Contrasts are an efficient, powerful method for comparing exactly the groups that you want to compare, using whatever contrast weights that you require. However, there are times when you do not have, or do not need, such specific comparisons. The One-Way ANOVA procedure allows you to compare every group mean against every other, a method known as pairwise multiple comparisons.

A sales manager has analyzed training data using One-Way ANOVA. While significant group differences were found, there are no prior hypotheses about how the three groups should differ. Therefore, he has decided to simply compare every group to every other group.

This example uses the file salesperformance.sav.