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A Note on the Standard Length of a Test

Published online by Cambridge University Press:  01 January 2025

Charles T. Myers
Charles T. Myers*
Affiliation:
Educational Testing Service
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Abstract

This paper describes a relationship between the variance-covariance matrix of test items and Woodbury's concept of the standard length of a test. An index of item-test relationship is described in standard length terms. The sum of these indices for the items in a test is equal to the square of Jackson's coefficient of sensitivity.

Type
Original Paper
Information
Psychometrika , Volume 26 , Issue 4 , December 1961 , pp. 443 - 446
Copyright
Copyright © 1961 The Psychometric Society

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References

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