AFNI Message Board

Dear AFNI users-

We are very pleased to announce that the new AFNI Message Board framework is up! Please join us at:

https://discuss.afni.nimh.nih.gov

Existing user accounts have been migrated, so returning users can login by requesting a password reset. New users can create accounts, as well, through a standard account creation process. Please note that these setup emails might initially go to spam folders (esp. for NIH users!), so please check those locations in the beginning.

The current Message Board discussion threads have been migrated to the new framework. The current Message Board will remain visible, but read-only, for a little while.

Sincerely, AFNI HQ

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Marco P
September 29, 2014 09:19AM
Dear AFNI experts,

After preprocessing, I'm running 2 seed based correlations with resting state data in parallel to obtain correlation maps of the 2 groups of my experiment. Afterwards, I want to understand whether these two maps (obtianined with the same seed) are significantly different between the two groups. I use:

3dttest++ -prefix blabla.nii -setA group1/*.nii -setB group2/*.nii
3dcalc -a blabla.nii[0] -expr a -prefix map_mean.nii

Is it correct?
If so, why if I reverse group A and B

3dttest++ -prefix blabla.nii -setB group1/*.nii -setA group2/*.nii
3dcalc -a blabla.nii[0] -expr a -prefix map_mean.nii

I obtain different results/maps?

Thanks for your support.
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Subject Author Posted

t-test - 3dttest++

Marco P September 29, 2014 09:19AM

Re: t-test - 3dttest++

gang September 29, 2014 10:27AM