[R] Pairwise T-Tests and Dunnett's Test (possibly using multcomp)

From: Paul Miller <pjmiller_57_at_yahoo.com>
Date: Tue, 01 Mar 2011 15:45:31 -0800 (PST)

Hello Everyone,

Figured out one part of the code. Setting the reference level for a factor is accomplished using the relevel funtion (pg. 383 of MASS; pg. 70 of Data Manipulation with R):

gad$dosegrp <- relevel(gad$dosegrp,3)

This works very well. Much better than using a format in SAS procedures that don't allow the "ref=" option for instance.


Does anyone have suggestions about how to improve other aspects of my code?



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