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The Condorcet Efficiency of the Preference Approval Voting and the Probability of Selecting the Condorcet Loser

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  • Eric Kamwa

    (LC2S - Laboratoire caribéen de sciences sociales - CNRS - Centre National de la Recherche Scientifique - UA - Université des Antilles)

Abstract

Under Approval Voting (AV), each voter just distinguishes the candidates he approves of from those appearing as unacceptable. The Preference Approval Voting (PAV) is a hybrid version of the approval voting first introduced by Brams and Sanver (2009). Under PAV, each voter ranks all the candidates and then indicates the ones he approves. In this paper, we provide analytical representations for the probability that PAV elects the Condorcet winner when she exists in three-candidate elections with large electorates. We also provide analytical representations for the probability that PAV elects the Condorcet loser. We perform our analysis by assuming the assumption of the Extended Impartial Culture. This analysis allows us to measure at which extend, PAV performs better than AV both on the propensity of electing the Condorcet loser and on that of the non-election of the Condorcet loser.

Suggested Citation

  • Eric Kamwa, 2019. "The Condorcet Efficiency of the Preference Approval Voting and the Probability of Selecting the Condorcet Loser," Post-Print hal-01786121, HAL.
    • Handle: RePEc:hal:journl:hal-01786121
    Note: View the original document on HAL open archive server: https://hal.univ-antilles.fr/hal-01786121v2
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    5. Mostapha Diss & Abdelmonaim Tlidi, 2018. "Another perspective on Borda’s paradox," Theory and Decision, Springer, vol. 84(1), pages 99-121, January.
    6. Eric Kamwa, 2019. "On the Likelihood of the Borda Effect: The Overall Probabilities for General Weighted Scoring Rules and Scoring Runoff Rules," Group Decision and Negotiation, Springer, vol. 28(3), pages 519-541, June.
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    Cited by:

    1. Eric Kamwa, 2023. "On Two Voting systems that combine approval and preferences: Fallback Voting and Preference Approval Voting," Working Papers hal-03614585, HAL.
    2. Mostapha Diss & Eric Kamwa & Issofa Moyouwou & Hatem Smaoui, 2021. "Condorcet Efficiency of General Weighted Scoring Rules Under IAC: Indifference and Abstention," Studies in Choice and Welfare, in: Mostapha Diss & Vincent Merlin (ed.), Evaluating Voting Systems with Probability Models, pages 55-73, Springer.
    3. Yucheng Dong & Yao Li & Ying He & Xia Chen, 2021. "Preference–Approval Structures in Group Decision Making: Axiomatic Distance and Aggregation," Decision Analysis, INFORMS, vol. 18(4), pages 273-295, December.
    4. Alessandro Albano & José Luis García-Lapresta & Antonella Plaia & Mariangela Sciandra, 2023. "A family of distances for preference–approvals," Annals of Operations Research, Springer, vol. 323(1), pages 1-29, April.
    5. Eric Kamwa, 2023. "On two voting systems that combine approval and preferences: fallback voting and preference approval voting," Public Choice, Springer, vol. 196(1), pages 169-205, July.

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    Keywords

    Probability; Condorcet; Extended Impartial Culture; Ranking; Approval Voting;
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