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Webb, Mi-young Lee; Cohen, Allan S.; Schwanenflugel, Paula J. – Educational and Psychological Measurement, 2008
This study investigated the use of latent class analysis for the detection of differences in item functioning on the Peabody Picture Vocabulary Test-Third Edition (PPVT-III). A two-class solution for a latent class model appeared to be defined in part by ability because Class 1 was lower in ability than Class 2 on both the PPVT-III and the…
Descriptors: Item Response Theory, Test Items, Test Format, Cognitive Ability