Industry detail across censuses and surveys do not always match.
For example, the 2003-2006 Annual Survey of Manufactures (ASM) and the 2002 Economic Census were both published on a 2002 North American Industry Classification System (2002 NAICS) basis.
However, in the ASM, many "real" NAICS codes were combined into "pseudo" NAICS codes. This substantially impacts the comparability of the data.
To confirm that data are comparable, data users need to review:
Coverage of industries published across censuses and surveys do not always match.
For example, agriculture is included in County Business Patterns but not the economic census.
To confirm that the higher-level totals are comparable, data users need to review:
Types of businesses included in one survey do not always match businesses included in another.
For example, nonemployers AND employers are included in the Economic Census of Island Areas data for American Samoa but employers only for other the island areas.
To confirm that data are comparable, data users need to review:
Some published data from censuses and surveys are a combination of collected data and administrative data, while others solely use administrative data their source.
Data users need to understand:
Similar data are often published for same time period but released significant time apart.
For example, the 2007 County Business Patterns is published in July 2009 while the 2007 Economic Census is published from 2009 to 2011.
Data users need to understand: