I am new at working with contrasts. I was interested in resources to learn how to create contrasts. Also, I need help with one of my analyses - I have 3 factors: a (high and low), b (red and white), c (small, medium, large). I need to create contrasts for the main effect of the three level factor to compare small vs. medium, small vs. large and medium vs. small and also two-way interactions between factors. How would those contrasts look like, I am getting hung up on it. proc glimmix data=test; class a b c; model outcome=a b c a*b a*c b*c / dist=normal; lsmeans a b c; lsmeans a*b a*c b*c; contrast ..... Thanks, M
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