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
January 21, 2016 05:07PM
> To use 3dcalc to get the contrast, do I just subtract the beta coefficients?

Yes, that's right.

> How would I get t-values for that?

For that you'd have to get from 3dDeconvolve or 3dREMLfit.

> I have 6 independent variables, and they are all fractional anisotropy values of different white matter tracts.
> So I have a value for each person.

Do you mean that you have actually 6 values per subjects? You can use 3dttest++ (beta values only as input) or 3dMEMA (beta plus t-stat as input).

Gang
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Subject Author Posted

Multiple Regression

archerdb January 20, 2016 02:59PM

Re: Multiple Regression

gang January 20, 2016 06:54PM

Re: Multiple Regression

archerdb January 21, 2016 09:15AM

Re: Multiple Regression

gang January 21, 2016 05:07PM

Re: Multiple Regression

archerdb January 22, 2016 11:27AM

Re: Multiple Regression

gang January 22, 2016 02:36PM