Dear SPM experts,
I have some doubts regarding the usage of covariates at the second-level analysis. We have an experiment with two groups and two performance measures for both groups. We would like to include the performance measures as covariates in our model to test for the effects of the group and the covariates. The problem is that our performance measures are highly colinear. Is it correct to include these covariates? Can we infer about the effects of each covariate?
Thanks.
Best regards,
Paulo Marques.
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