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Direct linkLee, Jihyun; Paek, Insu – Journal of Psychoeducational Assessment, 2014
Likert-type rating scales are still the most widely used method when measuring psychoeducational constructs. The present study investigates a long-standing issue of identifying the optimal number of response categories. A special emphasis is given to categorical data, which were generated by the Item Response Theory (IRT) Graded-Response Modeling…
Descriptors: Likert Scales, Responses, Item Response Theory, Classification
Download full textLee, Yi-Hsuan; Zhang, Jinming – ETS Research Report Series, 2010
This report examines the consequences of differential item functioning (DIF) using simulated data. Its impact on total score, item response theory (IRT) ability estimate, and test reliability was evaluated in various testing scenarios created by manipulating the following four factors: test length, percentage of DIF items per form, sample sizes of…
Descriptors: Test Bias, Item Response Theory, Test Items, Scores
