Designing and Analyzing Two-Stage Randomized Experiments R package RCT2 version 0.0.1 Provides various statistical methods for designing and analyzing two-stage randomized controlled trials using the methods developed by Imai, Jiang, and Malani (2021) <doi:10.1080/01621459.2020.1775612> and (2022+) <doi:10.48550/arXiv.2011.07677>. The package enables the estimation of direct and spillover effects, conduct hypotheses tests, and conduct sample size calculation for two-stage randomized controlled trials. Software Depends: R (>= 3.1.0) Imports: sandwich, AER, stats, quadprog Suggests: testthat, knitr, rmarkdown Kosuke Imai <imai@harvard.edu> Comprehensive R Archive Network (CRAN) Karissa Huang [aut], Zhichao Jiang [aut], Kosuke Imai [aut, cre] GPL (>= 2) 2022-10-18 application/tgz https://CRAN.R-project.org/package=RCT2 doi:10.32614/CRAN.package.RCT2