title: OpenMx 2.0: Extended Structural Equation and Statistical Modeling.
abstract: The new software package OpenMx 2.0 for structural equation and other statistical modeling is introduced and its features are described. OpenMx is evolving in a modular direction and now allows a mix-and-match computational approach that separates model expectations from fit functions and optimizers. Major backend architectural improvements include a move to swappable open-source optimizers such as the newly written CSOLNP. Entire new methodologies such as item factor analysis and state space modeling have been implemented. New model expectation functions including support for the expression of models in LISREL syntax and a simplified multigroup expectation function are available. Ease-of-use improvements include helper functions to standardize model parameters and compute their Jacobian-based standard errors, access to model components through standard R $ mechanisms, and improved tab completion from within the R Graphical User Interface.
authors.affiliation: Virginia Institute for Psychiatric and Behavioral Genetics, Virginia Commonwealth University, Richmond, USA. neale@vcu.edu.
authors.forename: Michael C
authors.initials: MC
authors.lastname: Neale
authors.affiliation: Department of Psychology, University of Oklahoma, Norman, USA.
authors.forename: Michael D
authors.initials: MD
authors.lastname: Hunter
authors.affiliation: Department of Psychology, University of Virginia, Charlottesville, USA.
authors.forename: Joshua N
authors.initials: JN
authors.lastname: Pritikin
authors.affiliation: Department of Computer Science, Virginia Commonwealth University, Richmond, USA.
authors.forename: Mahsa
authors.initials: M
authors.lastname: Zahery
authors.affiliation: Department of Human Development and Family Studies, Pennsylvania State University, State College, USA.
authors.forename: Timothy R
authors.initials: TR
authors.lastname: Brick
authors.affiliation: Virginia Institute for Psychiatric and Behavioral Genetics, Virginia Commonwealth University, Richmond, USA.
authors.forename: Robert M
authors.initials: RM
authors.lastname: Kirkpatrick
authors.affiliation: Department of Medical Social Sciences, Northwestern University, Evanston, USA.
authors.forename: Ryne
authors.initials: R
authors.lastname: Estabrook
authors.affiliation: Department of Psychology, University of Edinburgh, Edinburgh, USA.
authors.forename: Timothy C
authors.initials: TC
authors.lastname: Bates
authors.affiliation: Virginia Institute for Psychiatric and Behavioral Genetics, Virginia Commonwealth University, Richmond, USA.
authors.forename: Hermine H
authors.initials: HH
authors.lastname: Maes
authors.affiliation: Department of Psychology, University of Virginia, Charlottesville, USA.
authors.forename: Steven M
authors.initials: SM
authors.lastname: Boker
mesh_terms: D005163:Factor Analysis, Statistical; D006801:Humans; D015233:Models, Statistical; D011594:Psychometrics; D012984:Software; D013223:Statistics as Topic
keywords: behavior genetics; big data; full information maximum likelihood; item factor analysis; latent class analysis; mixture distribution; optimization; ordinal data; path analysis; state space modeling; structural equation modeling; substance use data analysis; time series