Structural Equation Modeling Using the Reticular Action Model (RAM) Notation

We rewrite of RAMpath software developed by John McArdle and Steven Boker as an R package. In addition to performing regular SEM analysis through the R package lavaan, RAMpath has unique features. First, it can generate path diagrams according to a given model. Second, it can display path tracing rules through path diagrams and decompose total effects into their respective direct and indirect effects as well as decompose variance and covariance into individual bridges. Furthermore, RAMpath can fit dynamic system models automatically based on latent change scores and generate vector field plots based upon results obtained from a bivariate dynamic system. Starting version 0.4, RAMpath can conduct power analysis for both univariate and bivariate latent change score models.


Reference manual

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0.4 by Zhiyong Zhang, 5 years ago

Browse source code at

Authors: Zhiyong Zhang , Jack McArdle , Aki Hamagami , & Kevin Grimm

Documentation:   PDF Manual  

GPL-2 license

Depends on lavaan, ellipse, MASS

See at CRAN