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A Note on the Estimation of Test Reliability by the Kuder-Richardson Formula (20)

Published online by Cambridge University Press:  01 January 2025

Ledyard R Tucker
Ledyard R Tucker*
Affiliation:
Educational Testing Service
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Abstract

The Kuder-Richardson formula (20) is rewritten to be identical with the simplest formula, (21), except for the addition of a term involving the standard deviation, σp, of the item p's. If σp can be estimated, a rapid and superior estimate of test reliability is possible in contrast to the simpler formula (21) used when the number of items and mean and standard deviation of test scores are known.

Type
Original Paper
Information
Psychometrika , Volume 14 , Issue 2 , June 1949 , pp. 117 - 119
Copyright
Copyright © 1949 The Psychometric Society

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Footnotes

*

Kuder, G. F. and Richardson, M. W. The theory of the estimation of test reliability. Psychometrika. 1937, 2, 151–160.