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A Bayesian/IRT Index of Objective Performance

Author(s):
Yen, Wendy M.
Publication Year:
1987
Report Number:
OPI-1987
Source:
Annual Meeting of the Psychometric Society, Jun 1987
Document Type:
Paper
Page Count:
24
Subject/Key Words:
Bayesian Methods Item Response Theory (IRT) Objective Scoring

Abstract

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. [Author abstract; reproduced with permission of CTB/McGraw-Hill LLC. Copyright 1987 by CTB McGraw-Hill LLC. All rights reserved]

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