Table 4 Rasch summary statistics of expert ratings
Difficulty | Infit | Outfit | PTMEA | |
|---|---|---|---|---|
Rating criterion | ||||
Content | 0.38 (0.08) | 1.06 | 1.05 | .70 |
Organization | 0.85 (0.08) | 1.02 | 0.97 | .70 |
Vocabulary | − 0.09 (0.08) | 1.02 | 1.07 | .57 |
Language use | − 0.33 (0.08) | 0.89 | 0.90 | .66 |
Halo index | ||||
Separation ratio | 6.64 | |||
Separation index (Strata) | 9.18 | |||
Reliability of trait separation | .98 | |||
Fixed-effect (all same) chi-square statistic | 133.5 (df = 3, p < .001) | |||