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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
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



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