ABSTRACT
In this chapter you will:
Learn about repeated measures or within-subjects factors.
Learn about studies that include within-subjects factors and when they should be used.
Learn how to analyze data from a single-factor within-subjects study.
The statistical procedures discussed in the previous chapters are appropriate for assessing either the effect of a single factor on a dependent measure of interest or the effects of multiple factors (their main effects and interactions) combined in a completely crossed design. A restriction has been that factors must operate between subjects; that is, subjects may contribute one, and only one, score to the analysis. Thus, for these between-subjects studies, no subject is represented at more than one level of any factor. In other words, each subject appears in exactly one group or cell of the study.