Hi Freesurfer experts, I'm very sorry to bother you, but I am very confused with the following questions:
My experimental design includes two discrete factors: genotype with three levels (GG,GA,AA ); gender (F, M), and one covariate. So I can get 6 classes: MGG, MGA,MAA, FGG,FGA,FAA. 1) I want to perform the difference between any of the genotype leves analysis with regressing out the effect of gender and one covariate, but I don't know the rules for setting the contrasts for the F-test. The contrast matrix I used is: [1 -1 0 1 -1 0 0 0 0 0 0 0 ]/2 [1 0 -1 1 0 -1 0 0 0 0 0 0 ]/2 is it correct? Any help will be very appreciated. Best wishes, Bo Xiang
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