I can't tell from your description what you did. Can you be more specific? Did you use DODS or DOSS? Did you demean the ages?

doug

mmoayedi@uhnres.utoronto.ca wrote:

Hi everyone,

I was hoping you can clarify something for me.

I'm comparing two groups using CTA (in freesurfer). When I set up my model, I include age as a covariate of no interest. To do this, I include it as a variable in the fsgd, and in the contrast matrix, I regress out the effects of age, by setting the vectors to 0.

However, when I extract the results from the analysis (the thickness values), and graph them against age, I find that I have an interaction, or an age effect nonetheless.

Could you please shed some light on this for me?

Thanks,

Massih

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