Dear SPMers,
I am running a correlation analysis, I have 2 groups and I would like to compare
the 2 groups, A>B and B>A and correlate this comparison with a psych score.
Would I in a fixed effects model: enter all the subjects, then create a con.img
for each subject 1-26 for A-B and B-A then enter these into a SIMPLE REGRESSION
model to correlate with the psych score [1].
I'm not sure what contrast I would use to show A>B correlated with a pych score
if I used a MULTIPLE REGRESSION analysis with 4 covariates. Could it be [1 -1 1
-1](A>B) and [-1 1 -1 1](B>A) for:
1) 15X1 15x0
2) 15x0 15X1
3) 15 psych scores 15X0
4) 15X0 followed by 15 psych scores
Comments on the above and the best approach would be greatly appreciated.
Thank you for your time,
Maria
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