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arxiv 2004.00235 v1 pith:OWTE33RN submitted 2020-04-01 cs.CY cs.AI

Michelle Blom , Andrew Conway , Dan King , Laurent Sandrolini , Philip B. Stark , Peter J. Stuckey , Vanessa Teague This is my paper
classification cs.CYcs.AI
keywords franciscopilotriskattorneyauditedauditsballotscity
verification ladder T0 review T1 audit T2 compute T3 formal
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The City and County of San Francisco, CA, has used Instant Runoff Voting (IRV) for some elections since 2004. This report describes the first ever process pilot of Risk Limiting Audits for IRV, for the San Francisco District Attorney's race in November, 2019. We found that the vote-by-mail outcome could be efficiently audited to well under the 0.05 risk limit given a sample of only 200 ballots. All the software we developed for the pilot is open source.

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