neff {polrep} | R Documentation |
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.
neff(x)
x |
Population vector |
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.
Effective number of parties
Didier Ruedin
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.