Commentary on "Mediation analysis and categorical variables: The final frontier" by Dawn Iacobucci

David Mackinnon, Matthew G. Cox

Research output: Contribution to journalArticle

29 Scopus citations


The commentary discusses several topics in Dr. Iacobucci's article on mediation analysis with categorical variables including the lack of equivalency of mediated effect measures, ab, and c- c', that are algebraically equivalent in ordinary least squares regression models. The commentary raises the issue of correlated mediation coefficients and presents formulas to include the correlation in the test of significance. References to new developments in causal mediation analysis for categorical variables are given and the importance of programs of research to establish a mediation theory is emphasized.

Original languageEnglish (US)
Pages (from-to)600-602
Number of pages3
JournalJournal of Consumer Psychology
Issue number4
StatePublished - Oct 1 2012



  • Categorial data analysis
  • Indirect effects
  • Mediation

ASJC Scopus subject areas

  • Applied Psychology
  • Marketing

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