Example 8.9: Contrasts

October 12, 2010
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(This article was first published on SAS and R, and kindly contributed to R-bloggers)

In example 8.6 we showed how to change the reference category. This is the natural first thought analysts have when their primary comparisons aren’t represented in the default output. But our interest might center on a number of comparisons which don’t share a category. Or we might need to compare one group with the mean of the other groups. Today we’ll explore tests and estimates of effects

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