5.1. Introduction

In many experiments, several treatments are applied to the same experimental unit at different time points, or only a single treatment is applied to a subject but the measurements on the same characteristic or set of characteristics are taken on more than one occasion. The data collected under these or similar kinds of experimental setups are often referred to as repeated measures data and require extra care in their analyses.

A common reason for taking repeated measures on the same subject in many biological, medical, psychological, and sociological experiments is the fact that there is usually more variability in the measurements between the subjects than within a given subject. Thus, to control the variability, subjects ...

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