The Seat Product Model of the effective number of parties: A case for applied political science |
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| Affiliation: | 1. Member of the Parliament of Malaysia, Malaysia;2. Keio University, Japan;3. IPG Mediabrands, Japan;1. University of Maryland, United States;2. Universidade de Estado de Rio de Janeiro, Brazil;3. Universidade de Sao paulo, Brazil;1. Department of Political Science, Stanford University, 100 Encina Hall West, 616 Serra St., Stanford, CA 94305, United States;2. Department of Economics, BI Norwegian Business School, 0442 Oslo, Norway;3. Department of Political Science and School of International and Public Affairs, Columbia University, 420 W. 118th Street, New York, NY, 10027, United States;4. Department of Economics, BI Norwegian Business School, 0442 Oslo, Norway;1. Dept. of Political Science, Université Libre de Bruxelles, Brussels, Belgium;2. Dept. of Political Science, Vrije Universiteit Brussel, Brussels, Belgium;3. Dept. of Politics and International Relations, University of Leicester, Leicester, United Kingdom |
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| Abstract: | This paper extends Taagepera's (2007) Seat Product Model and shows that the effective number of seat-wining parties and vote winning parties can both be predicted with institutional variables alone, namely district magnitude, assembly size, and upper-tier seat share. The expected coefficients are remarkably stable across different samples. Including the further information of ethnic diversity in the models hardly improves the estimate of the effective number of parties, and thus the institutions-only models are preferable on the grounds of parsimony and the applicability to electoral-system design or “engineering”. |
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| Keywords: | Electoral system Party system Effective number of parties Seat product |
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