lh {politicsR}

Loosemore–Hanby Index

Description

'lh()' calculates the electoral disproportionality between votes and seats as proposed by Loosemore and Hanby (1971).

Usage

lh(x, y)

Arguments

x

(numeric). Numeric vector with the vote share of parties

y

(numeric). Numeric vector with the seat share of parties

Value

If the input is a proportion the result is between 0 and 1. But if the input is a percentage it is between 0 and 100. In both cases the higher the value, the more disproportional the electoral system is.

References

Loosemore, J., & Hanby, V. (1971). The Theoretical Limits of Maximum Distortion: Some Analytic Expressions for Electoral Systems. British Journal of Political Science, 1(4), 467-477. doi:10.1017/S000712340000925X

Examples

votes <- c(0.2, 0.2, 0.6)
seats <- c(0.18, 0.17, 0.65)
lh(votes, seats)