A Global Measure of Judicial Independence, 1948–2012

We present a new cross-national measure of de facto judicial independence, which is available for 200 countries from 1948 to 2012. To do so, we introduce a statistical measurement model for uncovering latent concepts commonly encountered in time-series, cross-sectional analyses in comparative politics and international relations. Our approach addresses unique challenges that arise in these data: temporal dependence in the observed and unobserved variables, conceptual boundedness in the latent quantity, and substantial missing data and measurement error in the observable indicators. The resulting measures match a common conceptual definition of independence with greater reliability than existing alternatives. The model is extensible to many concepts in comparative politics and international relations.