OpenMx: An Open Source Extended Structural Equation Modeling Framework

Steven Boker*, Michael Neale, Hermine Maes, Michael Wilde, Michael Spiegel, Timothy Brick, Jeffrey Spies, Ryne Estabrook, Sarah Kenny, Timothy Bates, Paras Mehta, John Fox

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

697 Scopus citations


OpenMx is free, full-featured, open source, structural equation modeling (SEM) software. OpenMx runs within the R statistical programming environment on Windows, Mac OS-X, and Linux computers. The rationale for developing OpenMx is discussed along with the philosophy behind the user interface. The OpenMx data structures are introduced-these novel structures define the user interface framework and provide new opportunities for model specification. Two short example scripts for the specification and fitting of a confirmatory factor model are next presented. We end with an abbreviated list of modeling applications available in OpenMx 1.0 and a discussion of directions for future development.

Original languageEnglish (US)
Pages (from-to)306-317
Number of pages12
Issue number2
StatePublished - Apr 1 2011


  • OpenMx
  • SEM
  • open source
  • software
  • structural equation modeling

ASJC Scopus subject areas

  • Psychology(all)
  • Applied Mathematics

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