semlbci (version 0.11.5)

set_constraint: Equality Constraint for Finding the LBCI by Wu-Neale-2012

Description

Create the equality constraint for finding the likelihood-based confidence interval (LBCI) by the Wu-Neale-2012 method.

Usage

set_constraint(sem_out, ciperc = 0.95)

Value

An equality constraint function to be used by ci_bound_wn_i().

Arguments

sem_out

The SEM output. Currently supports lavaan::lavaan outputs only.

ciperc

The intendeted coverage probability of the confidence interval. Default is .95.

Details

Important Notice

This function is not supposed to be used directly by users in typical scenarios. Its interface is user-unfriendly because it should be used through semlbci(). It is exported such that interested users can examine how a confidence bound is found, or use it for experiments or simulations.

Usage

The Wu-Neale-2012 method uses a simple objective function that is optimized with an equality constraint. set_constraint() generates the equality constraint function to be used by ci_bound_wn_i().

It currently supports lavaan::lavaan outputs only.

Examples

library(lavaan)
data(simple_med)
dat <- simple_med
mod <-
"
m ~ x
y ~ m
"
fit_med <- sem(mod, simple_med, fixed.x = FALSE)

fn_constr0 <- set_constraint(fit_med)
out <- fn_constr0(coef(fit_med), sem_out = fit_med)
out
lavTech(fit_med, "optim")$fx