Weiner, Christian - Sonderforschungsbereich 649: Ökonomisches Risiko, … - 2005
each classification is to determine a balance between aggregation of similar firms and differentiation between industries …. This paper examines the structure and content of industrial classification schemes and how they affect financial research …. I use classification systems provided by the Worldscope and the Compustat database. First, this study gives a detailed …