Table 1.
Fit of data to the Rasch model.
| Item | Person | Chi Square Interaction | PSI | Unidimensional t-tests (Confidence intervals) |
||||
| Analysisμ | Mean | SD | Mean | SD | Value (df) |
p | ||
| 1 | 0.102 | 3.111 | -0.533 | 1.730 | 312.1 (126) |
0.000 | 0.906 | 11.68% (10–13%) |
| 2 | 0.102 | 2.084 | -0.504 | 1.555 | 178.9 (99) |
0.000 | 0.879 | 9.15% (8–11%) |
| 3 | 0.143 | 1.580 | -0.491 | 1.448 | 114.2 (85) |
0.009 | 0.872 | 7.03% (6–9%) |
| 4 | 0.080 | 1.794 | -0.472 | 1.295 | 87.19 (63) |
0.023 | 0.840 | 4.17%* |
| 5 | 0.065 | 1.341 | -0.475 | 1.222 | 64.70 (54) |
0.151 | 0.845 | 4.18%* |
| 6 | 0.126 | 0.681 | -0.472 | 1.223 | 41.1 (54) |
0.901 | 0.837 | 4.77%* |
| 7 | 0.113 | 1.436 | -0.437 | 1.194 | 56.5 (54) |
0.382 | 0.854 | 5.15% (3–7%) |
| 8 | 0.078 | 2.036 | -0.540 | 1.743 | 208.7 (126) |
0.000 | 0.903 | 11.77% (10–13%) |
| 9 | 0.262 | 2.372 | -0.472 | 1.656 | 233.3 (126) |
0.000 | 0.910 | 10.67% (9–12%) |
* Confidence intervals not relevant where values are <5%
μKey to analysis
1 14 items
2 11 items
3 9 items
4 7 items
5 7 items DIF cancelled
6 Analysis 5 tested on sample 1
7 Analysis 5 tested on sample 2
8 14 items males
9 14 items females