[R-pkgs] OpenMX structural equation software

From: John Fox <jfox_at_mcmaster.ca>
Date: Mon, 18 Oct 2010 09:18:22 -0400

Dear R users,

The OpenMx developer team takes great pride in announcing the availability of OpenMx 1.0. The team would like to express its gratitude to the large number of beta-testers who have helped us improve the code. Thank you.

OpenMx is a free suite of R functions and a estimation back-end that supports fitting a wide variety of structural equation models including multiple groups, full information ML for missing data, ordinal estimation with thresholds, multilevel, latent class, and mixture distributions to name a few.

The most current version of OpenMx (for Mac, Windows and most Linux variants) may be downloaded by issuing the following R command:


OpenMx is not currently hosted on CRAN due to a license restriction on the one portion of our code, an optimizer, that was not written by the project. We hope to remedy this situation reasonably soon as we are working on an open source version of the optimizer. The remainder of the project is licensed under Apache 2.0 and the source code may be downloaded from the OpenMx website and used for any purpose you wish. We do hope that you wish to contribute improvements or bug fixes back to the project, but we do not require it.

The OpenMx website is http://openmx.psyc.virginia.edu, where we host a set of manuals and tutorials, a wiki, and a set of user forums where issues to do with OpenMx and SEM in general can be discussed. We require free registration in order to post to the forums or wiki so as to slow down the spambots, but everything else is available without registration.

OpenMx has been in development for 3 years. The OpenMx beta test program began in October 2009. Since then, we have improved the interface and sped up the optimization times considerably. Many new features are in the works and we encourage you to post to the Wish List forum so that we know what you would like to see.

>From this point on, we will maintain two binary releases: a stable release
numbered as 1.x.x, and a development binary with the latest and greatest features and bug-fixes, numbered with the current revision number (e.g., 1448). The development of OpenMx is on-going and we expect that new development binaries will be released often. The stable releases are likely to be updated every few months or so.

For the OpenMx team.


John Fox
Senator William McMaster
  Professor of Social Statistics
Department of Sociology
McMaster University
Hamilton, Ontario, Canada
web: socserv.mcmaster.ca/jfox

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