getsub.TVC_l: Define a Latent Growth Curve Model or Latent Change Score...

In nlpsem: Linear and Nonlinear Longitudinal Process in Structural Equation Modeling Framework

Define a Latent Growth Curve Model or Latent Change Score Model with a Time-varying Covariate as Class-specific Models (Submodels) for a Longitudinal Mixture Model.

Description

This function defines a latent growth curve model or latent change score model with time-varying covariate as class- specific models (submodels) for a longitudinal mixture model.

Usage

getsub.TVC_l(
  dat,
  nClass,
  t_var,
  records,
  y_var,
  curveFun,
  intrinsic,
  y_model,
  TVC,
  decompose,
  growth_TIC,
  starts
)

Arguments

dat	A wide-format data frame, with each row corresponding to a unique ID. It contains the observed variables with repeated measurements and occasions for each longitudinal process, and time-invariant covariates (TICs) if any. It takes the value passed from getMIX().
nClass	An integer specifying the number of latent classes for the mixture model. It takes the value passed from getMIX().
t_var	A string specifying the prefix of the column names corresponding to the time variable at each study wave. It takes the value passed from getMIX().
records	A numeric vector specifying the indices of the observed study waves. It takes the value passed from getMIX().
y_var	A string specifying the prefix of the column names corresponding to the outcome variable at each study wave. It takes the value passed from getMIX().
curveFun	A string specifying the functional form of the growth curve. Supported options for y_model = "LGCM" include: "linear" (or "LIN"), "quadratic" (or "QUAD"), "negative exponential" (or "EXP"), "Jenss-Bayley" (or "JB"), and "bilinear spline" (or "BLS"). Supported options for y_model = "LCSM" include: "quadratic" (or "QUAD"), "negative exponential" (or "EXP"), "Jenss-Bayley" (or "JB"), and "nonparametric" (or "NonP"). It takes the value passed from getMIX().
intrinsic	A logical flag indicating whether to build an intrinsically nonlinear longitudinal model. It takes the value passed from getMIX().
y_model	A string specifying how to fit the longitudinal outcome. Supported values are "LGCM" and "LCSM". It takes the value passed from getMIX().
TVC	A string specifying the prefix of the column names corresponding to the time-varying covariate at each study wave. It takes the value passed from getMIX().
decompose	An integer specifying the decomposition option for temporal states. Supported values include 0 (no decomposition), 1 (decomposition with interval-specific slopes as temporal states), 2 (decomposition with interval- specific changes as temporal states), and 3 (decomposition with change-from-baseline as temporal states). It takes the value passed from getMIX().
growth_TIC	A string or character vector specifying the column name(s) of time-invariant covariate(s) that account for the variability of growth factors, if any. It takes the value passed from getMIX().
starts	A list of initial values for the parameters, either takes the value passed from getMIX() or derived by the helper function getMIX.initial().

Value

A list of manifest and latent variables and paths for an mxModel object.

nlpsem documentation built on Sept. 13, 2023, 1:06 a.m.