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Predicting Party SizesThe Logic of Simple Electoral Systems$
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Rein Taagepera

Print publication date: 2007

Print ISBN-13: 9780199287741

Published to Oxford Scholarship Online: September 2007

DOI: 10.1093/acprof:oso/9780199287741.001.0001

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Deviation from Proportional Representation and Proportionality Profiles

Deviation from Proportional Representation and Proportionality Profiles

Chapter:
(p.65) 5 Deviation from Proportional Representation and Proportionality Profiles
Source:
Predicting Party Sizes
Author(s):

Rein Taagepera (Contributor Webpage)

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199287741.003.0005

Excessive deviation from proportional representation may hurt the democratic legitimacy of the regime. The simplest way to measure the deviation from PR is to add all the differences between seat and vote shares of each party, then divide by two. Proportionality profiles are a way to show which parties are advantaged and which are disadvantaged. Volatility of votes from one election to the next can be measured the same way as the deviation from PR.

Keywords:   deviation from PR, democratic legitimacy, volatility of votes

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