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Optimal Manipulation of Voting Rules

机译:投票规则的最佳操纵

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摘要

Complexity of voting manipulation is a prominent research topic in computational social choice. The voting manipulation literature usually assumes that the manipulator is only concerned with improving the outcome of the election from her perspective. However, in practice, the manipulator may also be reluctant to lie, i.e., she may have a preference for submitting a vote that does not deviate too much from her true ranking of the candidates. In this paper, we study the complexity of finding a manipulative vote that achieves the manipulator's goal yet is as close as possible to her true preference order. We analyze this problem for three natural notions of closeness, namely, swap distance, footrule distance, and maximum displacement distance, and a variety of voting rules, such as scoring rules, Bucklin, Copeland, and Max-imin. For all three distances, we obtain polynomial-time algorithms for all scoring rules and Bucklin and hardness results for Copeland and Maximin.
机译:投票操纵的复杂性是计算社会选择中一个突出的研究主题。投票操纵文献通常假设操纵者从她的角度仅关注改善选举结果。然而,在实践中,操纵者也可能不愿说谎,即,她可能偏向于提交不会偏离她的真实候选人排名过多的投票。在本文中,我们研究了找到能够实现操纵者目标但仍尽可能接近其真实偏好顺序的操纵投票的复杂性。我们用三个自然的紧密度概念来分析该问题,即交换距离,规则距离和最大位移距离,以及各种投票规则,例如计分规则,Bucklin,Copeland和Max-imin。对于所有三个距离,我们获得了所有计分规则的多项式时间算法,以及谷轮和马克西姆的巴克林和硬度结果。

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