What question did this study set out to answer?

The aim is to explore the validity issues associated with repeated measures ANOVA and propose a multivariate solution.

July 1, 1987

The Continuing Problem of False Positives in Repeated Measures ANOVA in Psychophysiology: A Multivariate Solution

Key Points

The aim is to explore the validity issues associated with repeated measures ANOVA and propose a multivariate solution.
Discussion of validity assumptions for overall and sub-effect tests.
Presentation of a multivariate approach for exact analysis.
Introduction of a modification to the traditional univariate method.
The multivariate approach significantly reduces validity concerns compared to traditional methods.
The proposed methods show less positive bias in tests involving simple interactions and multiple comparisons.

Abstract

ABSTRACT Violation of the validity assumptions of repeated measures analysis of variance continues to be a problem in psychophysiology. Such violation results in positive bias for those tests involving the repeated measures factor(s), Recently it has been shown that the tests of simple interactions and multiple comparisons are even more vulnerable to bias (Boik. 1981; Mitzel & Games, 1981). The present paper offers a discussion of the validity assumptions for both overall and sub‐effect tests and describes a multivariate approach which allows exact analysis of such designs. A modification of the univariate approach is also described. Validity concerns for both approaches are much less problematic than those of the traditional approach.

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The Continuing Problem of False Positives in Repeated Measures ANOVA in Psychophysiology: A Multivariate Solution

Key Points

Abstract

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