Bayesian Uncertainty Quantification for Ranked Choice Voting Polls

Ranked choice voting (RCV) is a popular alternative voting method in which voters are asked to list their favored candidates in preference order, rather than vote for a single candidate.

When these ballots are tabulated, candidates are successively eliminated, and their votes are reallocated to each voter's next-preferred choice.

The process continues until a candidate commands a majority of the active ballots and is declared the winner.

As RCV gains wider adoption, the method poses novel challenges for pollsters.

Unlike plurality elections, the event that a candidate wins cannot be expressed in terms of a single population parameter.

Hence, the basic concept of a margin-of-error is not straightforward to define.

Moreover, a candidate's ability to win may depend on both their support across the ballot and the order in which other candidates are eliminated.

Existing measures of sampling uncertainty for polls of RCV elections do not clearly quantify these path-dependent outcomes.

Here, we propose a simple, Bayesian framework to quantify uncertainty in polls of RCV elections.

We cast the problem as one of estimating win probabilities for each leading candidate, and leverage a simple conjugacy relationship to estimate these probabilities conditional on the poll results.

We include applied analyses involving two prominent ranked choice voting elections: the 2021 New York City Democratic mayoral primary, in which Eric Adams narrowly defeated Kathryn Garcia in the final round; and the 2022 special election to Alaska's U.S.

House seat, in which Mary Peltola was elected despite not being a Condorcet winner.

Using the cast vote records from both elections, we demonstrate some challenges of traditional frequentist uncertainty quantification in RCV polls.

We also demonstrate the utility of our approach using a poll of the NYC primary obtained from the polling firm Data for Progress.