External Email - Use Caution        


I apologize if I did not explain my issue properly.
I'm interested in looking at age-related thickness reductions in 1 group 
(patients), but I'd like to also account for the effect of disease duration.
We can say that in my case disease duration is the nuisance factor.
Briefly, I have the same issue reported in here 
but with only one group.
How would you recommend to proceed?

Many  thanks,


Message: 2
Date: Wed, 27 Nov 2019 16:56:20 +0000
From: "Greve, Douglas N.,Ph.D." <dgr...@mgh.harvard.edu>
Subject: Re: [Freesurfer] [External] Freesurfer Digest, Vol 189, Issue
To: "freesurfer@nmr.mgh.harvard.edu" <freesurfer@nmr.mgh.harvard.edu>
Message-ID: <fbb77a97-61b5-fac5-e2b3-0ee327e29...@mgh.harvard.edu>
Content-Type: text/plain; charset="utf-8"

what is the difference between and independent variable and a covariate?

On 11/27/2019 6:57 AM, Ferraro, Pilar wrote:
>          External Email - Use Caution
> Yes, I did.
> But in this case I have two factors, not only one. In particular, I have an 
> independent variable X and a covariate I?d like to include in the model.
> How would you suggest to proceed?
> Thanks,
> Pilar
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