Polity data series
From Wikipedia, the free encyclopedia
The Polity data series is a widely used data series in political science research.[1] The latest version, Polity IV contains coded annual information on regime authority characteristics and transitions for all independent states (with greater than 500,000 total population) in the global state system and covers the years 1800-2006.
The 2002 paper "Conceptualizing and Measuring Democracy" claimed several problems with commonly used democracy rankings including Polity.[2]