`lavaan` is the LAtent VAriable ANalysis package in R used for structural equation modeling

lavaan is R package for latent variable modeling $\approx$ structural equation modeling (and related techniques such as simultaneous equations, mediation/moderation analysis, etc.)

See the main project page: http://lavaan.ugent.be/ and CRAN page: https://cran.r-project.org/web/packages/lavaan/index.html.

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