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Electoral\r institutions are important, but only because they determine the extent to which\r social forces are translated into political parties. Although the literature has\r finally come to realize that social and institutional forces interact to shape\r party systems, scholars still do not seem to fully understand the implications of\r Duverger’s theory.\nThis article shows that existing research employs flawed\r statistical specifications, makes inferential errors, and does not calculate desired\r quantities of interest. Using a new data set that includes elections since\r 1946, the authors reexamine Duverger’s theory and find that modern tests\r largely bear out his expectations when properly specified and interpreted. This\r analysis also extends current research by specifically estimating the mechanical\r and strategic modifying effects of electora\nl institution."}}]},{"typeName":"keyword","multiple":true,"typeClass":"compound","value":[{"keywordValue":{"typeName":"keywordValue","multiple":false,"typeClass":"primitive","value":"Duverger"}},{"keywordValue":{"typeName":"keywordValue","multiple":false,"typeClass":"primitive","value":"social heterogeneity"}},{"keywordValue":{"typeName":"keywordValue","multiple":false,"typeClass":"primitive","value":"party systems"}},{"keywordValue":{"typeName":"keywordValue","multiple":false,"typeClass":"primitive","value":"electoral institutions"}}]},{"typeName":"publication","multiple":true,"typeClass":"compound","value":[{"publicationCitation":{"typeName":"publicationCitation","multiple":false,"typeClass":"primitive","value":"William Clark, Matt Golder. 2006. \"Rehabilitating Duverger's Theory: Testing the Mechanical and Strategic Modifying Effects of Electoral Laws.\" Comparative Political Studies 39 (6) : 679-708. <a href=\"http://homepages.nyu.edu/%7Emrg217/cps_duverger.pdf\" target= \"_new\">article available here</a>"}}]},{"typeName":"productionDate","multiple":false,"typeClass":"primitive","value":"2006"},{"typeName":"distributor","multiple":true,"typeClass":"compound","value":[{"distributorName":{"typeName":"distributorName","multiple":false,"typeClass":"primitive","value":"Matt Golder"},"distributorURL":{"typeName":"distributorURL","multiple":false,"typeClass":"primitive","value":"http://homepages.nyu.edu/~mrg217/"},"distributorLogoURL":{"typeName":"distributorLogoURL","multiple":false,"typeClass":"primitive","value":"http://www.fsu.edu/.element/img/2.1/headerFSUSeal.gif"}}]},{"typeName":"distributionDate","multiple":false,"typeClass":"primitive","value":"2007"},{"typeName":"dateOfDeposit","multiple":false,"typeClass":"primitive","value":"2007-07"},{"typeName":"timePeriodCovered","multiple":true,"typeClass":"compound","value":[{"timePeriodCoveredStart":{"typeName":"timePeriodCoveredStart","multiple":false,"typeClass":"primitive","value":"1946"},"timePeriodCoveredEnd":{"typeName":"timePeriodCoveredEnd","multiple":false,"typeClass":"primitive","value":"2006"}}]}]}},"files":[{"description":"Data from Amorim Neto & Cox (1997)","label":"Coxappend.tab","restricted":false,"version":1,"datasetVersionId":59509,"categories":["2. 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