Why are there differences in industry definitions between 1997 and 1998 CBP data?
The North American Industry Classification System (NAICS) replaces the U.S. Standard Industrial Classification (SIC) system. NAICS was developed in a joint effort between Canada, Mexico, and the United States; it is an industry classification system that groups establishments into industries based on the activities in which they are primarily engaged. The County Business Patterns program has tabulated on a NAICS basis since 1998. The NAICS codes were updated in 2002; starting with the 2003 County Business Patterns series, the data are tabulated using the 2002 NAICS system.
