.13, 35.23, ...
% SAME (PAIRED STUDENT) OBSERVED HIGHEST (RIGHT) RESPONSES
-4 -2 0 2 4 6
+-------+-------+-------+-------+-------+
100%| 1 1 |
| |
90%| |
| 1 |
80%| 1 1 |
| 1 1 |
70%| 1 1 2 |
| 1 2 1 |
60%| 322 2 |
| 1 2 231 1 1 11 2 |
50%| 1 21211111 2 1 11 |
| 14111121 1 |
40%| 1113 1231 1 1 |
| 1 1121 121 2 1 |
30%| 1 1 1 |
| 1 11121 |
20%| 1 111 |
| 1 |
10%| |
| |
0%| 211 |
+-------+-------+-------+-------+-------+
-4 -2 0 2 4 6
AVERAGE OF THE TWO STUDENT MEASURES
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Table 35.3, 35.13, 35.23, ...
y-axis: "% Same (paired student) observed highest (right) responses" = the count of items for which both persons have the same highest scored response divided by the count of items for which one or both persons have a highest scored response %.
Cheating detection: shared knowledge
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Table 35.4, 35.14, 35.24, ...
% SAME (PAIRED STUDENT) OBSERVED LOWEST (WRONG) RESPONSES
-4 -2 0 2 4 6
+-------+-------+-------+-------+-------+
100%| |
| |
90%| |
| |
80%| |
| |
70%| |
| 1 |
60%| 1 1 11 |
| |
50%| 1 |
| 1 2 1 |
40%| 1 1 1 |
| 1 2 1 323 |
30%| 1 11311 |
| 1412 41 21 1 |
20%| 1 122121224 |
| 1 1 1 151 1 21 4 1 |
10%| 11 11 |
| 1 |
0%| 1 1 11 1 111111 11124 2 |
+-------+-------+-------+-------+-------+
-4 -2 0 2 4 6
AVERAGE OF THE TWO STUDENT MEASURES
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Table 35.4, 35.14, 35.24, ...
y-axis: "% Same (paired student) observed lowest (wrong) responses" = the count of items for which both persons have the same lowest scored response divided by the count of items for which one or both persons have a lowest scored response %.
Cheating detection: shared ignorance - a better indication of cheating than shared knowledge.
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Table 35.5, 35.15, 35.25, ...
% SAME (PAIRED STUDENT) MISSING RESPONSES
-4 -2 0 2 4 6
+-------+-------+-------+-------+-------+
100%| |
| |
90%| 1 |
| 1 2 2 |
80%| 1 1 |
| 1 11 11 1 1 |
70%| 1 11 1 1 2 1 |
| 11 3331 421 11 1 21 |
60%| 125 1222 1 11 |
| 111 21231 55 1 1 1 |
50%| 1 1 3421 1 |
| 1 11 1 1 |
40%| 1 2 |
| 11 |
30%| |
| 1 |
20%| |
| |
10%| |
| |
0%| |
+-------+-------+-------+-------+-------+
-4 -2 0 2 4 6
AVERAGE OF THE TWO STUDENT MEASURES
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Table 35.5, 35.15, 35.25, ...
This Table is only output when there are missing observations in the data.
y-axis: "% Same (paired student) missing responses" = the count of items for which both persons have a missing response divided by the count of items for which one or both persons have a missing response %.
Pairs of students near the top of the plot responded to almost the same items.
CAT testing: to detect test overlap, which we want to minimize in order avoid item over-exposure and "tracking" through the item bank.
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