In this volume, Larry Toothaker provides the procedures that will enable researchers to establish the significance of differences between two comparable groups. Issues addressed include: planned versus post-hoc comparisons; step-by-step versus simultaneous test procedures; types of error ra])G unequal sample sizes and variances; and interaction tests versus cell mean tests. Examples are used to illustrate major concepts.

Violations of Assumptions and Robustness

When you first encounter multiple comparisons, it is natural to consider them as extensions of the ANOVA. Thus it is not surprising to find out that MCPs have the same assumptions as the ANOVA. Of course, the real-world applications of both ANOVA and MCPs do not exactly meet all of these assumptions. That is, it is ...

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