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Analysis of Variance Designs by A. J. Guarino, Lawrence S. Meyers, Glenn Gamst

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Chapter Seven Multiple Comparison Procedures

7.1 Overview

Once we have determined that an independent variable has yielded a significant effect, we must next turn our attention to the differences between the means of the conditions in the study. If there are only two means, then we automatically know that they are significantly different. With three or more means a significant F ratio reveals only that there is a difference between at least one pair of means in the design; in this case we must perform an additional, post-ANOVA multiple comparison procedure to determine which of the three or more means differ from which others.

There are a variety of multiple comparison procedures that are available to researchers. Before presenting them, we will ...

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