Hi SPM users,
I'm analyzing DTI data (fractional anisotropy) and I've got 2 groups of
subjects (n1=26, n2=13). I'm interested in the difference between the
relations of age and anisotropy of these groups, i.e. in the interaction
effect of group (nominal variable) and age (scale variable) on anisotropy.
However, I'm not sure which design I should use in SPM5 and what contrasts I
should enter. Any advice?
Thanks a lot, Adrian
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