I have conducted a multi-level regression analysis and some of the predictors are correlated significantly with each other (r < .30). I read that this is nearly normally in multi level regression analyses.
I am wondering if there could be a suppression effect. Can anyone tell me, how to test it? In this line, what do I have to do in the case of suppression?
Following, I want to conduct mediation analyses. Do I have to include all predictors in the case of a suppression?
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