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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