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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Jim Bjork
July 25, 2003 04:31PM
It seems to me another approach to normalizing individual differences for group comparisons in our unique case would be to SCALE, on a voxel-wise basis, these deviations from zero mean by dividing all values in the voxel by the absolute value of the MAXIMUM deviation that occured in the time series.

The following script seems like it would work, but does not result in a scaled 3d+time series dataset (on which to apply a regression).

3dTstat -abs(max) -prefix maxbrain par12dsbpfnew+orig
3drefit -abuc maxbrain+orig

3dcalc -datum float -a par12dsbpnew+orig -b maxbrain -expr '(a/b)' -prefix normalized

What is wrong with this picture?

Jim B

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Normalizing Fourier-transformed data

Jim Bjork July 25, 2003 12:49PM

A better idea?

Jim Bjork July 25, 2003 04:31PM

Re: Normalizing Fourier-transformed data

Tom Ross July 25, 2003 04:58PM

Re: Normalizing Fourier-transformed data

Jim Bjork July 30, 2003 01:17PM