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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 - 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," 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://shs.hal.science/halshs-00565315
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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.

    More about this item

    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;
    All these keywords.

    JEL classification:

    • C65 - Mathematical and Quantitative Methods - - Mathematical Methods; Programming Models; Mathematical and Simulation Modeling - - - Miscellaneous Mathematical Tools
    • D71 - Microeconomics - - Analysis of Collective Decision-Making - - - Social Choice; Clubs; Committees; Associations
    • D72 - Microeconomics - - Analysis of Collective Decision-Making - - - Political Processes: Rent-seeking, Lobbying, Elections, Legislatures, and Voting Behavior

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