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.
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