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Direct linkPenfield, Randall D. – Applied Psychological Measurement, 2008
The examination of measurement invariance in polytomous items is complicated by the possibility that the magnitude and sign of lack of invariance may vary across the steps underlying the set of polytomous response options, a concept referred to as differential step functioning (DSF). This article describes three classes of nonparametric DSF effect…
Descriptors: Simulation, Nonparametric Statistics, Item Response Theory, Computation
