The Analysis of Repeated Measures Data

Abstract

The multivariate data sets considered in previous chapters have involved measurements or observations on a number of different variables for each object or individual in the study. In this chapter, however, we will consider multivariate data of a different nature, namely data resulting from the repeated measurements of the same variable on each unit in the data set. Examples of such data are common in many disciplines. But before we introduce some actual repeated measures data sets, we need to make a small digression in order to introduce the two different “formats”, the wide and the long forms, in which such data are commonly stored and dealt with.