Estimating and testing mediation and moderation in within-subject designs

Analyses designed to detect mediation and moderation of treatment effects are increasingly prevalent in research in psychology. The mediation question concerns the processes that produce a treatment effect. The moderation question concerns factors that affect the magnitude of that effect. Although a...

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Bibliographic Details
Published inPsychological methods Vol. 6; no. 2; p. 115
Main Authors Judd, C M, Kenny, D A, McClelland, G H
Format Journal Article
LanguageEnglish
Published United States 01.06.2001
Subjects
Data Interpretation, Statistical
Humans
Mental Disorders - therapy
Outcome and Process Assessment (Health Care) - statistics & numerical data
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Summary:Analyses designed to detect mediation and moderation of treatment effects are increasingly prevalent in research in psychology. The mediation question concerns the processes that produce a treatment effect. The moderation question concerns factors that affect the magnitude of that effect. Although analytic procedures have been reasonably well worked out in the case in which the treatment varies between participants, no systematic procedures for examining mediation and moderation have been developed in the case in which the treatment varies within participants. The authors present an analytic approach to these issues using ordinary least squares estimation.
ISSN:1082-989X
DOI:10.1037/1082-989X.6.2.115