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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Rutvik Desai
March 08, 2006 12:42PM
I have data from the same subject collected on two different days. Condition A is on the first day and condition B on the second day. I want to compute the contrast A-B. One way is to register the two sessions together, and then analyze the data as if it were from a single session, computing A-B with a 1 -1 glt. A second way is to analyze each session separately, and then do a

3dttest -paired -set1 <sess1data> -set2 <sess2data>

Are these two methods statistically equivalent? Is one preferable over another? Thanks.
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Subject Author Posted

glt vs. ttest

Rutvik Desai March 08, 2006 12:42PM

Re: glt vs. ttest

Gang Chen March 08, 2006 02:43PM

Re: glt vs. ttest

Rutvik Desai March 08, 2006 02:50PM