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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gang
November 19, 2013 03:23PM
> response regressors, are the same across different dimensions, I get a collinearity warning during
> the execution of 3dDeconvolve. Would this result in instability of coefficients of any of the regressors?

It's possible but hard to tell in abstract sense. You can take a close look at the results and see if they are reasonable. If they are, then you're fine.

> If I am to search for voxels whose activations vary proportionally to shape dimensions, i.e., ABI of
> the present analysis, do I need to set Beta of the second regressor of AM2 as the overlay value
> and T-stats of the second regressor as the threshold on AFNI GUI?

Yes, that's exactly what you need to do.

Gang
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Subject Author Posted

AM regression with 3dDeconvolve and collinearity

doh November 16, 2013 04:32PM

Re: AM regression with 3dDeconvolve and collinearity

rick reynolds November 17, 2013 07:40PM

Re: AM regression with 3dDeconvolve and collinearity

doh November 17, 2013 08:48PM

Re: AM regression with 3dDeconvolve and collinearity

gang November 19, 2013 03:23PM

Re: AM regression with 3dDeconvolve and collinearity

rick reynolds November 20, 2013 06:15AM