The purpose of this study was to investigate the performance of Beaton~{!/~}s MR and MSR fit indices for assessing goodness-of-fit of IRT models. These statistics are based on a standardized residual calculated from an expected and observed response. The investigation was conducted using a Monte...

This study evaluated the robustness of DIF detection for multidimensional polytomous items using two different estimation methods, MG-CFA and MGRM-DFIT. A simulation study across 960 study conditions was performed. The purpose of this study was to establish the Type-I error rate and Power of DIF...