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The Interpretation of the Laakso-Taagepera Effective Number of Parties

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Abstract

In this paper, we present a general statistical framework within which we can draw a new interpretation of the Laakso-Taagepera effective number of parties fragmentation index. With the particular method of sampling with probability proportional to the party sizes, we show that the Laakso-Taagepera effective number of parties is the inverse of the size biased version of the traditional expected party size in shares. Further, we provide an axiomatic definition of the Laakso-Taagepera effective number of parties.

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File URL: ftp://mse.univ-paris1.fr/pub/mse/CES2011/11006.pdf
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Bibliographic Info

Paper provided by Université Panthéon-Sorbonne (Paris 1), Centre d'Economie de la Sorbonne in its series Documents de travail du Centre d'Economie de la Sorbonne with number 11006.

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Length: 21 pages
Date of creation: Feb 2011
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Handle: RePEc:mse:cesdoc:11006

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Keywords: Fragmentation; effective number of parties; concentration index; size biased sampling; length biased sampling.;

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