They are identical (QDEC actually calls mri_glmfit).

If you are going to use continuous variables, make sure you do something rational in terms of demeaning them or creating a contrast that tests them at a certain value.

doug

Rosa Steimke wrote:

Hi! i have a question regarding the differences between qdec and glm dods. im trying to find out how to analyze my data. I have 1-2 variables of which I want to see the relation to thickness (Autism (discrete) + Empathy (continuous))and maybe 1-2 (gender+IQ) variables that I would want to controle for. Now i cannot understand whether it would be better for me to use the General Linear Model DODS or qdec. What are the differences/advantages. thanks in advance. Rosa

Rosa Steimke Student Master of Neuroscience Vrije Universiteit Amsterdam