Dear FS Experts,

I am asking same question again since did not get any reply.

I processed my data with FS 5.3 version and running analysis in Qedc GUI with DODS that include 2 groups (control and heart Failure). I want to see the cortical thickness difference between these 2 groups, with age and gender as a covariate.

In Qdec GUI, model factors have three options that include the fixed factor,
continuous factor (covariate) and nuisance variable. So group (control and heart
failure) belongs to fixed factor while age and gender belongs to both
continuous factor and nuisance variable.

When I am running this analysis in Qdec by selecting the model that include
only group the contrast vector in the Qdec terminal is 1, -1,
and I believe its fine.

But when I am designing the model that includes age and gender as a
nuisance factor, the contrast vector showing 1, -1, 0, 0, 0, 0, on the Qdec terminal.

So my question is why we have two extra 0, 0 in contrast vector, as per my understanding it should be 1, -1, 0, 0, please explain.

I also need to run it with DOSS. Would you please advise how to run the same analysis with DOSS from terminal and if it is possible to look at the results in QDEC Display again.

Another question: When I finished the analysis in Qdec and got the state
data tables, that have 18 files, with volume, area, curv and thickness from
both left and right sides. I am interested in cortical thickness and it's have four files with left and right with two versions. for example for left side one is lh.aparc.a2009s and one is lh.aparc.

I am not sure which file should I used for the analysis. I believe for left side qdec is using lh.aparc, Is I am right?

With Regards,

Santosh K. Yadav

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