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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lhopkins
July 17, 2017 06:09PM
Hi Gurus:

I've gone though the entire process of using 3dFWHMx and 3dClustSim to get cluster thresholding values.
I understand that it is more accurate to run 3dClustSim with a mask that is the same dimensions as what you got off the scanner so that's what I did. Basically I ran 3dFWHMx on the 4x1.8x1.8 .errts files and got the acf values from that and then used a 4x1.8x1.8 mask file with the acf values as the input to 3dClustSim.

My question is: We want to apply these values to a statistical dataset that is 1x1x1. In order to get the correct cluster sizes should we just multiply the cluster sizes in the table by 13 (1.8x1.8x4)?

I guess I'm just curious about "converting" cluster sizes among datasets of different dimensions.

Thanks for any insight!
Lauren
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Subject Author Posted

3dClustSim from orig to standard voxel size

lhopkins July 17, 2017 06:09PM

Re: 3dClustSim from orig to standard voxel size

rick reynolds July 26, 2017 05:10PM

Re: 3dClustSim from orig to standard voxel size

lhopkins July 27, 2017 02:33PM