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The Interpretation of the Laakso-Taagepera Effective Number of Parties

Author

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  • Jean-François Caulier

    () (CES - Centre d'économie de la Sorbonne - CNRS - Centre National de la Recherche Scientifique - UP1 - Université Panthéon-Sorbonne)

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.

Suggested Citation

  • Jean-François Caulier, 2011. "The Interpretation of the Laakso-Taagepera Effective Number of Parties," Université Paris1 Panthéon-Sorbonne (Post-Print and Working Papers) halshs-00565315, HAL.
  • Handle: RePEc:hal:cesptp:halshs-00565315
    Note: View the original document on HAL open archive server: https://halshs.archives-ouvertes.fr/halshs-00565315
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