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Testing treatment effects in repeated measures designs: An update for psychophysiological researchers

Published online by Cambridge University Press:  01 July 1998

H. J. Keselman
H. J. Keselman
Affiliation:
Department of Psychology, University of Manitoba, Winnipeg, Canada
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Abstract

In 1987, Jennings enumerated data analysis procedures that authors must follow for analyzing effects in repeated measures designs when submitting papers to Psychophysiology. These prescriptions were intended to counteract the effects of nonspherical data, a condition know to produce biased tests of significance. Since this editorial policy was established, additional refinements to the analysis of these designs have appeared in print in a number of sources that are not likely to be routinely read by psychophysiological researchers. Accordingly, this paper includes additional procedures not previously enumerated in the editorial policy that can be used to analyze repeated measurements. Furthermore, I indicate how numerical solutions can easily be obtained.

Keywords

Repeated measurementsMaininteractionand contrast testsNew analyses
Type
METHODOLOGY
Information
Psychophysiology , Volume 35 , Issue 4 , July 1998 , pp. 470 - 478
Copyright
© 1998 Society for Psychophysiological Research

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Footnotes

Address reprint requests to: H. J. Keselman, Department of Psychology, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada.