This new democracy index is directly anchored in Dahl’s (1971) extremely influential theoretical framework. The paper describes how the five polyarchy components were measured, provides the rationale for how to aggregate them to the polyarchy scale, and assesses the measure’s validity.
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Teorell on measuring of democracy
In the recently-published article “Measuring Polyarchy Across the Globe, 1900-2017”, Jan Teorell, together with Michael Coppedge, Staffan Lindberg and Svend-Erik Skaaning, presents a new measure of polyarchy for a global sample of 182 countries from 1900 to 2017 based on the Varieties of Democracy (V-Dem) expert poll data.