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A More Powerful Post Hoc Multiple Comparison Procedure in Analysis of Variance
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A More Powerful Post Hoc Multiple Comparison Procedure in Analysis of Variance
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Journal Article
A More Powerful Post Hoc Multiple Comparison Procedure in Analysis of Variance
1998
Overview
Scheffé's test (Scheffé, 1953), which is commonly used to conduct post hoc contrasts among k group means, is unnecessarily conservative because it guards against an infinite number of potential post hoc contrasts when only a small set would ever be of interest to a researcher. This paper identifies a set of post hoc contrasts based on subsets of the treatment groups and simulates critical values from the appropriate multivariate F-distribution to be used in place of those associated with Scheffé's test. The proposed method and its critical values provide a uniformly more powerful post hoc procedure.
Publisher
American Educational Research Association and American Statistical Association
