The Onyx team is happy to announce the release of Onyx, a Structural Equation Modeling
(SEM) Graphical User Interface designed to set up and fit SEMs intuitively
and fast, ease the introduction of Structural Equation Models for beginners,
and simplify the transistion to more complex SEM scripting languages. Onyx
is developed in cooperation of the Mathematical Psychology Lab at UVa and
the Formal Methods Project at the Max Planck Institute for Human
Onyx provides import from and export to OpenMx, a free SEM package for R.
Also, publication-quality figures can be exported in a vector representation
to LaTeX or in a JPEG image file. Furthemore, Onyx provides a powerful
backend for performing maximum likelihood estimation.
Onyx is intended to be a teaching tool for SEM. It facilitates a graphical
approach to modeling that also offers an interface to OpenMx and Mplus code.
That is, SEMs can be taught in a graphical approach without the need to
teach a specific modeling language. In the progress of a course, a
transition from the purely graphical approach to a specific modeling
language can be made using exports to OpenMx or to MPlus. An interactive
code view allows users to track and compare changes to the model
specification in the selected language that are elicited by changes to the
You can download Onyx for free at http://onyx.brandmaier.de. You can find a
brief user guide at http://onyx.brandmaier.de/userguide.pdf. If you have any
questions or issues regarding Onyx, please don't hesitate to e-mail
firstname.lastname@example.org or email@example.com.