Risk-Limiting Audits for IRV Elections

by   Michelle Blom, et al.
Monash University
The University of Melbourne

Risk-limiting post election audits guarantee a high probability of correcting incorrect election results, independent of why the result was incorrect. Ballot-polling audits select ballots at random and interpret those ballots as evidence for and against the reported result, continuing this process until either they support the recorded result, or they fall back to a full manual recount. For elections with digitised scanning and counting of ballots, a comparison audit compares randomly selected digital ballots with their paper versions. Discrepancies are referred to as errors, and are used to build evidence against or in support of the recorded result. Risk-limiting audits for first-past-the-post elections are well understood, and used in some US elections. We define a number of approaches to ballot-polling and comparison risk-limiting audits for Instant Runoff Voting (IRV) elections. We show that for almost all real elections we found, we can perform a risk-limiting audit by looking at only a small fraction of the total ballots (assuming no errors were made in the tallying and distribution of votes).


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

Risk-limiting audits (RLAs) are an increasingly important method for che...

k-Cut: A Simple Approximately-Uniform Method for Sampling Ballots in Post-Election Audits

We present an approximate sampling framework and discuss how risk-limiti...

Auditing Indian Elections

Indian Electronic Voting Machines (EVMs) will be fitted with printers th...

Non(c)esuch Ballot-Level Risk-Limiting Audits for Precinct-Count Voting Systems

Risk-limiting audits (RLAs) guarantee a high probability of correcting i...

More style, less work: card-style data decrease risk-limiting audit sample sizes

U.S. elections rely heavily on computers such as voter registration data...

Lazy Risk-Limiting Ballot Comparison Audits

Risk-limiting audits or RLAs are rigorous statistical procedures meant t...

New Algorithms and Applications for Risk-Limiting Audits

Risk-limiting audits (RLAs) are a significant tool in increasing confide...

Please sign up or login with your details

Forgot password? Click here to reset