what is the main deference between mediation and moderation, why to use mediation? why use moderation?
in which case the best to use mediation and moderation
please provide articles if you can
Below are two articles that define both and provide examples. The Muller definition states that mediation is when a variable is "responsible for the casual effect" (i.e. variable B is the mechanism explaining why A is related to C). On the other hand, a moderating variable may change "the magnitude of the casual effect" (most commonly associated with interaction effects).
Muller, D., Judd, C. M., & Yzerbyt, V. Y. (2005). When moderation is mediated and mediation is moderated. Journal of personality and social psychology, 89(6), 852.
Preacher, K. J., Rucker, D. D., & Hayes, A. F. (2007). Addressing moderated mediation hypotheses: Theory, methods, and prescriptions. Multivariate behavioral research, 42(1), 185-227.
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