Re: [Freesurfer] contrast-FSGD question

2023-05-02 Thread Fred d'Oleire Uquillas
External Email - Use Caution Hi Doug, The FSGD looks like the attached. For the contrast: [ 0 0 0 0 0.5 -0.5 -0.5 0.5 0 0 0 0], to model the 3-way interaction between Class and the new multiplied continuous interaction variable controlling for eTIV. That brainmap, where we multip

Re: [Freesurfer] contrast-FSGD question

2023-05-01 Thread Douglas N. Greve
External Email - Use Caution not sure, what you're new FSGD is On 4/28/2023 1:23 PM, Federico Uquillas wrote: External Email - Use Caution Thank you so much! Okie doke. So then, for an interaction between gender x handedness x ROIsInteractionTerm (continuous), control

Re: [Freesurfer] contrast-FSGD question

2023-04-28 Thread Federico Uquillas
External Email - Use CautionThank 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

Re: [Freesurfer] contrast-FSGD question

2023-04-28 Thread Douglas N. Greve
External Email - Use Caution 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

Re: [Freesurfer] contrast-FSGD question

2023-04-27 Thread Federico Uquillas
External Email - Use Caution Bumping this up. Thanks so much! Best, Fred > On Apr 24, 2023, at 8:52 PM, Fred d'Oleire Uquillas > wrote: > >  > 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 R