What is your source data? It looks like you have two time points per subject, but the names of "offset" and "slope" suggest some preprocessing?
Input hc001-lRsk_offset hc001 1 0 0 Input hc001-lRsk_slope hc001 0 0 0 Input hc001-mRsk_offset hc001 0 1 0 Input hc001-mRsk_slope hc001 0 0 0 Input hc001-hRsk_offset hc001 0 0 1 Input hc001-hRsk_slope hc001 0 0 0
On 04/11/2016 10:09 AM, Afzal, Afsana wrote:
Hi Doug,
I've attached the fsgd file and the contrast matrix file. Thanks for your help!
- Afsana
Afsana Afzal Clinical Research Coordinator Massachusetts General Hospital Division of Neurotherapeutics Department of Psychiatry: Neurosciences 149 13th St, Room 2612 Charlestown, MA 02129 Phone: 617-643-5129 Fax: 617-726-4078
From: freesurfer-bounces@nmr.mgh.harvard.edu [freesurfer-bounces@nmr.mgh.harvard.edu] on behalf of Douglas N Greve [greve@nmr.mgh.harvard.edu] Sent: Friday, April 08, 2016 12:07 PM To: freesurfer@nmr.mgh.harvard.edu Subject: Re: [Freesurfer] Group level analysis: Specifying contrasts
I don't know what you mean, can you just send the header of the fsgd file and the contrast matrix?
On 04/04/2016 11:20 AM, Afzal, Afsana wrote:
Hi,
I want to perform a linear regression for a task with 3 different risk conditions (low, medium, high) with the following linear trend: low = 1, medium = 2, high = 3.
Right now I'm specifying the above weighted under each risk condition in my contrast matrix. Is this the correct approach? I want to make sure I am calculating a regression and not a weighted average.
Thank you for your help,
Afsana
*Afsana Afzal* Clinical Research Coordinator Massachusetts General Hospital Division of Neurotherapeutics Department of Psychiatry: Neurosciences 149 13th St, Room 2612 Charlestown, MA 02129 Phone: 617-643-5129 Fax: 617-726-4078
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