Hi everyone,

I'm trying to estimate odds ratios in proc genmod, and don't
understand how to choose the effect values in the 'estimate'
statement.  In the below code, using the effects values -1 and 1 seems
to produce the odds ratio I want that compares the effect of
finaldef=1 versus finaldef=0.  (finaldef just has values 0 and 1).
Can anyone explain how these effect values work?  How do you choose
effects for a variable with more than two levels?

Thanks for your help!

proc genmod data=analysis descending;
	class finaldef(ref='0') trend(ref='0')  baseid;
	model crum= finaldef trend / dist=binomial link=logit;
	repeated subject=baseid/ type=exch;
	estimate "Finaldef" finaldef -1 1/exp;
	run;