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
December 13, 2016 03:33PM
> Are these methods doing the SAME things? Or do we in some way treat the variance differently?

Yes, the two approaches should end up with the same result since you're only taking the effect estimates (beta values) for group analysis; in other words, a paired t-test between two conditions is essentially the same as a one-sample t-test on the contrast between the two conditions.

On the other hand, if you want to take the reliability from each effect estimate (beta) into consideration at the group level (e.g., using 3dMEMA), then you would have to obtain the contrast and its t-stat and feed them into the group analysis.

Gang



Edited 1 time(s). Last edit at 12/13/2016 03:36PM by Gang.
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Subject Author Posted

First level contrast VS 3dttest++ with -paired -AminusB

Robin December 13, 2016 12:58PM

Re: First level contrast VS 3dttest++ with -paired -AminusB

gang December 13, 2016 03:33PM

Re: First level contrast VS 3dttest++ with -paired -AminusB

Robin December 14, 2016 10:16AM

Re: First level contrast VS 3dttest++ with -paired -AminusB

gang December 15, 2016 08:12AM