mlmoderator: Probing, Plotting, and Interpreting Multilevel Interaction Effects
Provides a unified workflow for probing, plotting, and assessing the robustness of cross-level interaction effects in two-level mixed-effects models fitted with 'lme4' (Bates et al., 2015) <doi:10.18637/jss.v067.i01>. Implements simple slopes analysis following Aiken and West (1991, ISBN:9780761907121), Johnson-Neyman intervals following Johnson and Fay (1950) <doi:10.1007/BF02288864> and Bauer and Curran (2005) <doi:10.1207/s15327906mbr4003_5>, and grand- or group-mean centering as described in Enders and Tofighi (2007) <doi:10.1037/1082-989X.12.2.121>. Includes a slope variance decomposition that separates fixed-effect uncertainty from random-slope variance (tau11), a contour surface plot of predicted outcomes over the full predictor-by-moderator space, and robustness diagnostics comprising intraclass correlation coefficient shift analysis and leave-one-cluster-out (LOCO) stability checks. Designed for researchers in education, psychology, biostatistics, epidemiology, organizational science, and other fields where outcomes are clustered within higher-level units.
| Version: | 0.2.1 |
| Depends: | R (≥ 4.1.0) |
| Imports: | lme4, ggplot2, stats, utils, grDevices, rlang |
| Suggests: | testthat (≥ 3.0.0), dplyr, tibble, knitr, rmarkdown, patchwork |
| Published: | 2026-04-03 |
| DOI: | 10.32614/CRAN.package.mlmoderator |
| Author: | Subir Hait  [aut,
cre] |
| Maintainer: | Subir Hait <haitsubi at msu.edu> |
| BugReports: | https://github.com/causalfragility-lab/mlmoderator/issues |
| License: | MIT + file LICENSE |
| URL: | https://github.com/causalfragility-lab/mlmoderator |
| NeedsCompilation: | no |
| Language: | en-US |
| Materials: | README |
| CRAN checks: | mlmoderator results |
Documentation:
| Reference manual: | mlmoderator.html , mlmoderator.pdf |
| Vignettes: |
Cross-Level Interaction Workflow (source, R code) Getting Started with mlmoderator (source, R code) |
Downloads:
| Package source: | mlmoderator_0.2.1.tar.gz |
| Windows binaries: | r-devel: mlmoderator_0.2.1.zip, r-release: mlmoderator_0.2.0.zip, r-oldrel: mlmoderator_0.2.0.zip |
| macOS binaries: | r-release (arm64): mlmoderator_0.2.1.tgz, r-oldrel (arm64): not available, r-release (x86_64): mlmoderator_0.2.0.tgz, r-oldrel (x86_64): mlmoderator_0.2.0.tgz |
| Old sources: | mlmoderator archive |
Linking:
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