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Prev Sci. 2009 Jun;10(2):87-99. doi: 10.1007/s11121-008-0109-6.

A general model for testing mediation and moderation effects.

Author information

  • 1Department of Psychology, University of South Carolina, Barnwell College, 1512 Pendleton St., Columbia, SC 29208, USA. afairchi@mailbox.sc.edu

Abstract

This paper describes methods for testing mediation and moderation effects in a dataset, both together and separately. Investigations of this kind are especially valuable in prevention research to obtain information on the process by which a program achieves its effects and whether the program is effective for subgroups of individuals. A general model that simultaneously estimates mediation and moderation effects is presented, and the utility of combining the effects into a single model is described. Possible effects of interest in the model are explained, as are statistical methods to assess these effects. The methods are further illustrated in a hypothetical prevention program example.

PMID:
19003535
[PubMed - indexed for MEDLINE]
PMCID:
PMC2908713
Free PMC Article
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