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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bob cox
November 10, 2009 12:57AM
I don't know what you mean by an interaction between 3 variables.

When you have 4 variables, you can think of them in a 2x2 table:

a b
c d

Then if you want to test if there is a difference between the change in values across the row (or column) direction, we'd calculate

(a-b) - (c-d) = a - b - c + d

But if we have 3 variables, I'm not sure how you would lay them out to test an "interaction".
Subject Author Posted

Interactions with gltsym

Anjali November 09, 2009 06:46PM

Re: Interactions with gltsym

bob cox November 10, 2009 12:57AM

Re: Interactions with gltsym

Anjali November 11, 2009 12:28PM

Re: Interactions with gltsym

bob cox November 11, 2009 05:53PM