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Test-level model fit for four polytomous scored IRT models.
| Model | −2LL | AIC | BIC |
|---|---|---|---|
| GRM | 114,102.7 | 114,590.7 | 115,813.4 |
| GPCM | 114,551.4 | 115,039.4 | 116,262.1 |
| RSM | 121,146.8 | 121,274.8 | 121,595.5 |
| GRSM | 116,305.7 | 116,553.7 | 117,175.1 |
−2LL = −2log-likelihood; AIC = Akaike information criterion; BIC = Bayesian information criterion; GRM = Graded Response Model; GPCM = Generalized Partial Credit Model; RSM = Rating Scale Model; GRSM = Generalized Rating Scale Model.
