Dear SPM Group:
I have SPM z score volumes on 5 individuals, each z score volume
resulted from the identical contrast following the same experimental fMRI
run. Each individual's z score volume has also been rethresholded. I
want to create a group volume.
Is it valid to just average across individuals and create a mean z score
volume?
Other methods such as summing the z volumes and dividing by
square root of k have been suggested to me (k represents the number
of z score maps, which in this case would be 5).
Any thoughts?
Thank you. Joe Tracy
I want s on on five ind
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