Required Sample Size to Detect the Mediated Effect

Mediation models are widely used, and there are many tests of the mediated effect. One of the most common questions that researchers have when planning mediation studies is, "How many subjects do I need to achieve adequate power when testing for mediation?" This article presents the necess...

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Bibliographic Details
Published inPsychological science Vol. 18; no. 3; pp. 233 - 239
Main Authors Fritz, Matthew S., MacKinnon, David P.
Format Journal Article
LanguageEnglish
Published Los Angeles, CA Blackwell Publishing 01.03.2007
SAGE Publications
SAGE PUBLICATIONS, INC
Subjects
Causality
Clinical psychology
Coefficients
Computer software
Confidence interval
Confidence limits
Grants
Humans
Mathematical independent variables
Mediation
Methodology
Models, Statistical
Power
Psychology, Experimental - statistics & numerical data
Research methodology
Research methods
Researchers
Sample Size
Samples
Social psychology
Social research
Social sciences
Standard error
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Summary:Mediation models are widely used, and there are many tests of the mediated effect. One of the most common questions that researchers have when planning mediation studies is, "How many subjects do I need to achieve adequate power when testing for mediation?" This article presents the necessary sample sizes for six of the most common and the most recommended tests of mediation for various combinations of parameters, to provide a guide for researchers when designing studies or applying for grants.
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ISSN:0956-7976
1467-9280
DOI:10.1111/j.1467-9280.2007.01882.x