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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October 22, 2007 11:08AM
> Can AM regression be used to model a quadratic trend? Or should I
> treat each level as a separate regressor and then use a GLT to test
> for a quadratic relationship?

It seems to me a GLT approach with the following set of coefficients is at least more practical at this point:

28 7 -8 -17 -20 -17 -8 7 28

Don't ask me how these numbers are generated: They are God-given.

Gang
Subject Author Posted

Quadratic Trend / AM Regression?

Andrew October 22, 2007 10:54AM

Re: Quadratic Trend / AM Regression?

bob cox October 22, 2007 11:06AM

Re: Quadratic Trend / AM Regression?

AFNI Gang October 22, 2007 11:08AM

Re: Quadratic Trend / AM Regression?

Andrew October 22, 2007 11:41AM

Re: Quadratic Trend / AM Regression?

AFNI Gang October 22, 2007 12:54PM

Re: Quadratic Trend / AM Regression?

Andrew October 22, 2007 01:49PM