We need to run a pairwise comparison in proc mixed but haven't been able to figure out how to do this because the variables are continuous. Please help.
I don't understand your question. When you have a categorical fixed-effect, you can ask whether the mean response for one level of the categorical effect is different than for another level. A pairwise comparison tests whether the difference of means is significant. The idea is analogous to a two-sample t-test for univariate data.
Can you describe your data and the hypothesis you are trying to test?
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ANOVA, or Analysis Of Variance, is used to compare the averages or means of two or more populations to better understand how they differ. Watch this tutorial for more.