Comparing the Data Sets

cross-national data sets on democracy. Whereas the main body of this article is organized around the four traditions, this appendix is structured around the resulting insights into the six data sets that have been examined. A substantial literature has assessed democracy measures from diverse perspectives (Munck & Verkuilen, 2002; Munck, 2009), and the discussion below considers only issues of measurement validation. The assessment is also partial, because some indicators have not been evaluated from the standpoint of all four traditions of validation. Nevertheless, the observations below may suggest productive avenues for future work.