Auditing a collection of races simultaneously

Details Auditing a collection of races simultaneously Auditing a collection of races simultaneously

2009-05-09

arxiv.org/abs/0905.1422v1

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9pp

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A collection of races in a single election can be audited as a group by auditing a random sample of batches of ballots and combining observed discrepancies in the races represented in those batches in a particular way: the maximum across-race relative overstatement of pairwise margins (MARROP). A risk-limiting audit for the entire collection of races can be built on this ballot-based auditing using a variety of probability sampling schemes. The audit controls the familywise error rate (the chance that one or more incorrect outcomes fails to be corrected by a full hand count) at a cost that can be lower than that of controlling the per-comparison error rate with independent audits. The approach is particularly efficient if batches are drawn with probability proportional to a bound on the MARROP (PPEB sampling).

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