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My doubt is, if it is possible to use a FSGD file to add variables to a --paired-diff analysis. If it is, what would be the right way to format the FSGD file.
Thanks in advance.
On Wed, Oct 30, 2019 at 3:01 PM Greve, Douglas N.,Ph.D. < DGREVE@mgh.harvard.edu> wrote:
I don't understand. What per hemisphere variable?
On 10/25/2019 3:15 AM, Jose Graterol wrote:
External Email - Use CautionThanks for your answer. A follow up question: How should I then specify the variable's values per hemisphere while making the FSGD file if I want to add covariates when running mri_glmfit?
Thanks in advance.
On Fri, Oct 25, 2019 at 12:18 AM Greve, Douglas N.,Ph.D. < DGREVE@mgh.harvard.edu> wrote:
If you are trying to determine whether the hemispheres are different, then you need to do the subtraction between the hemis (ie, the --paired-diff). If you want to look at the hemispheres separately, then don't combine them in a single file
On 10/21/19 4:58 AM, Jose Graterol wrote:
External Email - Use CautionThanks for your answer.
I want to correlate TMS values in 17 stroke patients. Following the instructions provided to Anders in this link
https://www.mail-archive.com/search?l=freesurfer@nmr.mgh.harvard.edu&q=s...
I created the --y file that joins the affected hemispheres together and the unaffected hemispheres together. I omitted the --paired-diff flag. When I run mri_glmfit with --fsgd it asks for 34 inputs. I am guessing those are for the 34 hemispheres of the patients in the order mentioned in my first email. Would this be the right way to correlate the variables?
In short, I am trying to test if there is a difference in cortical thickness, while adding covariates, between the affected and unaffected hemispheres in stroke patients.
Thanks in advance
On Fri, Oct 18, 2019 at 3:57 PM Greve, Douglas N.,Ph.D. <DGREVE@mgh.harvard.edu mailto:DGREVE@mgh.harvard.edu> wrote:
What are you trying to test? Usually you don't have lh and rh in the same glm On 10/17/19 7:09 AM, Jose Graterol wrote:External Email - Use Caution Dear Freesurfer Community, I have a question regarding the formatting of the FSGD file while doing an analysis with Xhemi. First the --y file was created as previously explained in another discussion (https://www.mail-archive.com/freesurfer@nmr.mgh.harvard.edu/msg63965.html ).
That is, mris_preproc with --xhemi and no --fsgd flag. If I understood correctly, that would create a mgh file with the following order: sub01lh, sub01rh, sub02lh, sub02rh... Then the FSGD file while running mri_glmfit would be: GroupDescriptorFile 1 Title xxx Class sub Variables var1 Input sub01lh sub var1_lh_sub01 Input sub01rh sub var1_rh_sub01 Input sub02lh sub var1_lh_sub02 Input sub02rh sub var1_rh_sub02 Would this be correct? If so, what would be the best case for specifying a variable like age? Just repeating the value 2 times? As always, thanks in advance Kind Regards José _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu <mailto:Freesurfer@nmr.mgh.harvard.edu>
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