A mediator is on a causal (or mediating) pathway, and all arrows point from exposure to outcome with the mediator in between.
Understand the Problem
The question is discussing the concept of a mediator in a causal pathway, specifically how it functions in research contexts where the mediator transmits effects from an exposure to an outcome. This involves understanding the relationships between the variables and the directional flow indicated by arrows.
Answer
A mediator is a variable on the causal pathway between exposure and outcome.
A mediator is a variable on the causal pathway between an exposure and an outcome, meaning it is influenced by the exposure and, in turn, affects the outcome.
Answer for screen readers
A mediator is a variable on the causal pathway between an exposure and an outcome, meaning it is influenced by the exposure and, in turn, affects the outcome.
More Information
Mediators help in understanding the mechanisms through which a particular exposure influences an outcome, essential for identifying potential intervention points.
Tips
A common mistake is confusing mediators with confounders. While both can affect the relationship between exposure and outcome, mediators are influenced by the exposure, unlike confounders.
Sources
- A Brief Primer on Conducting Regression-Based Causal Mediation ... - pmc.ncbi.nlm.nih.gov
- Causal Mediation | Columbia University Mailman School of Public ... - publichealth.columbia.edu
