Kahle, Kathleen M.; Walkling, Ralph A. - In: Journal of Financial and Quantitative Analysis 31 (1996) 03, pp. 309-335
Using approximately 10,000 firms jointly covered by Compustat and CRSP from 1974–1993, we find substantial differences in the SIC codes designated by the two databases. More than 36 percent of the classifications disagree at the two-digit level and nearly 80 percent disagree at the four-digit...