Define variables as ordinal in latent variable model object
ordinal(x, ...) <- valueObject
additional arguments to lower level functions
variable (formula or character vector)
if (requireNamespace("mets")) {
m <- lvm(y + z ~ x + 1*u[0], latent=~u)
ordinal(m, K=3) <- ~y+z
d <- sim(m, 100, seed=1)
e <- estimate(m, d)
}