ML Anthology

On Coalitional Manipulation for Multiwinner Elections: Shortlisting

Robert Bredereck, Andrzej Kaczmarczyk, Rolf Niedermeier
IJCAI 2017 pp. 887-893
doi:10.24963/IJCAI.2017/123 /ijcai/2017/bredereck2017ijcai-coalitional/

Abstract

Shortlisting of candidates—selecting a group of “best” candidates—is a special case of multiwinner elections. We provide the first in-depth study of the computational complexity of strategic voting for shortlisting based on the most natural and simple voting rule in this scenario, l-Bloc (every voter approves l candidates). In particular, we investigate the influence of several tie-breaking mechanisms (e.g. pessimistic versus optimistic) and group evaluation functions (e.g. egalitarian versus utilitarian) and conclude that in an egalitarian setting strategic voting may indeed be computationally intractable regardless of the tie-breaking rule. We provide a fairly comprehensive picture of the computational complexity landscape of this neglected scenario.

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Cite

Text

Bredereck et al. "On Coalitional Manipulation for Multiwinner Elections: Shortlisting." International Joint Conference on Artificial Intelligence, 2017. doi:10.24963/IJCAI.2017/123

Markdown

[Bredereck et al. "On Coalitional Manipulation for Multiwinner Elections: Shortlisting." International Joint Conference on Artificial Intelligence, 2017.](https://mlanthology.org/ijcai/2017/bredereck2017ijcai-coalitional/) doi:10.24963/IJCAI.2017/123

BibTeX

@inproceedings{bredereck2017ijcai-coalitional,
  title     = {{On Coalitional Manipulation for Multiwinner Elections: Shortlisting}},
  author    = {Bredereck, Robert and Kaczmarczyk, Andrzej and Niedermeier, Rolf},
  booktitle = {International Joint Conference on Artificial Intelligence},
  year      = {2017},
  pages     = {887-893},
  doi       = {10.24963/IJCAI.2017/123},
  url       = {https://mlanthology.org/ijcai/2017/bredereck2017ijcai-coalitional/}
}