Hello Maria,
>Hello SPMers
>I have two groups, control and patient, each subject has a psych score.
>I have run a within group , simple correlation analysis(basic models) using the
>psych score as the covariate.
> Now, I would like to compare the two groups in a correlation analysis with
>psych score. (control>patient, patient>control
> Can anyone explain to me how I would go about doing this?
>
>
one group, one cov = simple regression; thus 2 groups and 1cov =
multiple regression
select all subjects, enter 4 cov: gp1, gp2, perf gp1, perf gp2 ..
then you can compute gp1 diff gp2 and coef corr gp1 diff coef corr gp2 :-)
best
cyril
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