Linear Mixed-Effects Models using 'Eigen' and S4 R package lme4 version 2.0-6 CRAN Task View: ClinicalTrials (https://CRAN.R-project.org/view=ClinicalTrials) CRAN Task View: Econometrics (https://CRAN.R-project.org/view=Econometrics) CRAN Task View: Environmetrics (https://CRAN.R-project.org/view=Environmetrics) CRAN Task View: MixedModels (https://CRAN.R-project.org/view=MixedModels) CRAN Task View: Psychometrics (https://CRAN.R-project.org/view=Psychometrics) CRAN Task View: SpatioTemporal (https://CRAN.R-project.org/view=SpatioTemporal) Fit linear and generalized linear mixed-effects models. The models and their components are represented using S4 classes and methods. The core computational algorithms are implemented using the 'Eigen' C++ library for numerical linear algebra and 'RcppEigen' "glue". Software Depends: R (>= 3.6), Matrix, methods, stats Imports: MASS, Rdpack, boot, graphics, grid, lattice, minqa (>= 1.1.15), nlme (>= 3.1-123), nloptr (>= 1.0.4), parallel, reformulas (>= 0.4.3.1), splines, utils LinkingTo: Matrix (>= 1.5-0), Rcpp (>= 1.1.1-1.1), RcppEigen (>= 0.3.3.9.4) Suggests: DHARMa, HSAUR3, MEMSS, car, dfoptim, future.apply, gamm4, ggplot2, glmmTMB, gridExtra, knitr, merDeriv, mgcv, mlmRev, numDeriv, optimx (>= 2013.8.6), pbkrtest, performance, rmarkdown, rr2, see, semEff, statmod, testthat (>= 0.8.1), tibble Ben Bolker <bbolker+lme4@gmail.com> Comprehensive R Archive Network (CRAN) Douglas Bates [aut] (ORCID: <https://orcid.org/0000-0001-8316-9503>), Martin Maechler [aut] (ORCID: <https://orcid.org/0000-0002-8685-9910>), Ben Bolker [cre, aut] (ORCID: <https://orcid.org/0000-0002-2127-0443>), Steven Walker [aut] (ORCID: <https://orcid.org/0000-0002-4394-9078>), Anna Ly [aut] (ORCID: <https://orcid.org/0000-0002-0210-0342>), Mikael Jagan [aut] (ORCID: <https://orcid.org/0000-0002-3542-2938>), Rune Haubo Bojesen Christensen [ctb] (ORCID: <https://orcid.org/0000-0002-4494-3399>), Henrik Singmann [ctb] (ORCID: <https://orcid.org/0000-0002-4842-3657>), Bin Dai [ctb], Fabian Scheipl [ctb] (ORCID: <https://orcid.org/0000-0001-8172-3603>), Gabor Grothendieck [ctb], Peter Green [ctb] (ORCID: <https://orcid.org/0000-0002-0238-9852>), John Fox [ctb], Alexander Bauer [ctb], Pavel N. Krivitsky [ctb, cph] (ORCID: <https://orcid.org/0000-0002-9101-3362>, shared copyright on simulate.formula), Emi Tanaka [ctb] (ORCID: <https://orcid.org/0000-0002-1455-259X>), Ross D. Boylan [ctb] (ORCID: <https://orcid.org/0009-0003-4123-8090>), Henrik Bengtsson [ctb] (ORCID: <https://orcid.org/0000-0002-9280-4430>) GPL (>= 2) 2026-07-16 application/tgz https://CRAN.R-project.org/package=lme4 doi:10.32614/CRAN.package.lme4