The basic contrast is (PM-PF)-(CM-CF) If that is positive, then it will be red, otherwise blue
This opens up a lot of possibilities as to what is driving the interaction, so it is hard to come up with a sentence like the one you are trying to state
doug
On 02/20/2014 02:25 PM, Yang, Daniel wrote:
Dear FreeSurfers,
I have two discrete and binary factors (Dx: patients vs. controls; Sex: female vs. male), one continuous variable (Age), one nuisance factor (IQ). If there is a 3-way interaction of Dx x Sex x Age, regressing out IQ, is the following interpretation correct?
Red/yellow: In females (vs. males), the Age effect of cortical thickening is stronger in patients (vs. controls). Blue/cyan: In females (vs. males), the Age effect of cortical thinning is stronger in patients (vs. controls).
Note. by stronger, I mean greater magnitude without sign.
Thanks, Daniel
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