Conceptualizing Left and Right in comparative politics

Abstract

Despite the importance of the Left-Right dimension in comparative politics, establishing an index that captures this dimension in both a theoretically and empirically sound manner remains an ongoing challenge for political scientists. Having reviewed existing attempts to construct measures for the Left-Right dimension, and having concluded that they are merely inductive and problematic from a methodological perspective, this article proposes a deductive approach based on Norberto Bobbio’s theory of Left and Right and suggests a combination with statistically robust measures drawn from the data provided by the Comparative Manifesto Project (CMP). The fundamental features of the proposed index are: first, Left and Right are theoretical concepts which should be accounted for in the empirical analysis. Second, the Left-Right dimension is time- and country-specific. Third, different statements have different meanings on a Left-Right scale. Fourth, the importance of the Left-Right dimension itself varies over time and across countries. Finally, the data have to be analysed adequately.