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Test statistics of comparison of different IRT models.
| RSM | GPCM | GRM | |
|---|---|---|---|
| RSM | -14402.06 | ||
| GPCM | 1158.254∗∗ | -13822.93 | |
| GRM | 1319.515∗∗ | 161.261∗∗ | -13742.30 |
Notes: ∗∗p value ≤0.001; Main diagonal: log-likelihood values; Off-diagonal: chi-square test of model comparison.
