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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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Thresholds of Representation and the Number of Pertinent Electoral Parties

Thresholds of Representation and the Number of Pertinent Electoral Parties

Chapter:
(p.241) 15 Thresholds of Representation and the Number of Pertinent Electoral Parties
Source:
Predicting Party Sizes
Author(s):

Rein Taagepera (Contributor Webpage)

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199287741.003.0015

The nationwide threshold of minimal representation is the average vote share needed to win one seat in the assembly. It is close to 38% divided by the square root of the seat product (assembly size times district magnitude). If greater inclusion of political minorities is desired, this threshold can be lowered by increasing district magnitude and/or assembly size. The number of serious or pertinent parties might be close to square root plus fourth root of district magnitude, plus one.

Keywords:   seat product, assembly size, district magnitude, inclusion of political minorities, pertinent parties

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