External Email - Use Caution Thank you so much!
Okie doke. So then, for an interaction between gender x handedness x ROIsInteractionTerm (continuous), controlling for eTIV, the contrast would be the following?
[ 0 0 0 0 0.5 -0.5 -0.5 0.5 0 0 0 0]
All the best,
Fred On Apr 28, 2023, at 10:30 AM, Douglas N. Greve <dgr...@mgh.harvard.edu> wrote:
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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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Caution
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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