Hi Lee,
Thank you for your reply. I had read the example tables, but I'm still not sure
how to alter them into my study.May be you could help to check the matrix I
designed and tell me my mistake?
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
Thank you in advence.
Wishes,
Li
>
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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 <ltirr...@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.2.20.1511231020130.5...@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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