Cluster-Robust (Sandwich) Variance Estimators with Small-Sample Corrections R package clubSandwich version 0.7.0 CRAN Task View: Econometrics (https://CRAN.R-project.org/view=Econometrics) CRAN Task View: MetaAnalysis (https://CRAN.R-project.org/view=MetaAnalysis) CRAN Task View: MixedModels (https://CRAN.R-project.org/view=MixedModels) CRAN Task View: Robust (https://CRAN.R-project.org/view=Robust) Provides several cluster-robust variance estimators (i.e., sandwich estimators) for ordinary and weighted least squares linear regression models, including the bias-reduced linearization estimator introduced by Bell and McCaffrey (2002) <https://www150.statcan.gc.ca/n1/pub/12-001-x/2002002/article/9058-eng.pdf> and developed further by Pustejovsky and Tipton (2017) <DOI:10.1080/07350015.2016.1247004>. The package includes functions for estimating the variance- covariance matrix and for testing single- and multiple- contrast hypotheses based on Wald test statistics. Tests of single regression coefficients use Satterthwaite or saddle-point corrections. Tests of multiple- contrast hypotheses use an approximation to Hotelling's T-squared distribution. Methods are provided for a variety of fitted models, including lm() and mlm objects; glm(); geeglm() (from package 'geepack'); lm_robust(), lm_lin(), and iv_robust() (from package 'estimatr'); ivreg() (from package 'AER'); ivreg() (from package 'ivreg' when estimated by ordinary least squares); plm() (from package 'plm'); gls() and lme() (from 'nlme'); lmer() (from `lme4`); robu() (from 'robumeta'); rma.uni() and rma.mv() (from 'metafor'); and mmrm() (from 'mmrm'). Software Depends: R (>= 3.0.0) Imports: stats, sandwich, lifecycle Suggests: Formula, knitr, testthat, rmarkdown, covr, AER, carData, estimatr, fixest, geepack, ivreg, Matrix, lme4, metafor, metadat, mlmRev, mmrm, nlme, plm (>= 1.6-4), robumeta, zoo James E. Pustejovsky <jepusto@gmail.com> Comprehensive R Archive Network (CRAN) James E. Pustejovsky [aut, cre] (ORCID: <https://orcid.org/0000-0003-0591-9465>), Hazim Izani [ctb], Samuel Pekofsky [ctb], Jingru Zhang [ctb] GPL-3 2026-05-04 application/tgz https://CRAN.R-project.org/package=clubSandwich doi:10.32614/CRAN.package.clubSandwich en-US