![]() My vague recollection is that the context is that these are stimulants and the dependent measure is some measure of alertness. The within-subjects part of the study is a 3 x 3 design with three different types of drugs given at three different dosages. The data, which can be found in wide format in elashoff.xls, is a “famous” data set that has appeared in numerous textbooks from Elashoff (1981) “Data for the panel session in software for repeated measures analysis of variance.” It is actually a mixed design (there’s a between-subjects variable), but I’m going to ignore the between-subjects for now in the name of pedagogy. This post will cover a simple two-way repeated-measures ANOVA, so it won’t be all that bad, but even here there will start to be a few complications in places. ![]() This becomes increasingly true as the designs become more complicated. ![]() As I noted in the last blog post, R is not terribly well-situated for repeated measures. ![]()
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