Hi,
Yes, this is fine I think. In fact, this is the same as the question
from a few days ago - see also my suggestion for an alternative design:
http://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=ind0804&L=fsl&T=0&F=&S=&X=7F4BCC5E5F6D5C898D&Y=steve%40fmrib.ox.ac.uk&P=52213
Cheers.
On 30 Apr 2008, at 20:22, Yoshiko Yamada wrote:
> Dear List,
>
> I’m trying to do correlational analysis between BOLD and behavioral
> scores.
> What I’d like to do is to see the correlation between change in BOLD
> from
> the 1st to the 2nd session (i.e., 2nd > 1st) and correlated it with
> change
> in behavioral scores from the 1st to the 2nd session. I have 7
> subjects, and
> I entered 1st and 2nd session cope images for each subject and set
> up the
> model as in the attachments.
>
> Under EV1 (pre-post), I entered individually demeaned behavioral
> scores. (I
> computed the mean of the 1st (pre) and 2nd (post) session scores and
> subtracted the mean from the 1st and 2nd session scores. Therefore,
> the
> absolute values for each subject for 1st and 2nd session are the
> same.)
>
> In the Contrasts & F-tests ta, I defined two contrasts as follows:
>
> Title EV1 EV2 EV3 …
> C1 1st>2nd 1 0 0 … (negative correlation)
> C2 2nd>1st -1 0 0 … (positive correlation)
>
> I ran the analysis, and it seemed to have gone fine. I checked the
> activation images in FEAT report, and they seem to make sense, but I
> wanted
> to make sure that I had set up the Stats correctly.
>
> Has anyone done this type of analysis? Have I set up the Stats
> correctly?
>
> Thank you in advance for your help!
>
> -Yoshiko
>
>
>
> <EVs.png>
---------------------------------------------------------------------------
Stephen M. Smith, Professor of Biomedical Engineering
Associate Director, Oxford University FMRIB Centre
FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK
+44 (0) 1865 222726 (fax 222717)
[log in to unmask] http://www.fmrib.ox.ac.uk/~steve
---------------------------------------------------------------------------
|