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Required sample size to detect the mediated effect.

Matthew S Fritz1, David P Mackinnon

  • 1Department of Psychology, Arizona State University, Box 871104, Tempe, AZ 85287-1104, USA. matt.fritz@asu.edu

Psychological Science
|April 21, 2007
PubMed
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Researchers can now determine the precise sample sizes needed for mediation analysis. This guide offers sample size calculations for six common mediation tests, aiding study design and grant applications.

Area of Science:

  • Psychological science
  • Statistical modeling

Background:

  • Mediation models are frequently employed in research to understand indirect effects.
  • Determining adequate sample size for mediation testing is a critical, yet often challenging, aspect of study design.

Purpose of the Study:

  • To provide researchers with essential sample size information for planning mediation studies.
  • To offer guidance on achieving adequate statistical power for common mediation effect tests.

Main Methods:

  • The study outlines sample size requirements for six widely recommended mediation tests.
  • Calculations are presented for various parameter combinations to ensure comprehensive guidance.

Main Results:

  • Specific sample size recommendations are detailed for different mediation testing scenarios.

Related Experiment Videos

  • The findings facilitate informed decisions regarding participant recruitment and resource allocation.

    • Conclusions:

    • This resource serves as a practical guide for researchers designing mediation studies.
    • Ensuring appropriate sample sizes enhances the reliability and validity of mediation effect findings.