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 ≥ β √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 β is a constant determined a priori as a function of the number n of ballots cast and the risk-limit α. 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.