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Study: small overall RCV error rate but concentrated in certain precincts and demographics
Summary
A LAFCO-briefed study of San Francisco—s 2011 ranked-choice ballots found an overall error rate of about 1.3% with some precincts approaching ~10%; higher error or bullet-voting rates were concentrated in precincts with larger Asian/Pacific Islander, Latino, older and progressive populations, and researchers recommended further targeted research.
Corey Cook, a University of San Francisco professor, briefed the commission on research replicating earlier analyses of ranked-choice ballots and said the 2011 mayoral election produced a modest but concentrated set of ballot errors.
"Overall, I think 1.3% of people in San Francisco made an error that could invalidate their ballot using ranked choice voting," Cook said, and he added that in some precincts the figure was "almost 10." Cook told commissioners precincts…
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