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

History of AFNI updates  

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April 12, 2022 04:45PM
Did you visualize some of your power spectra, both before and after taking the log (or log-log, in your case) of it? Are you sure you aren't including any super-low freqs that are essentially baseline, that might skew your results? A super high exponent for a power spectrum suggests that baseline might be left in your data.

I would try visualizing your data (here, power spectra, etc.) as a first means for QCing it.

I am also not sure what a statistically appropriate way to average PLEs across voxels would be.

--pt
Subject Author Posted

3dPeriodogram/3dLombScargle - Preprocessing

Philipp April 12, 2022 01:27PM

Re: 3dPeriodogram/3dLombScargle - Preprocessing

ptaylor April 12, 2022 04:45PM

Re: 3dPeriodogram/3dLombScargle - Preprocessing Attachments

Philipp April 13, 2022 06:41AM

Re: 3dPeriodogram/3dLombScargle - Preprocessing

ptaylor April 13, 2022 08:55AM

Re: 3dPeriodogram/3dLombScargle - Preprocessing

Philipp April 13, 2022 10:23AM