I'm sorry, but my difficult is due to lacking of an example with three levels/groups and one covariates. I have found a lot of example in the guide but they are referred to two levels with covariate or three levels is without covariates.

Please can you check these mtx?

3 classes 1 variable

contrast 1.mtx - diff A vs B 1 -1 0 0 0 0 contrast 2.mtx - slope for A and B 0 0 0 1 -1 0 contrast 3.mtx - diff A vs C 1 0 -1 0 0 0 contrast 4.mtx - slope for A and C 0 0 0 1 0 -1 contrast 5.mtx - diff B vs C 0 1 -1 0 0 0 contrast 6.mtx - slope for B and C 0 0 0 0 1 -1 groups effect.mtx 1 -1 0 0 0 0 1 0 -1 0 0 0 groups effect covariate slope.mtx 0 0 0 1 -1 0 0 0 0 1 0 -1 A+B vs C.mtx 0.5 0.5 -1 0 0 0 A+B vs C covariate slope.mtx 0 0 0 0.5 0.5 -1

Thank you very much,

Stefania

----Messaggio originale---- Da: greve@nmr.mgh.harvard.edu Data: 20-dic-2013 16.47 A: freesurfer@nmr.mgh.harvard.edu Ogg: Re: [Freesurfer] 3 groups and one covariate

Hi Stef, there are examples there with covariates. Can you follow those? doug On 12/19/2013 05:56 PM, yashin7020@libero.it wrote:

Hi experts, I'd like to find group difference (thickness) among 3 groups taking in

account

one covariate. I'd like to use DOSS. Is correct? I have read the guide and I have carried

out

fsgd file as suggest for Three Groups (One Factor/Three Levels), No

Covariates.

Now, my problem is "which are the .mtx that I should add?" Thanks a lot.

Stef

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