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Download full textYu, Lei; Moses, Tim; Puhan, Gautam; Dorans, Neil – ETS Research Report Series, 2008
All differential item functioning (DIF) methods require at least a moderate sample size for effective DIF detection. Samples that are less than 200 pose a challenge for DIF analysis. Smoothing can improve upon the estimation of the population distribution by preserving major features of an observed frequency distribution while eliminating the…
Descriptors: Test Bias, Item Response Theory, Sample Size, Evaluation Criteria
