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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heatherb
August 21, 2019 12:32PM
Hello!

I have been working for a while now trying to get cluster thresholds by using 3dClustSim for a 3dLME group analysis I ran, but the thresholds I am getting still seem strangely low. For a wholebrain with functional data smoothed at 6 with 3dBlurToFWHM, at p threshold of .005, alpha of .05, NN2, bi-sided, it recommends a threshold of 16.3 (voxel size 3.125 mm x 3.125 mm x 3.125 mm). I am calculating my ACF values using 3dFWHMx and the input file is the residuals I collected from the 3dLME analysis I ran (which was supported as an option here: [afni.nimh.nih.gov]). Below are the ACF values output:
0 0 0 0
0.572146 2.46819 7.35051 6.73157

Do you have any ideas about what I might be missing? Please know if I can add additional information to help get to the bottom of this.

Thank you,
Heather
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Subject Author Posted

3dLME cluster thresholding

heatherb August 21, 2019 12:32PM

Re: 3dLME cluster thresholding

rick reynolds August 23, 2019 05:01PM

Re: 3dLME cluster thresholding

heatherb August 30, 2019 10:52PM