Hello everybody,
I'm performing a VBM analysis on three groups.
I look first at simple group differences between the three groups but I don't find results.
I perform then the so called "Two Groups with continuous covariate interaction", adding the performance to tests as covariates as explained in the webpage, and I do find differences between the three groups in function of their performance.
Now, my question is: does it make sense if I comment these results without having any group difference? And how can an interpretation can be?
Thank you for your reply,
Davide
PS: The two GLM are different and in the first one I don't add any covariate.
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