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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NeuroPerson
June 05, 2019 03:29PM
I've been using 3dTproject to run denoising with bandpassing. However, I have noticed that the voxels in the detrended outputs do not quite have a temporal mean of zero, as would be expected of residuals from a linear regression. Is this just due to the accumulation of floating-point error? Or is there something about the mathematics of this process that I am misunderstanding?

A minimal working example (given an input image "input.nii.gz")

3dTproject -input "input.nii.gz" -prefix "detrended.nii.gz" -ort "design.tsv" -passband 0.009 0.080
3dTstat -mean -prefix "mean_detrended.nii.gz" "detrended.nii.gz"
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Subject Author Posted

Nonzero residuals from 3dTproject?

NeuroPerson June 05, 2019 03:29PM

Re: Nonzero residuals from 3dTproject?

rick reynolds June 05, 2019 03:52PM

Re: Nonzero residuals from 3dTproject?

NeuroPerson June 06, 2019 03:35PM