[R] contrasts for lm

From: Ann Hess <hess_at_stat.colostate.edu>
Date: Thu 08 Dec 2005 - 10:52:35 EST

I would like estimate a number of contrasts from a one-way ANOVA model. I see that the lm command has a contrasts option, but I can't figure out how to use it! Any help that can be offered would be greatly apreciated.

Here is my model statement:

Model<-lm(log2PM~P+T+P*T)

where P has 16 levels, T(treatment) has 12 levels and I am interested in looking at different treatment comparisons.

Thanks!

Ann



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