neff: Calculates effective number of parties

Description Usage Arguments Details Value Author(s) References See Also

View source: R/neff.R

Description

This function calculates one version of the effective number of parties introduced by Laakso and Taagepera (1979). It can be used to estimate the effective number of groups in a population.

Usage

1
neff(x)

Arguments

x

Population vector

Details

This is one of two functions to calculate the number of effective parties. It gives 1 divided by the sum of Z squared. This function can be used to enumerate the effective number of parties, but also the effective number of groups in a population or representative body.

Value

Effective number of parties

Author(s)

Didier Ruedin

References

Laakso, M., and R. Taagepera (1979) The Effective Number of Parties: A Measure with Application to West Europe. Comparative Political Studies 12(1): 3-27.

See Also

neffProd, GTT, GTD2


polrep documentation built on Oct. 9, 2017, 3:01 p.m.