Multiple Comparison Procedures
In the previous chapter we presented several different procedures for comparing more than two groups with regard to some aspect of location. The major part of the chapter focused on the oneway analysis of variance (ANOVA) for testing hypotheses about population means. We also described the Kruskal-Wallis procedure as a non-parametric alternative to ANOVA when the assumptions may be of concern. We then discussed some resampling approaches to the problem of comparing more than two groups, and concluded by mentioning the comparison of several groups with respect to proportions. Comparing several groups with regard to variances was treated previously (e.g., Levene’s test, see Chapter 15).