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
February 20, 2004 10:15AM
Partial F corresponding to a stimulus/contrast indicates how statistically significant this stimulus/contrast accounts for the whole variation in the output signal. Full Fstatistic tests whether one of the regressors (or stimuli) is statistically significant, that is, is the signal at a voxel simply just some noise OR activation due to ANY of the stimuli?

So if you want to check if there is any activation at a voxel, use full F as your thresholding quantity; otherwise if you want to know one condition-specific activation or contrast, go with the corresponding partial F.

Gang
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Thresholding/Stats Question

kelly February 20, 2004 09:30AM

Re: Thresholding/Stats Question

Gang Chen February 20, 2004 10:15AM