3 classes ( A / B / C group) and 4 variables (gender, age, education, and Moca test score). 

group.diff.mtx         1 -1 0  0 0 0   0 0 0   0 0 0   0 0 0 
group-x-gender.mtx     0 0 0   1 -1 0  0 0 0   0 0 0   0 0 0
group-x-age.mtx        0 0 0   0 0 0   1 -1 0  0 0 0   0 0 0
group-x-education.mtx  0 0 0   0 0 0   0 0 0   1 -1 0  0 0 0
group-x-moca.mtx       0 0 0   0 0 0   0 0 0   0 0 0   1 -1 0
group-x-gender-x-age-x-education.mtx 
                       0 0 0  1 -1 0  0 0 0    0 0 0   0 0 0 
                       0 0 0  0 0 0   1 -1 0   0 0 0   0 0 0 
                       0 0 0  0 0 0   0 0 0    1 -1 0  0 0 0 
group-x-gender-x-age-x-education-x-moca.mtx
                       0 0 0  1 -1 0  0 0 0    0 0 0   0 0 0 
                       0 0 0  0 0 0   1 -1 0   0 0 0   0 0 0
                       0 0 0  0 0 0   0 0 0    1 -1 0  0 0 0
		       0 0 0  0 0 0   0 0 0    0 0 0  1 -1 0

group.diff.mtx also can write as:   1 0 0  0 0 0   0 0 0   0 0 0   0 0 0  
                                                      0 1 0  0 0 0   0 0 0   0 0 0   0 0 0  
                                                      0 0 1  0 0 0   0 0 0   0 0 0   0 0 0  

group-x-age.mtx aslo can write as:  0 0 0  1 0 0  0 0 0   0 0 0   0 0 0   
                                                         0 0 0  0 1 0  0 0 0   0 0 0   0 0 0   
                                                         0 0 0  0 0 1  0 0 0   0 0 0   0 0 0 				   

.

Wishes,

Li

>
>When replying, please edit your Subject line so it is more specific
>than "Re: Contents of Freesurfer digest..."
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>Today's Topics:
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>   1. Re: How to create a 3g4v matrix (Lee Tirrell)
>
>
>----------------------------------------------------------------------
>
>Message: 1
>Date: Mon, 23 Nov 2015 10:27:42 -0500 (EST)
>From: Lee Tirrell <ltirrell@nmr.mgh.harvard.edu>
>Subject: Re: [Freesurfer] How to create a 3g4v matrix
>To: Freesurfer support list <freesurfer@nmr.mgh.harvard.edu>
>Message-ID:
>	<alpine.LRH.2.20.1511231020130.5623@vermis.nmr.mgh.harvard.edu>
>Content-Type: text/plain; charset="iso-8859-7"
>
>Hi Li,
>
>You can find some example FSGD tables here, which you can alter to fit your 
>analyses.
>
>https://surfer.nmr.mgh.harvard.edu/fswiki/FsgdExamples
>
>Best,
>Lee
>
>On Sun, 22 Nov 2015, nellie wrote:
>
>> 
>> Hi Freesurfer Experts,
>> 
>> I?m a new user of Freesurfer, and I learn how to use this software mainly through Wiki. When I came to the step of using GLM to compare group differences, I was confused on the design of 3g4v matrix. In my study, there were 3 classes (
>> A / B / C group) and 4 concomitant?variables (gender, age, education, and Moca test score). It?s supposed to be 15 regressors in this design, but I don?t know how to use the numbers (like 1, -1, 0, 0.5, -0.5, etc.) to create a correct 
>> matrix. I wonder if you could provide a 3g4v matrix in detail for me. I?ll be grateful if you can help. I hope I?m not bothering you too much, and I?m looking for your reply.
>> 
>> Best wishes,
>> 
>> Li?
>> 
>> 
>> 
>> ?
>> 
>> 
>>
>
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