#
Structural Equation Models (sem)

**sem** is an

R package for fitting
structural-equation models. The package supports general structural equation
models with latent varibles, fit by maximum likelihood assuming multinormality and generalized least squares,
and single-equation estimation for observed-variable models by two-stage least.squares.
There is support for computing robust standard errors and tests, and for multi-group models.

The **sem** package is available on the Comprehensive R Achive Network (CRAN).

For more information (now quite out of date), see J. Fox (2006), "Structural
Equation Modeling With the sem Package in R."
*Structural Equation Modeling*, 13:465-486, and the package help pages, which include many examples.

The current version of the **sem** package was written by John Fox, Zhenghua Nie, and Jarrett Byrnes.

Please address comments, questions, and suggestions to * jfox
AT mcmaster.ca.*

*Last Modified: 8 September 2012 by John Fox, jfox
AT mcmaster.ca.*