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A Gentle Introduction to Statistics Using SAS Studio in the Cloud
book

A Gentle Introduction to Statistics Using SAS Studio in the Cloud

by Ron Cody
May 2021
Beginner content levelBeginner
306 pages
6h 20m
English
SAS Institute
Content preview from A Gentle Introduction to Statistics Using SAS Studio in the Cloud

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 ...

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Publisher Resources

ISBN: 9781954844476