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
September 19, 2019 10:39AM
> I don't understand mathematically why the standard deviations of the coefficients should be different

In general they should be different unless under some special circumstances. See the exact formula on page 12 of the 3dDeconvolve manual (or any textbook about regression): [afni.nimh.nih.gov]

> So assuming they are really different, then what would be the right t-map to take if I want a contrast at the single-subject level?

You should put your trust on 3dDeconvolve (with option -gltsym) in this case.

Gang



Edited 1 time(s). Last edit at 09/19/2019 10:39AM by Gang.
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Subject Author Posted

contrast map - gltsym vs. 3dcalc

Galit September 16, 2019 03:10AM

Re: contrast map - gltsym vs. 3dcalc

rick reynolds September 16, 2019 08:56AM

Re: contrast map - gltsym vs. 3dcalc

Galit September 18, 2019 04:59AM

Re: contrast map - gltsym vs. 3dcalc

gang September 18, 2019 02:52PM

Re: contrast map - gltsym vs. 3dcalc

Galit September 19, 2019 06:37AM

Re: contrast map - gltsym vs. 3dcalc

gang September 19, 2019 10:39AM