calc_lrt: Lo-Mendell-Rubin likelihood ratio test

In tidyLPA: Easily Carry Out Latent Profile Analysis (LPA) Using Open-Source or Commercial Software

Description

Implements the ad-hoc adjusted likelihood ratio test (LRT) described in Formula 15 of Lo, Mendell, & Rubin (2001), or LMR LRT.

Usage

calc_lrt(n, null_ll, null_param, null_classes, alt_ll, alt_param, alt_classes)

Arguments

n	Integer. Sample size
null_ll	Numeric. Log-likelihood of the null model.
null_param	Integer. Number of parameters of the null model.
null_classes	Integer. Number of classes of the null model.
alt_ll	Numeric. Log-likelihood of the alternative model.
alt_param	Integer. Number of parameters of the alternative model.
alt_classes	Integer. Number of classes of the alternative model.

Value

A numeric vector containing the likelihood ratio LR, the ad-hoc corrected LMR, degrees of freedom, and the LMR p-value.

References

Lo Y, Mendell NR, Rubin DB. Testing the number of components in a normal mixture. Biometrika. 2001;88(3):767–778. doi:10.1093/biomet/88.3.767

Examples

calc_lrt(150L, -741.02, 8, 1, -488.91, 13, 2)

Example output

You can use the function citation('tidyLPA') to create a citation for the use of {tidyLPA}.
Mplus is not installed. Use only package = 'mclust' when calling estimate_profiles().
Warning message:
In system2("type", args = "mplus", stdout = FALSE, stderr = FALSE) :
  error in running command
Lo-Mendell-Rubin ad-hoc adjusted likelihood ratio rest:

LR = 504.220, LMR LR (df = 5) = 472.769, p < 0.001

tidyLPA documentation built on Nov. 17, 2021, 5:07 p.m.