The Interpretation of the Laakso-Taagepera Effective Number of Parties

Jean-François Caulier ()

Université Paris1 Panthéon-Sorbonne (Post-Print and Working Papers) from HAL

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.

Keywords: Fragmentation; effective number of parties; concentration index; size biased sampling; length biased sampling; nombre effectif de partis; indice de concentration; échantillonnage biaisée par la taille (search for similar items in EconPapers)
Date: 2011-02
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Published in 2011

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Working Paper: The Interpretation of the Laakso-Taagepera Effective Number of Parties (2011)
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Persistent link: https://EconPapers.repec.org/RePEc:hal:cesptp:halshs-00565315

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