 |
 |
From: Carsten Finke <[log in to unmask]>
Date: 28 April 2012 13:04:35 GMT+01:00
Subject: [FSL] PPI regressor A-B, but what about C and D?
Reply-To: FSL - FMRIB's Software Library <[log in to unmask]>
Dear Jill, dear FSL experts,
following the very helpful guide by Jill O'Reilly I want to set up a PPI analysis for a dataset with 4 conditions (A, B, C, D). For the PPI analysis, I am interested in A-B. The PPI FAQs says that I should not include A and B (the design will be rank deficient), but A+B (to soak up shared variance).
Now I am not sure what to do with my conditions C and D. Should I include them as separate EVs of no interest (C, D)?
Many thanks
Carsten