Indicators of Electoral Systems and Party Systems R package esaps version 0.2.2 It allows structuring electoral data of different size and structure to calculate various indicators frequently used in the studies of electoral systems and party systems. Indicators of electoral volatility, electoral disproportionality, party nationalization and the effective number of parties are included. Software Imports: dplyr, tidyr, plyr (>= 1.8.4), readODS (>= 1.6.4), readxl (>= 1.0.0) Nicolas Schmidt <nschmidt@cienciassociales.edu.uy> Comprehensive R Archive Network (CRAN) Nicolas Schmidt [aut, cre] (ORCID: <https://orcid.org/0000-0001-5083-5792>) GPL-2 2021-09-13 application/tgz https://CRAN.R-project.org/package=esaps doi:10.32614/CRAN.package.esaps