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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Juan
February 13, 2017 08:25PM
Hi, Bob,

Could you advise me how to use the cluster-level corrected alpha of .05 to report the group results now? Or could you let me know your new paper - does it address this issue? Is this method still valid: " the alpha-level for voxelwise statistical analysis was determined by simulations using the 3dClustSim program of the AFNI toolkit. For these simulations, the smoothness of the data in three directions was estimated using 3dFWHMx on the residual time series of gray-matter voxels in each participant and then averaged across participants (FWHMx = xxx mm; FWHMy = xxx mm; FWHMz = xxx mm). Based on a voxel-level uncorrected alpha of .001, simulations indicated a minimum cluster extent of xx voxels for a cluster-level corrected alpha of .05".

Thanks,
J
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Subject Author Posted

3dClustSim

alr4655 February 02, 2017 01:54PM

Re: 3dClustSim

Bob Cox February 02, 2017 06:42PM

Re: 3dClustSim

Juan February 13, 2017 08:25PM

Re: 3dClustSim

juand March 08, 2017 08:01AM

Re: 3dClustSim

ptaylor March 08, 2017 10:00AM