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On removing Condorcet effects from pairwise election tallies

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  • Abhijit Chandra
  • Sunanda Roy

Abstract

Condorcet profiles are responsible for a number of well known preference aggregation paradoxes. It is reasonable to claim that these profiles represent complete ties between the candidates and should therefore be excluded to determine election outcomes. Established profile decomposition techniques are of limited usefulness in extracting and removing Condorcet effects, because of the computational complexity involved, even if complete knowledge of voters’ rankings of all candidates are available. The paper discusses an easily implementable method of removing or reducing Condorcet effects from pairwise scores. Pairwise scores (and not complete knowledge of voters’ rankings) are often the only available data based on which an election winner has to be determined. Copyright Springer-Verlag 2013

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  • Abhijit Chandra & Sunanda Roy, 2013. "On removing Condorcet effects from pairwise election tallies," Social Choice and Welfare, Springer;The Society for Social Choice and Welfare, vol. 40(4), pages 1143-1158, April.
    • Handle: RePEc:spr:sochwe:v:40:y:2013:i:4:p:1143-1158
    DOI: 10.1007/s00355-012-0665-3
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    References listed on IDEAS

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    1. Saari,Donald G., 2001. "Decisions and Elections," Cambridge Books, Cambridge University Press, number 9780521808163, November.
    2. Saari, Donald G., 1999. "Explaining All Three-Alternative Voting Outcomes," Journal of Economic Theory, Elsevier, vol. 87(2), pages 313-355, August.
    3. Chandra, Abhijit & Roy, Sunanda, 2010. "On Removing the Condorcet Influence from Pairwise Elections Data," Staff General Research Papers Archive 32008, Iowa State University, Department of Economics.
    4. Saari,Donald G., 2001. "Decisions and Elections," Cambridge Books, Cambridge University Press, number 9780521004046, November.
    5. Balinski, Michel & Jennings, Andrew & Laraki, Rida, 2009. "Monotonic incompatibility between electing and ranking," Economics Letters, Elsevier, vol. 105(2), pages 145-147, November.
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