jack -
it is my understanding that each column of the design matrix is demeaned as
well. (based on this thread:
http://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=ind02&L=fsl&D=0&I=-1&P=13070
). however, i cannot think of a way to calculate the mean of each regressor
without the error terms of each regression.
perhaps the fmrib wizards have a potion we can use ?
-Ram
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