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:
Electoral Volatility:
Pedersen (1979) <doi:10.1111/j.1475-6765.1979.tb01267.x>
Powell and Tucker (2014) <doi:10.1017/S0007123412000531>
Lago and Torcal (2019) <doi:10.1177/1354068818795191>
Effective Number of Parties:
Laakso and Taagepera (1979) <doi:10.1177/001041407901200101>
Electoral disproportionality:
Rae (1971, ISBN:9780300015171)
Loosemore and Hanby (1971) <doi:10.1017/S000712340000925X>
Lijphart (1986, ISBN:0875860648, 0875860745)
Lijphart (1994) <doi:10.1093/acprof:oso/9780198273479.001.0001>
Cox and Shugart (1991) <doi:10.1016/0261-3794(91)90025-N>
Gallagher (1991) <doi:10.1016/0261-3794(91)90004-C>
Party System Nationalization:
Mainwaring and Jones (2003) <doi:10.1177/13540688030092002>
Chhibber and Kollman (2004, ISBN:9781400826377)
Useful link: https://nicolas-schmidt.github.io/esaps/index.html
Nicolas Schmidt nschmidt@cienciassociales.edu.uy