Hello,
I have two questions:
We are doing fmri studies with analysis in SPM99b.
First,
With the random effects analysis does the following seem correct:
I have two groups, each subject has two conditions,
First set up a design matrix including all subjects and look at each
subject
individually. This will create a contrast image for each subject. Then
using
the basic stats use ANOVA with two groups. Then enter the contrast images
from
each group into their respective groups. Finally set a contrast of [-1 1]
to
look at the between group effects.
Second,
I have a study with three conditions, each having two factors, how would I
look
at the main effects and the interactions using the contrasts? So this
is a 2x2x2 ANOVA. Also how
would I
use recation times as a covariate in the design matrix? What would the
contrasts be to look at any effects of the covariates?
Thanks,
Jason.
Jason R. Steffener, RTSV
Department of Psychiatry, University Hospital, UMDNJ
Office: (973) 972-1604
http://www.umdnj.edu/~steffejr/jason.html
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