The Interpretation of the Laakso-Taagepera Effective Number of Parties

Jean-François Caulier ()
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Jean-François Caulier: CES - Centre d'économie de la Sorbonne - UP1 - Université Paris 1 Panthéon-Sorbonne - CNRS - Centre National de la Recherche Scientifique

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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.

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
Note: View the original document on HAL open archive server: https://shs.hal.science/halshs-00565315
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Citations: View citations in EconPapers (1)

Published in 2011

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