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Direct linkFukuhara, Hirotaka; Kamata, Akihito – Applied Psychological Measurement, 2011
A differential item functioning (DIF) detection method for testlet-based data was proposed and evaluated in this study. The proposed DIF model is an extension of a bifactor multidimensional item response theory (MIRT) model for testlets. Unlike traditional item response theory (IRT) DIF models, the proposed model takes testlet effects into…
Descriptors: Item Response Theory, Test Bias, Test Items, Bayesian Statistics
