Hi Daniel, I 'm not sure what your question is ... doug

On 09/29/2013 08:30 AM, Daniel Klein wrote:

Dear FreeSurfer experts,

thanks a lot for your solution. It works fine. I have some further questions to polynomial fitting with qdec, to prevent misunderstandings from my point of view.

Only to be sure:

1. Linear effects of age: age as continuus factor.
2. Quadratic effects of age: age (quadratic) as continuus factor and

age (linear) as nuisance factor. 3) Cubic effects of age: age (cubic) as continuus factor and age (linear) as nuisance factor. 4) Linear+quadratic+cubic effects together: i will have to use mri_glmfit with FSGD file.

Best wishes

Daniel...

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