Improved Differentially Private Algorithms for Rank Aggregation
November 14, 2025 Β· Declared Dead Β· π arXiv.org
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Authors
Quentin Hillebrand, Pasin Manurangsi, Vorapong Suppakitpaisarn, Phanu Vajanopath
arXiv ID
2511.11319
Category
cs.DS: Data Structures & Algorithms
Cross-listed
cs.CR
Citations
0
Venue
arXiv.org
Last Checked
4 months ago
Abstract
Rank aggregation is a task of combining the rankings of items from multiple users into a single ranking that best represents the users' rankings. Alabi et al. (AAAI'22) presents differentially-private (DP) polynomial-time approximation schemes (PTASes) and $5$-approximation algorithms with certain additive errors for the Kemeny rank aggregation problem in both central and local models. In this paper, we present improved DP PTASes with smaller additive error in the central model. Furthermore, we are first to study the footrule rank aggregation problem under DP. We give a near-optimal algorithm for this problem; as a corollary, this leads to 2-approximation algorithms with the same additive error as the $5$-approximation algorithms of Alabi et al. for the Kemeny rank aggregation problem in both central and local models.
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