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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Gang Chen
May 17, 2004 05:29PM
Hi Barbara,

When you run 3dttest with two groups of data sets, the t statistic tests how significant (group2 - group1) is different from 0. Refer to 3dttest manual for details:

[afni.nimh.nih.gov]

Therefore if you get negative t value at a voxel, it means group 1 is more significantly activated at that voxel than group 2.

Would this interpretation be compatible with the two separate group analyses now?

BTW, is '-1blur_fwhm 6' an option in 3dttest? I never heard of it before.

Gang
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Subject Author Posted

puzzling 3dttest map

Barbara Cerf-Ducastel May 17, 2004 03:51PM

Re: puzzling 3dttest map

Gang Chen May 17, 2004 05:29PM

Re: puzzling 3dttest map

Barbara Cerf-Ducastel May 17, 2004 06:31PM

Re: puzzling 3dttest map

Rich Hammett May 17, 2004 06:47PM

Re: puzzling 3dttest map

Barbara Cerf-Ducastel May 17, 2004 07:08PM

Re: puzzling 3dttest map

Gang Chen May 17, 2004 07:52PM

thanks to the fresh eye!

Barbara Cerf-Ducastel May 17, 2004 08:30PM