Unbiased Estimators of Ability Parameters, of Their Variance, and of Their Parallel-Forms Reliability [microform] / Frederic M. Lord
- Bib ID:
- 5411987
- Format:
- Book and Microform
- Author:
- Lord, Frederic M
- Online Version:
- https://eric.ed.gov/?id=ED216013
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- Description:
-
- [Washington, D.C.] : Distributed by ERIC Clearinghouse, 1981
- 42 p.
- Summary:
-
This paper is primarily concerned with determining the statistical bias in the maximum likelihood estimate of the examinee ability parameter in item response theory, and of certain functions of such parameters. Given known item parameters, unbiased estimators are derived for (1) an examinee's ability parameter and proportion-correct true score; (2) the variance of ability parameters across examinees in the group tested, and the variance of proportion-correct true scores; and (3) the parallel-forms reliability of the observed test score, the maximum likelihood estimator. These formulas apply in situations where the item parameters are known; they are not adequate for situations where the item parameters and ability parameters are estimated simultaneously from a single data set. (Author/BW)
- Notes:
-
- Sponsoring Agency: Office of Naval Research, Arlington, VA. Personnel and Training Research Programs Office.
- Contract Number: N00014-80-C-0402.
- May also be available online. Address as at 14/8/18: https://eric.ed.gov/
- Reproduction:
- Microfiche. [Washington D.C.]: ERIC Clearinghouse microfiches : positive.
- Subject:
- Other authors/contributors:
- Educational Testing Service, Princeton, NJ
- Available From:
- ERIC
- Copyright:
-
In Copyright
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Copyright status was determined using the following information:
- Material type:
- Literary Dramatic Musical
- Published status:
- Published
- Publication date:
- 1981
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