How to Do Mediation Scientifically

Mediation analysis has been around a long time, though its popularity has varied between disciplines and over the years. While some fields have been attracted to the potential of mediation models to identify pathways, or mechanisms, through which an independent variable affects an outcome, others have been skeptical that the analysis of mediated relationships can ever be done scientifically. Two developments, one more scientific than the other, have led to a renewed popularity of mediation analysis.
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