What is a mediated moderation model?

In statistics, moderation and mediation can occur together in the same model. Moderated mediation, also known as conditional indirect effects, occurs when the treatment effect of an independent variable A on an outcome variable C via a mediator variable B differs depending on levels of a moderator variable D.

Can a moderator be mediated?

Although mediators and moderators can be integrated, it should be very clear that mediators and moderators are unique—the terms cannot be used interchangeably.

How do you measure moderation?

Moderation can be tested by looking for significant interactions between the moderating variable (Z) and the IV (X). Notably, it is important to mean center both your moderator and your IV to reduce multicolinearity and make interpretation easier.

What is index of moderated mediation?

The index of moderated mediation is a direct quantification of the linear association between the indirect effect and the putative moderator of that effect. Second, the number of inferential statistical tests employed used to substantiate a claim should be kept as small as possible.

How do you explain mediation effect?

If a mediation effect exists, the effect of X on Y will disappear (or at least weaken) when M is included in the regression. The effect of X on Y goes through M. If the effect of X on Y completely disappears, M fully mediates between X and Y (full mediation).

What is a mediated moderation and how does it work?

A mediated moderation then exists if this moderator effect is applied to an indirect path from the IV to the DV via a mediator (MED). So there is an indirect effect, the strength of which depends on the moderator and therefore the strength of the overall effect depends on the moderator.

Are there different types of moderated mediation models?

Because 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.

What are the regression equations for moderated mediation?

The following regression equations are fundamental to their model of moderated mediation, where A = independent variable, C = outcome variable, B = mediator variable, and D = moderator variable. This equation assesses moderation of the overall treatment effect of A on C.

What is the Langfred model of 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.