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Party-list proportional representation

From Academic Kids

fr:Scrutin proportionnel plurinominal

Party-list proportional representation systems are a family of voting systems used in multiple-winner elections (e.g. elections to parliament), emphasizing proportional representation. In these systems, parties make lists of candidates to be elected, and seats get allocated to each party in proportion to the number of votes the party receives. Voters may vote directly for the party, like in Israel, or they may vote for candidates and that vote will pool to the party, like in Turkey and Finland. The order in which the party's list candidates get elected may be pre-determined by some method internal to the party (a closed list system) or they may be determined by the voters at large (an open list system).

a poster for the European Parliament election 2004 in Italy, showing party lists
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a poster for the European Parliament election 2004 in Italy, showing party lists

There are many variations on seat allocation within party-list proportional representation. The three most common are:

List PR may also be combined in various hybrids (e.g. using the Additional member system).

The unmodified Sainte-LaguŽ method and the LR-Hare method rank as the most proportional followed by LR-Droop; single transferable vote; modified Sainte-LaguŽ, d'Hondt and largest remainder Imperiali. While the allocation formula is important, equally important is the district magnitude (number of seats in a constituency). The higher the district magnitude, the more proportional an electoral system becomes.

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