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arXiv · 1701.08312

ClipAudit: A Simple Risk-Limiting Post-Election Audit

Ronald L. Rivest
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Abstract

We propose a simple risk-limiting audit for elections, ClipAudit. To determine whether candidate A (the reported winner) actually beat candidate B in a plurality election, ClipAudit draws ballots at random, without replacement, until either all cast ballots have been drawn, or until \[ a - b \ge \beta \sqrt{a+b} \] where $a$ is the number of ballots in the sample for the reported winner A, and $b$ is the number of ballots in the sample for opponent B, and where $\beta$ is a constant determined a priori as a function of the number $n$ of ballots cast and the risk-limit $\alpha$. ClipAudit doesn't depend on the unofficial margin (as does Bravo). We show how to extend ClipAudit to contests with multiple winners or losers, or to multiple contests.

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Ronald L. Rivest. 2017-01-28. ClipAudit: A Simple Risk-Limiting Post-Election Audit. https://arxiv.org/abs/1701.08312

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