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Direct linkWoods, Carol M.; Cai, Li; Wang, Mian – Educational and Psychological Measurement, 2013
Differential item functioning (DIF) occurs when the probability of responding in a particular category to an item differs for members of different groups who are matched on the construct being measured. The identification of DIF is important for valid measurement. This research evaluates an improved version of Lord's X[superscript 2] Wald test for…
Descriptors: Test Bias, Item Response Theory, Computation, Comparative Analysis
Cai, Li; Lee, Taehun – Multivariate Behavioral Research, 2009
We apply the Supplemented EM algorithm (Meng & Rubin, 1991) to address a chronic problem with the "two-stage" fitting of covariance structure models in the presence of ignorable missing data: the lack of an asymptotically chi-square distributed goodness-of-fit statistic. We show that the Supplemented EM algorithm provides a…
Descriptors: Aggression, Simulation, Factor Analysis, Goodness of Fit
