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The method you describe is only for discrete variables, not continuous
ones. The traditional method for continuous variables is to create a new
variable where you multiply them together. You should normalize you
continuous variables too (ie, subtract the mean and divide by the stddev).
On 4/24/2023 8:52 PM, Fred d'Oleire Uquillas wrote:
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Dear Fs support,
If I have the following FSGD with 4 classes and 3 variables, and I'd
like to run an interaction of ROIa x ROIb controlling for the third
covariate (eTIV), would I use the following contrast?
[0 0 0 0 0.25 -0.25 -0.25 0.25 0.25 -0.25 -0.25 0.25 0 0 0 0]
For the interaction of ROIa x ROIb x class + eTIV.
Thank you so much in advance for your help!
All the best,
Fred
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