A First Approach to Risk-Limiting Audits for Single Transferable Vote Elections

12/18/2021
by   Michelle Blom, et al.
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Risk-limiting audits (RLAs) are an increasingly important method for checking that the reported outcome of an election is, in fact, correct. Indeed, their use is increasingly being legislated. While effective methods for RLAs have been developed for many forms of election – for example: first-past-the-post, instant-runoff voting, and D'Hondt elections – auditing methods for single transferable vote (STV) elections have yet to be developed. STV elections are notoriously hard to reason about since there is a complex interaction of votes that change their value throughout the process. In this paper we present the first approach to risk-limiting audits for STV elections, restricted to the case of 2-seat STV elections.

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