 | Historically, the theoretical social choice literature on voting procedures in economics and political science routinely highlights worst case scenarios, emphasizing the inexistence of a universally ‘best’ voting method. Indeed, the Impossibility Theorem of Nobel Laureate Kenneth Arrow proved that no voting method can ever satisfy all of his requirements simultaneously. |
New research published in Psychological Science, a journal of the Association for Psychological Science, tested whether methods of voting, including instant runoff, achieved more similar results than previously thought.
Michel Regenwetter, a professor of psychology and political science at the University of Illinois, along with his colleagues analyzed four presidential elections of the American Psychological Association (APA) using state-of-the art decision modeling and statistical methods. APA elections are particularly useful for such analyses because, in contrast to a common two-person runoff election, the APA ballots provide individual voter preference rankings and the APA elections involve multiple candidates (five).
Using these data, the researchers compared instant runoff voting to three other classic methods: Condorcet, in which all candidates are placed head to head against each rival, the winner being the one who wins the most contests; The Borda count in which points are given to each candidate based on ranking by the voter; and the more familiar Plurality system, in which each voter gives one vote to one single candidate.
Although past research has routinely depicted these procedures as irreconcilable, Regenwetter and his colleagues found strong support for consensus among these procedures in these elections. Their findings contrast two centuries of pessimistic thought experiments and computer simulations and demonstrate the need for more systematic empirical research on voting than exists to date. ###
Story Contact: Jesse Erwin jerwin@psychologicalscience.org 202-783-2077 Association for Psychological Science
Image Summary and Licensing: Description A voting machine designed by Alfred J. Gillespie and marketed by the Standard Voting Machine Company of Rochester, New York from the late 1890s.
Source From the National Museum of American History of the Smithsonian Institution in the Vote: The Machinery of Democracy exhibit. Date creation date unknown. Author National Museum of American History. Permission Work of the United States Government
This Image is in the public domain in the United States because it is a work of the United States Federal Government under the terms of 17 U.S.C. § 105
Technorati tags: voting methods and Association for Psychological Science or University of Illinois and presidential elections or voting machine and Plurality system and or Scientists Discover New Way to Study Nanostructures and "I want you" Uncle Sam and Presidential Podcast 08/04/07
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