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Peer reviewedLee, Guemin; Kolen, Michael J.; Frisbie, David A.; Ankenmann, Robert D. – Applied Psychological Measurement, 2001
Compared performance of two polytomous item response theory models to that of the dichotomous three-parameter logistic model in equating tests composed of testlets using data from 6 tests of the Iowa Tests of Basic Skills (samples of 537 to 680 eighth graders). Results of the equating method based on polytomous models produced results that more…
Descriptors: Equated Scores, Item Response Theory, Junior High School Students, Junior High Schools
Direct linkTong, Ye; Kolen, Michael – Applied Psychological Measurement, 2005
The performance of three equating methods--the presmoothed equipercentile method, the item response theory (IRT) true score method, and the IRT observed score method--were examined based on three equating criteria: the same distributions property, the first-order equity property, and the second-order equity property. The magnitude of the…
Descriptors: True Scores, Criteria, Raw Scores, Item Response Theory
