選挙制度の非比例性に対する機械的効果 The Mechanical Effect of Electoral Systems on Disproportionality

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  This article defines the mechanical effect of electoral systems according to the literature on causal inference. An electoral system is decomposed into six parts: assembly size, district magnitude, malapportionment, geographical vote distribution, interaction between these, and electoral formula. The article proposes a new index of disproportionality, which is derived from the log likelihood ratio of the multinomial distribution. The mechanical effect of electoral systems on disproportionality is illustrated using simulation as well as election data from both Houses of Japanese Diet from 1890 to 2007.

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  • 日本政治學會年報政治學

    日本政治學會年報政治學 60(1), 1_110-1_139, 2009

    日本政治学会

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