Ah I see. Okay, will give this a try. Thank you Doug!

Best regards,

Fred

On Mar 22, 2017, at 17:04, Douglas Greve greve@nmr.mgh.harvard.edu wrote:

when you ran mri_glmfit, you had to give it an input (eg, --y group1.mgh) with all the subjects from group 1. You would have a similar file for group2. You would then combine them into one file, eg

mri_concat group1.mgh group2.mgh --o group1-and2.mgh

you would then create a new FSGD file for both groups, then run mri_glmfit --y goup1-and2.mgh ...

...

On 3/22/17 4:55 PM, Uquillas, Federico D'Oleire wrote: Hi Doug, What do you mean by combining all the data (and how would you suggest we go about this?)? And also how does one do a two-group test?

Thank you!

Best,

Fred

...

On Mar 22, 2017, at 16:51, Uquillas, Federico D'Oleire FUQUILLAS@mgh.harvard.edu wrote:

Dear FreeSurfer experts,

I’ve been trying to find a way to get a map of the difference between two independent CTh association maps but can’t seem to find a solution.

I have two maps of independent groups (one is N=15, the other N=20) I would like to compare. Is there maybe a way to do a sig1.mgh – sig2.mgh and then visualize this? Not sure how to go about it. I’m basically trying to visualize what is left over after subtracting one map from the other (independent samples t-test of sorts).

Thank you so much for any help you may be able to provide!

Best regards,

Fred

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