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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gj
April 23, 2005 12:19AM
Hi,

I know you've answered this question a few years ago (http://afni.nimh.nih.gov/afni/afniboard/messages/626.html), but I'm still at a loss!

I'm using 3dDeconvolve to run a multiple regression analysis...but I'm still not quite sure what each sub-brickin 3dDeconvolve's output bucket file refers to. I ran 3dDeconvolve with polort=3 according to Bob Cox's ad hoc rule of thumb. Thus, for each run (concatenated in the input), I get 4 subbricks (P_0 Coef ... P_3 Coef). Do these coefficients represent the constant offset, coef for x, coef for x^2, coef for x^3, respectively? Or in the reverse order?

Then for each stimulus, I get one coefficient for each input stimulus. This is, according to your previous message, the height of the response respective to the baseline which I would need to calculate from the first few subbricks related to the drifts/trends in each of my runs?

Sorry for the ignorance -- thanks for the help!
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Subject Author Posted

3dDeconvolve as multiple regression

gj April 23, 2005 12:19AM

Re: 3dDeconvolve as multiple regression

Bob Cox April 23, 2005 11:50AM

Re: 3dDeconvolve as multiple regression

gj April 24, 2005 08:30PM