Causal Mediation Analysis in Multisite Trials R package MultisiteMediation version 0.0.4 CRAN Task View: CausalInference (https://CRAN.R-project.org/view=CausalInference) Multisite causal mediation analysis using the methods proposed by Qin and Hong (2017) <doi:10.3102/1076998617694879>, Qin, Hong, Deutsch, and Bein (2019) <doi:10.1111/rssa.12446>, and Qin, Deutsch, and Hong (2021) <doi:10.1002/pam.22268>. It enables causal mediation analysis in multisite trials, in which individuals are assigned to a treatment or a control group at each site. It allows for estimation and hypothesis testing for not only the population average but also the between-site variance of direct and indirect effects transmitted through one single mediator or two concurrent (conditionally independent) mediators. This strategy conveniently relaxes the assumption of no treatment-by-mediator interaction while greatly simplifying the outcome model specification without invoking strong distributional assumptions. This package also provides a function that can further incorporate a sample weight and a nonresponse weight for multisite causal mediation analysis in the presence of complex sample and survey designs and non-random nonresponse, to enhance both the internal validity and external validity. The package also provides a weighting-based balance checking function for assessing the remaining overt bias. Software Depends: lme4, statmod, psych, MASS, ggplot2 Xu Qin <xuqin@pitt.edu> Comprehensive R Archive Network (CRAN) Xu Qin, Guanglei Hong, Jonah Deutsch, and Edward Bein GPL-2 2021-09-05 application/tgz https://CRAN.R-project.org/package=MultisiteMediation doi:10.32614/CRAN.package.MultisiteMediation