Estimating parliamentary composition through electoral polls
AbstractAny electoral system has an electoral formula that converts vote proportions into parliamentary seats. Pre-electoral polls usually focus on estimating vote proportions and then applying the electoral formula to give a forecast of the parliament's composition. We here describe the problems arising from this approach: there is always a bias in the forecast. We study the origin of the bias and some methods to evaluate and to reduce it. We propose some rules to compute the sample size required for a given forecast accuracy. We show by Monte Carlo simulation the performance of the proposed methods using data from Spanish elections in last years. We also propose graphical methods to visualize how electoral formulae and parliamentary forecasts work (or fail).
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Bibliographic InfoPaper provided by Department of Economics and Business, Universitat Pompeu Fabra in its series Economics Working Papers with number 562.
Date of creation: Jul 2001
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Web page: http://www.econ.upf.edu/
d'Hondt rule; electoral formula; forecasting election results; Monte Carlo; sample size; seats apportion;
Other versions of this item:
- Frederic Udina & Pedro Delicado, 2005. "Estimating Parliamentary composition through electoral polls," Journal of the Royal Statistical Society Series A, Royal Statistical Society, vol. 168(2), pages 387-399.
- C13 - Mathematical and Quantitative Methods - - Econometric and Statistical Methods and Methodology: General - - - Estimation: General
- C15 - Mathematical and Quantitative Methods - - Econometric and Statistical Methods and Methodology: General - - - Statistical Simulation Methods: General
- D72 - Microeconomics - - Analysis of Collective Decision-Making - - - Political Processes: Rent-seeking, Lobbying, Elections, Legislatures, and Voting Behavior
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