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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B. Douglas Ward
March 18, 2003 05:54PM
Hello Paul:

I'm not sure what you mean by "collapse across individual subjects".
There are various 3dmerge options for clustering and counting active voxels
across subjects.

If you want to perform a statistical test across subjects at each voxel
location, you should perform this analysis BEFORE clustering. There are
numerous AFNI programs for across-subject statistical analysis, including
3dttest, 3dANOVA, 3dANOVA2, 3dANOVA3, 3dRegAna, 3dMannWhitney, 3dWilcoxon,
3dKruskalWallis, and 3dFriedman. Clustering can then be performed on this
final statistical result. Program AlphaSim may be helpful in setting the
combination of prob. threshold and cluster size threshold to obtain the
desired overall Alpha level.

Doug Ward
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Subject Author Posted

Presentation of Group data?

Paul L March 17, 2003 10:50AM

Re: Presentation of Group data?

B. Douglas Ward March 18, 2003 05:54PM

Re: Presentation of Group data?

Paul L March 19, 2003 11:21AM