9
Comparing More Than Two Means (ANOVA)
Introduction
When you want to compare means in a study where there are three or more groups, you cannot use multiple t tests. In the old days (even before my time!), if you had three groups (let’s call them A, B, and C), you might perform t tests between each pair of means (A versus B, A versus C, and B versus C). With four groups, the situation gets more complicated; you would need six t tests (A versus B, A versus C, A versus D, B versus C, B versus D, and C versus D). Even though no one does multiple t tests anymore, it is important to understand the underlying reason why this is not statistically sound.
Suppose you are comparing four groups and performing six t tests. Also, suppose that the null hypothesis ...
Get A Gentle Introduction to Statistics Using SAS Studio in the Cloud now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
