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Dynamic Programming for Computing Power Indices for Weighted Voting Games with Precoalitions

Author

Listed:
  • Jochen Staudacher

    (Fakultät Informatik, Hochschule Kempten, 87435 Kempten, Germany)

  • Felix Wagner

    (Fakultät Informatik, Hochschule Kempten, 87435 Kempten, Germany)

  • Jan Filipp

    (Fakultät Informatik, Hochschule Kempten, 87435 Kempten, Germany)

Abstract

We study the efficient computation of power indices for weighted voting games with precoalitions amongst subsets of players (reflecting, e.g., ideological proximity) using the paradigm of dynamic programming. Starting from the state-of-the-art algorithms for computing the Banzhaf and Shapley–Shubik indices for weighted voting games, we present a framework for fast algorithms for the three most common power indices with precoalitions, i.e., the Owen index, the Banzhaf–Owen index and the symmetric coalitional Banzhaf index, and point out why our new algorithms are applicable for large numbers of players. We discuss implementations of our algorithms for the three power indices with precoalitions in C++ and review computing times, as well as storage requirements.

Suggested Citation

  • Jochen Staudacher & Felix Wagner & Jan Filipp, 2021. "Dynamic Programming for Computing Power Indices for Weighted Voting Games with Precoalitions," Games, MDPI, vol. 13(1), pages 1-17, December.
    • Handle: RePEc:gam:jgames:v:13:y:2021:i:1:p:6-:d:711371
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    References listed on IDEAS

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    2. Kóczy, László Á., 2012. "Beyond Lisbon: Demographic trends and voting power in the European Union Council of Ministers," Mathematical Social Sciences, Elsevier, vol. 63(2), pages 152-158.
    3. László Á. Kóczy, 2021. "Brexit and Power in the Council of the European Union," Games, MDPI, vol. 12(2), pages 1-10, June.
    4. Cesarino Bertini & Josep Freixas & Gianfranco Gambarelli & Izabella Stach, 2013. "Comparing Power Indices," International Game Theory Review (IGTR), World Scientific Publishing Co. Pte. Ltd., vol. 15(02), pages 1-19.
    5. Shapley, L. S. & Shubik, Martin, 1954. "A Method for Evaluating the Distribution of Power in a Committee System," American Political Science Review, Cambridge University Press, vol. 48(3), pages 787-792, September.
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