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Hi FreeSurfer Experts,

I want to test the relationship between cortical thickness and two
continuous covariates (interaction) while controlling for one categorical
variable. In QDEC, I can only choose one covariate, so I created a new
variable that is a dot product (covariate1*covariate2) of the two to
represent interaction. After analyzing, when I look at the data points at a
single voxel, there is no visual indication of interaction. There also is
no fitted line.

Am I utilizing QDEC correctly?

Thank you for your help!

-- 
David S. Lee
Associate Research Specialist
Center for Healthy Minds
University of Wisconsin - Madison
(608) 890-1115
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