A Bayesian/IRT Index of Objective Performance IRT
- 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]