A sample revision is the process used to re-design and re-select the samples for many of the Census Bureau’s surveys of the retail, wholesale, and service industries. This process is performed to
- ensure each sample is representative of its target population
- improve the efficiency of each sample
- incorporate updates to the industry classification structure
- expand industry coverage of the survey
- update questions and instructions to obtain more accurate data, and
- redistribute burden for small and medium size businesses
The current Service Annual Survey sample was introduced in February 2007 with the release of estimates for reference year 2005.
Sample revisions are performed approximately every 5 to 7 years. During the period for which the samples are used, updates are made on a quarterly basis to reflect changes in the business universe. These updates are designed to account for new businesses (births) and businesses which discontinue operations (deaths). The samples are also updated to reflect mergers, acquisitions, divestitures, splits, and other changes to the business universe.
Service Annual Survey estimates will be based on the new sample
effective with the release of estimates for the 2011 reference
year in January 2013.
The size of both the new and the current Service Annual Survey sample is approximately 72,000 employer firms.
In most cases, yes. Whenever possible, estimates from different samples have been put on a comparable basis. For a detailed description of the process used to link the estimates from different samples and for specific information on which industry estimates are not comparable, please refer to http://www.census.gov/services/sas/sastechdoc.html.
NAICS is scheduled to be reviewed every 5 years for potential revisions, so that the classification system can keep pace with the changing economy. Service Annual Survey estimates are currently published on a 2002 NAICS basis. Effective with the release of 2011 estimates in the first quarter of 2013, Service Annual Survey estimates will be published on a 2007 NAICS basis.
The changes between 2002 NAICS and 2007 NAICS that affect industries within the scope of the Service Annual Survey are summarized below.
- Sector 51, Information- Telecommunications Resellers and Cable and Other Program Distribution were moved, Internet Service Providers and Web Search Portals industries were restructured, and a new six-digit industry was created in Other Information Services subsector.
- Sector 53, Real Estate and Rental and Leasing- 2002 NAICS code 525390- Real Estate Investment Trusts, was deleted and portions of it were reclassified as follows: (1) Equity REITs is classified in the Real Estate subsector in NAICS Industry Group 5311- Lessors of Real Estate, under individual national industries based on the content of the portfolio of real estate operated by a particular REIT; and (2) Mortgage REITs is moved to NAICS 525990, Other Financial Vehicles.
- Sector 54, Professional, Scientific, and Technical Services - Research and Development in Biotechnology was added as a 6-digit industry.
- Sector 56, Administrative and Support and Waste Management and Remediation Services - Establishments that primarily provide executive search consulting services were moved to a new 6-digit industry, Executive Search Services.
For a more detailed comparison between the 2002 and 2007 NAICS, please see the NAICS Concordance Tables.