Dear Nia,
I would choose the former option: model both sessions in one design
matrix and use the same coordinates for VOIs. This ensures the
comparability of the model parameters that you want to compare
between placebo and
drug condition.
Best wishes
Klaas
At 09:27 12/01/2007, you wrote:
>Dear all I have data which I would like to analyse with DCM. I have
>a drug condition and a placebo condition. Should I model both
>sessions together in the same design matrix and use the same
>coordinates for both sessions for my VOI's, or should I model both
>sessions separately and use optimal coordinates from the individual
>sessions? Many thanks
>Nia
>___________________________________________________________ What
>kind of emailer are you? Find out today - get a free analysis of
>your email personality. Take the quiz at the Yahoo! Mail
>Championship. http://uk.rd.yahoo.com/evt=44106/*http://mail.yahoo.net/uk
|