Package: nlpsem
Type: Package
Title: Nonlinear Longitudinal Process in Structural Equation Modeling
Version: 1.0.0
Authors@R: c(person(given = "Jin",
           family = "Liu",
           role = c("aut", "cre"),
           email = "Veronica.Liu0206@gmail.com",
           comment = c(ORCID = "0000-0001-5922-6643")))
Description: Provides computational tools for nonlinear longitudinal models, in particular the intrinsically nonlinear models, in four scenarios: (1) univariate longitudinal processes with growth factors, with or without covariates including time-invariant covariates (TICs) and time-varying covariates (TVCs); (2) multivariate longitudinal processes that facilitate the assessment of associations and directional relationships between multiple longitudinal variables; (3) multiple-group models for scenarios (1) and (2) to evaluate differences among manifested groups, and (4) longitudinal mixture models for scenarios (1) and (2), with an assumption that trajectories are from multiple latent classes. Data can also be simulated from these models with the generating parameter values attached. The methods implemented are introduced in Liu (2025) <doi:10.3758/s13428-025-02596-4>.
License: GPL (>= 3)
Encoding: UTF-8
LazyData: true
Depends: R (>= 4.0.0), OpenMx (>= 2.21.8)
Imports: ggplot2, dplyr, tidyr, stringr, Matrix, nnet, methods,
        grDevices, graphics, stats, utils, rlang (>= 0.4.0)
RoxygenNote: 7.3.3
URL: https://github.com/Veronica0206/nlpsem
BugReports: https://github.com/Veronica0206/nlpsem/issues
Suggests: testthat (>= 3.2.0), knitr, rmarkdown
VignetteBuilder: knitr
Config/testthat/edition: 3
NeedsCompilation: no
Packaged: 2026-11-01 23:57:40 UTC; runner
Author: Jin Liu [aut, cre] (ORCID: <https://orcid.org/0000-0001-5922-6643>)
Maintainer: Jin Liu <Veronica.Liu0206@gmail.com>
Repository: CRAN
Date/Publication: 2026-11-02 03:30:02 UTC
