Accuracy of Combined Forecasts for the 2012 Presidential Elections: The Pollyvote
Political Science & Politics, Forthcoming
13 Pages Posted: 8 Apr 2013 Last revised: 15 Jan 2014
Date Written: January 15, 2014
We review the performance of the PollyVote, which combined forecasts from polls, prediction markets, experts’ judgment, political economy models, and index models to predict the two-party popular vote in the 2012 US presidential election. Throughout the election year the PollyVote provided highly accurate forecasts, outperforming each of its component methods, as well as the forecasts from FiveThirtyEight.com. Gains in accuracy were particularly large early in the campaign, when uncertainty about the election outcome is typically high. The results confirm prior research showing that combining is one of the most effective approaches to generating accurate forecasts.
Keywords: combining forecasts, forecast accuracy, Iowa Electronic Markets, FiveThirtyEight, econometric models, election forecasting
JEL Classification: C10, C53
Suggested Citation: Suggested Citation