R2 effect-size measures for mediation analysis

Amanda J. Fairchild, David Mackinnon, Marcia P. Taborga, Aaron B. Taylor

Research output: Contribution to journalArticlepeer-review

239 Scopus citations


R2 effect-size measures are presented to assess variance accounted for in mediation models. The measures offer a means to evaluate both component paths and the overall mediated effect in mediation models. Statistical simulation results indicate acceptable bias across varying parameter and sample-size combinations. The measures are applied to a real-world example using data from a team-based health promotion program to improve the nutrition and exercise habits of firefighters. SAS and SPSS computer code are also provided for researchers to compute the measures in their own data.

Original languageEnglish (US)
Pages (from-to)486-498
Number of pages13
JournalBehavior Research Methods
Issue number2
StatePublished - May 2009

ASJC Scopus subject areas

  • Experimental and Cognitive Psychology
  • Developmental and Educational Psychology
  • Arts and Humanities (miscellaneous)
  • Psychology (miscellaneous)
  • General Psychology


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