Build a UMG from a lavaan model — umg_from

Translates a lavaan parameter table into a UMG: latent variables (=~ left-hand sides) become latent continuous vertices, observed indicators become observed continuous vertices, loadings and regressions become dep edges, off-diagonal ~~ rows become cov edges, and diagonal ~~ rows are carried as variance annotations. Intercept and mean rows (~1) are carried as mean annotations on the vertex (mean = free, mean = 0, mean = <value>, or mean = fixed when lavaan fixes the mean at a sample value, as for exogenous covariates under fixed.x = TRUE), so that a model's mean structure survives the round trip through umg_to_lavaan(). A single person plate is added over all random vertices, making explicit the replication that classic SEM diagrams leave implicit.

Usage

umg_from_lavaan(object, plate_index = "i = 1, ..., N", bayesian = FALSE)

Arguments

object: A fitted lavaan object, or a lavaan model syntax string (which is then lavaanified without fitting).
plate_index: Index label for the person plate.
bayesian: Logical; if TRUE, free parameters are rendered in their prior-closed (Bayesian) form. Defaults to FALSE. Used by umg_from_blavaan().

Value

An object of class umg.