Package: MultiSpline
Type: Package
Title: Spline-Based Nonlinear Modeling for Multilevel and Longitudinal
        Data
Version: 0.3.0
Authors@R: person(given = "Subir",
                  family = "Hait",
                  email = "haitsubi@msu.edu",
                  role = c("aut", "cre"),
                  comment = c(ORCID = "0009-0004-9871-9677"))
Description: Provides a unified framework for fitting, predicting, and
        interpreting nonlinear relationships in single-level,
        multilevel, and longitudinal regression models. Flexible
        functional forms are supported using natural cubic splines
        ('splines'), B-splines ('splines'), and GAM smooths ('mgcv').
        Supports two-way and nested clustering via 'lme4', automatic
        knot selection by AIC or BIC, multilevel R-squared
        decomposition (marginal and conditional R-squared of Nakagawa
        and Schielzeth (2013) <doi:10.1111/j.2041-210x.2012.00261.x>,
        extended to random slopes as in Johnson (2014)
        <doi:10.1111/2041-210X.12225>, with level-specific variance
        partitioning), a postestimation suite returning first and
        second derivatives with confidence bands, turning points and
        inflection regions, and a model comparison workflow contrasting
        linear, polynomial, and spline fits by AIC, BIC, and
        likelihood-ratio tests. Cluster heterogeneity in nonlinear
        effects is supported via random-slope spline terms. Any 'lme4'
        random-effects structure can be supplied, and
        population-averaged (marginal) curves are available for
        generalized linear mixed models.
Depends: R (>= 4.2.0)
Imports: stats, lme4, mgcv, dplyr, ggplot2, rlang, splines
Suggests: lmerTest, knitr, rmarkdown, reformulas, numDeriv, patchwork,
        testthat (>= 3.0.0)
Config/testthat/edition: 3
License: GPL-3
Encoding: UTF-8
Language: en-US
URL: https://github.com/subirhait/MultiSpline
BugReports: https://github.com/subirhait/MultiSpline/issues
NeedsCompilation: no
Packaged: 2026-10-11 09:19:16 UTC; root
Author: Subir Hait [aut, cre] (<https://orcid.org/0009-0004-9871-9677>)
Maintainer: Subir Hait <haitsubi@msu.edu>
Config/roxygen2/version: 8.0.0
Config/pak/sysreqs: cmake make
Repository: https://subirhait.r-universe.dev
Date/Publication: 2026-10-11 03:01:36 UTC
RemoteUrl: https://github.com/subirhait/multispline
RemoteRef: HEAD
RemoteSha: 2037ddd90d8270cbc4998f3fcaf2a5e027350585