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
March 07, 2014 06:03PM
> is there a way to convert the Full F-statistic that is spit out from 3dDeconvolve to show which
> regions are significant activation and which are deactivation?

The F-stat tests the following hypothesis:

beta1 = 0, beta2 = 0, beta3 = 0

Therefore as an omnibus test the F-stat does not directly show the activation directionality. However, if you believe that beta1 captures the major activation, you could use the sign of beta1 (or its t-stat) as an indication of activation vs. deactivation.

Gang
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Convert F-statistic to t-statistic

mp.schroed March 07, 2014 05:17PM

Re: Convert F-statistic to t-statistic

gang March 07, 2014 06:03PM