Published online by Cambridge University Press: 22 December 2014
Recent scholarship has identified problems in the measurement of partysystem instability. To limit the conflation of different sources ofinstability in party systems (e.g., electoral shifts between stable partiesand instability in parties, such as mergers, splinters or new parties), thisarticle introduces a new indicator of electoral instability in parties,tests its robustness and construct validity and demonstrates its usefulnessempirically. The indicators of party instability and the accompanying dataof 27 European democracies, 1987–2011, will be valuable resources incomparative research on the interplay between elite and mass behavior, partyand electoral systems, and democratic consolidation.
Dani M. Marinova, Post-Doctoral Researcher, Hertie School ofGovernance, Friedrichstraße 180, 10117 Berlin (marinova.da@gmail.com, marinova@hertie-school.org). Thismanuscript was completed while the author was a visiting researcher atthe Democracy, Elections and Citizenship research group at theAutonomous University of Barcelona, Spain. Eva Anduiza, JackBielasiak, Kenneth Janda, Timothy Hellwig, Jordi Muñoz and theanonymous reviewers offered comments on earlier drafts of this paper;Ian Anson and Nicholas D’Amico provided research assistance. Theauthor acknowledges financial support from the National ScienceFoundation (Doctoral Dissertation Improvement Grant in PoliticalScience to Marinova, SES 1065761). To view supplementary material forthis article, please visit http://dx.doi.org/10.1017/psrm.2014.35