St Comp Int Dev https://doi.org/10.1007/s12116-018-9268-z Measuring Polyarchy Across the Globe, 1900–2017 Jan Teorell1 & Michael Coppedge2 & Staffan Lindberg3 & Svend-Erik Skaaning 4 # The Author(s) 2018 Abstract This paper presents a new measure polyarchy for a global sample of 182 countries from 1900 to 2017 based on the Varieties of Democracy (V-Dem) data, deriving from an expert survey of more than 3000 country experts from around the world, with on average 5 experts rating each indicator. By measuring the five compo- nents of Elected Officials, Clean Elections, Associational Autonomy, Inclusive Citi- zenship, and Freedom of Expression and Alternative Sources of Information separately, we anchor this new index directly in Dahl’s(1971) extremely influential theoretical framework. The paper describes how the five polyarchy components were measured and provides the rationale for how to aggregate them to the polyarchy scale. We find Previous versions of this paper were presented at the APSA Annual Meeting in Washington, DC, August 28- 31, 2014, at the Carlos III-Juan March Institute of Social Sciences, Madrid, November 28, 2014, and at the European University Institute, Fiesole, January 20, 2016. Any remaining omissions are the sole responsibility of the authors. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s12116-018- 9268-z) contains supplementary material, which is available to authorized users. * Jan Teorell
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