Hi,

Is there a way I can specify linear contrasts in glm? I'm looking for
something equivalent to SAS' contrast statement.

I'd like to do the following, suppose I have a categorical input with 4
levels (a,b,c,d), I'd like to test something like: (i)  a+b=c+d, (ii) a=b,
(iii) a=b+d, etc...

Thanks in advance for your help!

Leo.

	[[alternative HTML version deleted]]


