Yes, if the contrast matrix is correct, then everything should be fine. Also check the design matrix (but I'm pretty sure that will be correct).

On 04/05/2016 04:07 AM, tom parker wrote:

Hi Freesurfers,

I posted this question a few days ago but didn't get any replies. Would you mind answering this for me?

I compared 2 groups, while controlling for 1 covariate in qdec using freesurfer 5.1.

There were no significant interactions with the covariate so I need to use DOSS.

I read on several post that DOSS has some bugs related to the generation of contrasts in qdec and that mri_glmfit should be used to run a DOSS analysis.

However, when I ran my analysis with DOSS in qdec I saw that the C.mat file looked like this: 1 -1 0, which seems correct to me.

My question is can I use DOSS in qdec in this case? Or are there other bugs related to using it in qdec?

Thank you so much!

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