19 Apr
2018
19 Apr
'18
4:48 p.m.
External Email - Use Caution
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