QDEC is mostly depreicated. Use the command-line stream. See the group analysis on this page https://surfer.nmr.mgh.harvard.edu/fswiki/FsTutorial
On 04/19/2018 04:48 PM, David S Lee wrote:
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 tel:%28608%29%20890-1115
Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer