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Time-Limit Tests: Estimating their Reliability and Degree of Speeding

Published online by Cambridge University Press:  01 January 2025

Lee J. Cronbach  and
W. G. Warrington
Lee J. Cronbach
Affiliation:
University of Illinois
W. G. Warrington
Affiliation:
University of Illinois
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Abstract

Non-spurious methods are needed for estimating the coefficient of equivalence for speeded tests from single-trial data. Spuriousness in a split-half estimate depends on three conditions; the split-half method may be used if any of these is demonstrated to be absent. A lower-bounds formula, rc, is developed. An empirical trial of this coefficient and other bounds proposed by Gulliksen demonstrates that, for moderately speeded tests, the coefficient of equivalence can be determined approximately from single-trial data. It is proposed that the degree to which tests are speeded be investigated explicitly, and an index τ is advanced to define this concept.

Type
Original Paper
Information
Psychometrika , Volume 16 , Issue 2 , June 1951 , pp. 167 - 188
Copyright
Copyright © 1951 The Psychometric Society

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