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When moderation is mediated and mediation is moderated
Dominique Muller1, Charles M Judd, Vincent Y Yzerbyt
1Université Paris Descartes, Boulogne Billancourt, France. dominique.muller@univ-paris5.fr
Abstract:
Procedures for examining whether treatment effects on an outcome are mediated and/or moderated have been well developed and are routinely applied. The mediation question focuses on the intervening mechanism that produces the treatment effect. The moderation question focuses on factors that affect the magnitude of the treatment effect. It is important to note that these two processes may be combined in informative ways, such that moderation is mediated or mediation is moderated. Although some prior literature has discussed these possibilities, their exact definitions and analytic procedures have not been completely articulated. The purpose of this article is to define precisely both mediated moderation and moderated mediation and provide analytic strategies for assessing each.
Insights
This study clarifies mediated moderation and moderated mediation, which combine treatment effect mechanisms and influencing factors. It provides precise definitions and analytic strategies for these complex statistical interactions.
Area of Science:
- Psychometrics
- Statistical modeling
- Behavioral science
Background:
- Established methods exist for analyzing treatment effect mediation and moderation separately.
- Mediation examines intervening mechanisms, while moderation assesses factors influencing effect magnitude.
- Combined processes like mediated moderation and moderated mediation require clearer definitions and analytical approaches.
Purpose of the Study:
- To precisely define mediated moderation and moderated mediation.
- To present novel analytic strategies for assessing these combined statistical phenomena.
- To advance understanding of complex treatment effect interactions.
Main Methods:
- Conceptual clarification of mediated moderation and moderated mediation.
- Development of statistical frameworks for their assessment.
- Review of existing literature on combined mediation and moderation.
Main Results:
- Precise definitions for mediated moderation and moderated mediation are provided.
- Analytic strategies for assessing these combined effects are articulated.
- The study establishes a foundation for empirical research on these complex interactions.
Conclusions:
- Clear definitions and analytic methods are crucial for studying mediated moderation and moderated mediation.
- These complex interactions offer deeper insights into treatment effects.
- Further research is needed to fully explore the implications of these statistical models.
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