bfgs {lessSEM}

bfgs

Description

This function allows for optimizing models built in lavaan using the BFGS optimizer implemented in lessSEM. Its elements can be accessed with the "@" operator (see examples). The main purpose is to make transformations of lavaan models more accessible.

Usage

bfgs(
  lavaanModel,
  modifyModel = lessSEM::modifyModel(),
  control = lessSEM::controlBFGS()
)

Arguments

lavaanModel

model of class lavaan

modifyModel

used to modify the lavaanModel. See ?modifyModel.

control

used to control the optimizer. See ?controlBFGS for more details.

Value

Model of class regularizedSEM

Examples

library(lessSEM)

# Identical to regsem, lessSEM builds on the lavaan
# package for model specification. The first step
# therefore is to implement the model in lavaan.

dataset <- simulateExampleData()

lavaanSyntax <- "
f =~ l1*y1 + l2*y2 + l3*y3 + l4*y4 + l5*y5 +
     l6*y6 + l7*y7 + l8*y8 + l9*y9 + l10*y10 +
     l11*y11 + l12*y12 + l13*y13 + l14*y14 + l15*y15
f ~~ 1*f
"

lavaanModel <- lavaan::sem(lavaanSyntax,
                           data = dataset,
                           meanstructure = TRUE,
                           std.lv = TRUE)


lsem <- bfgs(
  # pass the fitted lavaan model
  lavaanModel = lavaanModel)

# the coefficients can be accessed with:
coef(lsem)

# elements of lsem can be accessed with the @ operator:
lsem@parameters