In the previous tutorials we looked at various applications of the linear model. We move on now to explore the concept of mediation. Perfect mediation occurs when the relationship between a predictor variable and an outcome variable can be completely explained by their relationships with a third variable. For example, taking a dog to work reduces work stress. This relationship would be mediated by positive mood if (1) having a dog at work increase positive mood; (2) positive mood reduces work stress; and (3) the relationship between having a dog at work and work stress is reduced to zero (or at least weakened) when positive mood is included in the model.


Video Tutorial

Mediation using IBM SPSS Statistics

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