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The Interpretation of the Laakso-Taagepera Effective Number of Parties

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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)

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," Post-Print halshs-00565315, HAL.
    • Handle: RePEc:hal:journl:halshs-00565315
    Note: View the original document on HAL open archive server: https://shs.hal.science/halshs-00565315
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    References listed on IDEAS

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    1. Molinar, Juan, 1991. "Counting the Number of Parties: An Alternative Index," American Political Science Review, Cambridge University Press, vol. 85(4), pages 1383-1391, December.
    2. Blackorby, Charles & Donaldson, David & Weymark, John A., 1982. "A normative approach to industrial-performance evaluation and concentration indices," European Economic Review, Elsevier, vol. 19(1), pages 89-121.
    3. Elkins, David J., 1974. "The Measurement of Party Competition," American Political Science Review, Cambridge University Press, vol. 68(2), pages 682-700, June.
    4. Roberto Ricciuti, 2004. "Political Fragmentation and Fiscal Outcomes," Public Choice, Springer, vol. 118(3_4), pages 365-388, March.
    5. Leslie Hannah & J. A. Kay, 1977. "The Measurement of Concentration," Palgrave Macmillan Books, in: Concentration in Modern Industry, chapter 4, pages 41-63, Palgrave Macmillan.
    6. Davies, Stephen W, 1979. "Choosing between Concentration Indices: The Iso-Concentration Curve," Economica, London School of Economics and Political Science, vol. 46(181), pages 67-75, February.
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    Cited by:

    1. Paola Azar Dufrechou, 2018. "Electoral politics and the diffusion of primary schooling: evidence from Uruguay, 1914-1954," Working Papers wpdea1801, Department of Applied Economics at Universitat Autonoma of Barcelona.

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