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Extract formula from fitted galamm object

Usage

# S3 method for galamm
formula(x, ...)

Arguments

x

Object of class galamm returned from galamm.

...

Optional arguments passed on to other methods. Currently not used.

Value

The formula used to fit the model.

Examples

# Mixed response model ------------------------------------------------------

# The mresp dataset contains a mix of binomial and Gaussian responses.

# We need to estimate a factor loading which scales the two response types.
loading_matrix <- matrix(c(1, NA), ncol = 1)

# Define mapping to families.
families <- c(gaussian, binomial)
family_mapping <- ifelse(mresp$itemgroup == "a", 1, 2)


# Fit the model
mod <- galamm(
  formula = y ~ x + (0 + level | id),
  data = mresp,
  family = families,
  family_mapping = family_mapping,
  factor = "level",
  load.var = "itemgroup",
  lambda = loading_matrix
)

# Formula
formula(mod)
#> y ~ x + (0 + level | id)