PARTIALLY OBSERVED MIXTURES OF IRT MODELS: AN EXTENSION OF THE GENERALIZED PARTIAL CREDIT MODEL

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Investigation of model fit and score scale comparability in international assessments (2011, methodology): “Findings from the study conducted by von Davier and Yamamoto (2004) suggest that rather than constraining all item parameters to be equal across the three subpopulations examined in their study, to accommodate empirical evidence that some items function differently in the components of the…”
Fitting a Mixture Item Response Theory Model to Personality Questionnaire Data: Characterizing Latent Classes and Investigating Possibilities for Improving Prediction (2008, methodology): “A method commonly used to link IRT scales is to impose equality constraints on item parameters across latent classes for a subset of items (e.g., Kelderman & Macready, 1990; Kolen & Brennan, 1995; Von Davier & Yamamoto, 2004).”