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

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.

1 | ```
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.

polrep documentation built on Feb. 24, 2018, 3:01 a.m.

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