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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jyaros
June 29, 2020 03:28PM
Hi there!
Looking for clarification on significance estimates for individual clusters in the clusterize gui.

I notice that some clusters have a p-value inequality with two <<, and others have just one <
What is the difference between p <<.01 and p <.01 ? How should we be reporting the corrected significance of these clusters?
For instance see the url link to this image:

Cluster Table

The table says that over 98 voxels has a threshold of p : .01. In my case, clusters with anywhere between 200 (cluster 4) and 4000 (cluster 1) voxels have an indicated p value of p<<.01. But I would expect the 200 voxel cluster with a reported p <<.01 would be more similar in significance to a cluster of 140 voxels (cluster 5) with p <.01, rather than a cluster of 4000!

Thanks in advance for the help!
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Subject Author Posted

Interpreting 3dClustSim cluster significance

jyaros June 29, 2020 03:28PM

Re: Interpreting 3dClustSim cluster significance

ptaylor June 29, 2020 04:43PM

Re: Interpreting 3dClustSim cluster significance

jyaros July 01, 2020 03:09PM