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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
Catts, Ralph – 1978
The reliability of multiple choice tests--containing different numbers of response options--was investigated for 260 students enrolled in technical college economics courses. Four test forms, constructed from previously used four-option items, were administered, consisting of (1) 60 two-option items--two distractors randomly discarded; (2) 40…
Descriptors: Answer Sheets, Difficulty Level, Foreign Countries, Higher Education
