mediator variable

Formal Definition

An entity or process that intervenes between input and output. a variable functions as a mediator to the extent that it accounts for the relation between the predictor and the outcome. Whereas moderator variables specify when certain effects will hold, mediators speak to how or why such effects occur.

Baron, R.M., & Kenny, D.A. (1986). The moderator-mediator variable distinction in social psychological research: Conceptual, strategic, and statistical considerations. Journal of Personality & Social Psychology, 51, 1173-1182
  • Categories: Statistics