Extensions for Synthetic Controls Analysis R package SCtools version 0.3.3.1 Extends the functionality of the package 'Synth' as detailed in Abadie, Diamond, and Hainmueller (2011) <doi:10.18637/jss.v042.i13>. Includes generating and plotting placebos, post/pre-MSPE (Mean Squared Prediction Error) significance tests and plots, and calculating average treatment effects for multiple treated units. Software Depends: R (>= 3.5), future (>= 1.6.2) Imports: ggplot2, Synth, stringr, stats, cvTools, furrr, dplyr, purrr, tidyr, magrittr Suggests: testthat (>= 3.0.0), knitr, rmarkdown Bruno Castanho Silva <b.paula.castanho.e.silva@fu-berlin.de> Comprehensive R Archive Network (CRAN) Bruno Castanho Silva [aut, cre] (ORCID: <https://orcid.org/0000-0001-9363-4704>), Michael DeWitt [aut] (ORCID: <https://orcid.org/0000-0001-8940-1967>) GPL-3 2025-01-27 application/tgz https://CRAN.R-project.org/package=SCtools doi:10.32614/CRAN.package.SCtools