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Estimation of Error Variances of Test Scores

Published online by Cambridge University Press:  01 January 2025

John A. Keats
John A. Keats*
Affiliation:
Educational Testing Service
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Abstract

The representation of test scores as n-dimensional points leads directly to an estimate of error variance at a particular score level in the case of equivalent items. Approximations are suggested for the case of non-equivalent items. These approximations are compared, with satisfactory results, with empirical data prepared by Dr. Mollenkopf.

Type
Original Paper
Information
Psychometrika , Volume 22 , Issue 1 , March 1957 , pp. 29 - 41
Copyright
Copyright © 1957 The Psychometric Society

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References

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