On the hardness of maximum rank aggregation problems
On the hardness of maximum rank aggregation problems
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关于最大秩聚合问题的难度
DOI:
10.1016/j.jda.2014.10.002
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发表时间:
2014
期刊:
影响因子:
--
通讯作者:
A. Hofmeier
中科院分区:
文献类型:
--
作者:
C. Bachmaier;F.J. Brandenburg;A. Gleißner;A. Hofmeier
The rank aggregation problem consists in finding a consensus ranking on a set of alternatives, based on the preferences of individual voters. The alternatives are expressed by permutations, whose pairwise distance can be measured in many ways.In this work we study a collection of distances, including the Kendall tau, Spearman footrule, Minkowski, Cayley, Hamming, Ulam, and related edit distances. Unlike the common median by summation, we compute the consensus against the maximum. The maximum consensus attempts to minimize the discrimination against any voter and is a smallest enclosing ball or center problem.We provide a general schema via local permutations for theNP-hardness of the maximum rank aggregation problems under all distances which satisfy some general requirements. This unifies formerNP-hardness results for some distances and lays the ground for further ones. In particular, we establish a dichotomy for rank aggregation problems under the Spearman footrule and Minkowski distances: The median version is solvable in polynomial time whereas the maximum version isNP-hard. Moreover, we show that the maximum rank aggregation problem is 2-approximable under any pseudometric and fixed-parameter tractable under the Kendall tau, Hamming, and Minkowski distances, where again a general schema via modification sets applies.
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DOI:
--
发表时间:
2013
期刊:
International Workshop on Combinatorial Algorithms
影响因子:
--
作者:
C. Bachmaier;F. Brandenburg;Andreas Gleißner;A. Hofmeier
通讯作者:
A. Hofmeier
影响因子:
0.8
作者:
T. Biedl;F. Brandenburg;Xiaotie Deng
通讯作者:
Xiaotie Deng
影响因子:
1.1
作者:
A. Amir;E. Eisenberg;E. Porat
通讯作者:
E. Porat
影响因子:
1.1
作者:
V. Popov
通讯作者:
V. Popov
影响因子:
8
作者:
B. Oommen;R. Loke
通讯作者:
R. Loke