Unbiased Estimators of Ability Parameters, of their Variance, and of their Parallel-Forms Reliability.

Lord, Frederic M.

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Peer reviewed

ERIC Number: EJ290771

Record Type: Journal

Publication Date: 1983

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Unbiased Estimators of Ability Parameters, of their Variance, and of their Parallel-Forms Reliability.

Lord, Frederic M.

Psychometrika, v48 n2 p233-45 Jun 1983

Given known item parameters for a test, unbiased estimators are derived for an examinee's ability parameter, his or her proportion correct true score for the variances of these parameters and for the parallel forms reliability of the maximum likelihood estimator of the ability parameter. (Author/JKS)

Descriptors: Error of Measurement, Estimation (Mathematics), Item Analysis, Latent Trait Theory, Maximum Likelihood Statistics, Test Reliability, True Scores

Publication Type: Reports - Research; Journal Articles

Education Level: N/A

Audience: N/A

Language: English

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