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, 2019 01:57PM
> When I run 2 sessions at a time, I do get similar beta coefficients, but I get a slightly bigger
> T-Stat than if I run each run individually. Do you know why that is?

The reason is that with the two runs combined, you double the number of data points to estimate the residuals (noise), leading to slightly more precise and smaller standard error for each effect estimate.

For your question, you should not use parentheses when setting up a general linear test. However, it's not clear to me what is your utmost goal. Why are you doing conjunction analysis?

Gang
Subject Author Posted

Contrast between two separate scans

Dxc536 April 05, 2019 11:15AM

Re: Contrast between two separate scans

gang April 05, 2019 04:29PM

Re: Contrast between two separate scans

Dxc536 April 08, 2019 11:47AM

Re: Contrast between two separate scans

gang April 08, 2019 05:19PM

Re: Contrast between two separate scans

Cunnind6 April 10, 2019 01:56PM

Re: Contrast between two separate scans

gang April 10, 2019 08:53PM

Re: Contrast between two separate scans

Dxc536 April 11, 2019 01:08PM

Re: Contrast between two separate scans

Cunnind6 April 11, 2019 07:07PM

Re: Contrast between two separate scans

gang April 12, 2019 01:57PM