External Email - Use Caution
Hi,
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 (https://www.mail-archive.com/freesurfer@nmr.mgh.harvard.edu/msg32860.html), but with only one group. How would you recommend to proceed?
Many thanks,
Pilar
________________________________ Message: 2 Date: Wed, 27 Nov 2019 16:56:20 +0000 From: "Greve, Douglas N.,Ph.D." DGREVE@mgh.harvard.edu Subject: Re: [Freesurfer] [External] Freesurfer Digest, Vol 189, Issue 36 To: "freesurfer@nmr.mgh.harvard.edu" freesurfer@nmr.mgh.harvard.edu Message-ID: fbb77a97-61b5-fac5-e2b3-0ee327e29ce3@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 CautionYes, 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