A Note on the Reliability Coefficients for Item Response Model-Based Ability Estimates
- Title
- A Note on the Reliability Coefficients for Item Response Model-Based Ability Estimates
- Author
- 김성훈
- Keywords
- reliability coefficient; ability estimates; item response theory
- Issue Date
- 2012-01
- Publisher
- SPRINGER, 233 SPRING ST, NEW YORK, NY 10013 USA
- Citation
- PSYCHOMETRIKA, 권: 77, 호: 1, 페이지: 153-162
- Abstract
- Assuming item parameters on a test are known constants, the reliability coefficient for item response theory (IRT) ability estimates is defined for a population of examinees in two different ways: as (a) the product-moment correlation between ability estimates on two parallel forms of a test and (b) the squared correlation between the true abilities and estimates. Due to the bias of IRT ability estimates, the parallel-forms reliability coefficient is not generally equal to the squared-correlation reliability coefficient. It is shown algebraically that the parallel-forms reliability coefficient is expected to be greater than the squared-correlation reliability coefficient, but the difference would be negligible in a practical sense.
- URI
- http://search.proquest.com/docview/912432852?accountid=11283https://link.springer.com/article/10.1007%2Fs11336-011-9238-0
- ISSN
- 0033-3123
- DOI
- 10.1007/s11336-011-9238-0
- Appears in Collections:
- COLLEGE OF EDUCATION[S](사범대학) > EDUCATION(교육학과) > Articles
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