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Hi Amy
if you attach the desighn file,it might help to answer correctly,no file
has been atached.
cheers


Elham Zareh(MD)
Mphil student
Movement science Group
School Of Life science
Oxford Brookes University
Fmrib centre,Oxford University
(0044)1865483272

I have data from 23 subjects on a task that has 6 different stimuli which
> represent a
> combination of two factors (probability and expected value). There are
> three levels of the
> probability factor and 2 levels of the expected value factor, resulting in
> the 6 stimuli. I am
> interested in conducting an ANOVA that would give me neural activity
> related to probability
> alone, expected value alone, and the interaction of the two. I am having
> trouble figuring
> how to do this- the examples in the FSL manual seem straightforward except
> I am unsure
> what the inputs are (copes from first level, I presume?) and they only use
> factors with 2
> levels so i am not sure how to make a similar model with 3 levels.
> Based on the FSL manual and previous posts, I thought I would need to
> create a design file
> with 23x6 inputs (copes for each stimulus type from individual feats).
> Then, each EV was a
> level of the first and second factors (resulting in 5 EVs). Once I did
> this, I realized that I
> didn't know how to create the interaction term.  I have attached the
> design file that I
> started for 8 of the subjects.
> Any help with this would be greatly appreciated!
>
> Amy Roy, Ph.D.
> NYU Child Study Center
>
>