Hi Klara, in QDEC, this contrast will automatically be computed. It should read something like "Is there a difference of thickness/age slopes between males and females". If you do it from the command line (mri_glmfit), search our wiki for the term "FSGD" and go to the examples page. doug

On 04/02/2013 02:27 PM, Klara Mareckova wrote:

Hi,

I'm new to freesurfer and I'm trying to use qdec to run a 2-way anova (sex, age, sex*age). How do I set up the design to get results for the interaction? Do I do that withing the qdec design tab? Or how else do I do it? (e.g. do I need to create a FSGD file? But where in qdec would I upload it?)

Thanks a lot for your advice,

Klara

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