How did the conversion to the 1997 North American Industry Classification System (NAICS) affect the NIPA estimates?
In the 2003 comprehensive revision, the estimates of income and employment-by-industry were converted to the 1997 North American Industry Classification System. The increased detail provided by NAICS improves the placement of primary activities among NIPA subcomponents, and because of the differences between NAICS and the Standard Industrial Classification (SIC), the methodologies used to estimate some NIPA components changed. The income and employment-by-industry tables that were affected by this conversion are Tables 6.1-6.22. The SIC and the NAICS overlap years for these tables is 1998-2000. Annual estimates are presented on a NAICS basis beginning with 1998. Personal consumption expenditures and private fixed investment in equipment and software are classified by type of product rather than by industry, thus the conversion to the NAICS standard did not directly impact these estimates. However, since some components within personal consumption expenditures and private fixed investme
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