`hiperfrac` calculates the hyperfractionalization index proposed by Kesselman (1966) and Wildgen (1971), which is useful for party system with many small parties.
Usage
hiperfrac(x)
Value
A continued value, the larger the higher the fragmentation of the system
Arguments
x
(numeric). A number vector in the form of a proportion of votes or seats. The vector should range from 0 to 1.
Details
This index places more weights to small parties compared to the Effective Number of Political Parties Index (`enp`)
References
Kesselman, M. (1966). French Local Politics: A Statistical Examination of Grass Roots Consensus. American Political Science Review, 60(4), 963-973. doi:10.2307/1953769
Wildgen, J. K. (1971). The Measurement of Hyperfractionalization. Comparative Political Studies, 4(2), 233–243. https://doi.org/10.1177/001041407100400205