`enp()` calculates the number of Effective Political Parties according to the formula proposed by Laakso and Taagepera (1979).

A toolbox to facilitate the calculation of political system indicators for researchers.
This package offers a variety of basic indicators related to electoral systems, party systems, elections,
and parliamentary studies, as well as others. Main references are:
Loosemore and Hanby (1971) <doi:10.1017/S000712340000925X>;
Gallagher (1991) <doi:10.1016/0261-3794(91)90004-C>;
Laakso and Taagepera (1979) <doi:10.1177/001041407901200101>;
Rae (1968) <doi:10.1177/001041406800100305>;
Hirschmaņ (1945) <ISBN:0-520-04082-1>;
Kesselman (1966) <doi:10.2307/1953769>;
Jones and Mainwaring (2003) <doi:10.1177/13540688030092002>;
Rice (1925) <doi:10.2307/2142407>;
Pedersen (1979) <doi:10.1111/j.1475-6765.1979.tb01267.x>;
SANTOS (2002) <ISBN:85-225-0395-8>.

Denisson Silva

politicsR

Calculating Political System Metrics

Willber Nascimento

Fernando Meireles

Jose Alexandre

enp function

<dl><dt>x</dt>
<dd>(<code>numeric</code>). A numeric vector in the form of a proportion of votes or seats. The vector should between from 0 to 1.</dd></dl>

Arguments

The Effective Number of Parties Index — enp

<dl>

<dt>x</dt>
<dd>(<code>numeric</code>). A numeric vector in the form of a proportion of votes or seats. The vector should between from 0 to 1.</dd>

</dl>

enp: The Effective Number of Parties Index

Description

Usage

Value

Arguments

References

Examples