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Relative Costs and Statistical Power in the Extreme Groups Approach

Published online by Cambridge University Press:  01 January 2025

Norman M. Abrahams  and
Edward F. Alf Jr.
Norman M. Abrahams*
Affiliation:
Navy Personnel Research and Development Center
Edward F. Alf Jr.
Affiliation:
Navy Personnel Research and Development Center
*
Requests for reprints should be sent to Norman M. Abrahams, Navy Personnel Research and Development Center, San Diego, CA 92152.
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Abstract

The relationship between variables in applied and experimental research is often investigated by the use of extreme (i.e., upper and lower) groups. Recent analytical work has provided an extreme groups procedure that is more powerful than the standard correlational approach for all values of the correlation and extreme group size. The present article provides procedures to optimize power by determining the relative number of subjects to use in each of two stages of data collection given a fixed testing budget.

Keywords

costspoweroptimization
Type
Original Paper
Information
Psychometrika , Volume 43 , Issue 1 , March 1978 , pp. 11 - 17
Copyright
Copyright © 1978 The Psychometric Society

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Footnotes

The opinions or assertions contained herein are those of the writers and are not to be construed as official or reflecting the views of the Navy Department.

Edward F. Alf, Jr. is also affiliated with the Department of Psychology, San Diego State University.

References

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