Differences between moderated mediation and mediated moderation They also proposed that a moderator variable D could moderate the effect of A on B, while a different moderator E moderates the effect of B on C. In addition to the three manners proposed by Muller and colleagues in which moderated mediation can occur, Preacher, Rucker, and Hayes (2007) proposed that the independent variable A itself can moderate the effect of the mediator B on the outcome variable C. Type 2 moderation, however, is more statistically difficult, so Langfred reviews three different possible approaches for the analysis, and ultimately recommends one of them as the correct technique.Ĭonceptual diagram of a moderated mediation process model in which one variable (D) moderates the relationship between the independent variable (A) and the mediator variable (B) and a second variable (E) moderates the relationship between the mediator variable (B) and the outcome variable (C). Langfred reviews the existing perspectives on moderated mediation (James and Brett, 1984), and notes that an accepted statistical approach already exists for Type 1 moderated mediation, as demonstrated by Korsgaard, Brodt, and Whitener (2002). Type 1, in which the moderator operates on the relationship between the independent variable and the mediator, and Type 2, in which the moderator operates on the relationship between the mediator and the dependent variable. īecause there was no established procedure to analyze models with moderated mediation, Langfred (2004) first describes the different types of moderated mediation models that might exist, noting that there are two primary forms of moderated mediation. Langfred (2004) was the first to provide a comprehensive treatment of the question of how to conceptualize moderated mediation, classify different types of moderated mediation models, and to develop the logic and methodology for the statistical analysis of such models using multiple regression. 4 Differences between moderated mediation and mediated moderation. ![]() 3 Additions by Preacher, Rucker, and Hayes (2007).
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