A Bayesian/IRT Index of Objective Performance

Yen, Wendy M.
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Score reports objective scores achievement tests IRT


This paper presents a combination Bayesian/item response theory procedure for pooling performance on a particular objective with information about an examinee’s overall test performance in order to produce more stable objective scores. The procedure, including the calculation of a posterior distribution, is described. A split-half cross validation study finds that a credibility interval based on the posterior distribution is sufficiently accurate to be useful for scoring reports for teachers. Reproduced with permission of CTB/McGraw-Hill LLC. Copyright © 1987 by CTB/McGraw-Hill LLC. All right reserved.

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