Each year, the Labor Market Information Division revises historical industry employment, labor force, and hours and earnings data for California, counties, metropolitan areas (Metropolitan Statistical Areas or Metropolitan Divisions), and other sub-state areas. This revision, also called a "benchmark," reflects updates to the data sets used to generate the monthly estimates. See "What is a Benchmark?
" for a description.
The revised data for California and the Los Angeles-Long Beach-Glendale Metropolitan Division (Los Angeles County) only
were released on March 5, 2010, along with the release of the January 2010 data. EDD derives its industry jobs and labor force data using nationally mandated statistical models. These models rely on several data inputs which are updated during our annual benchmark. Nationwide, processing of these inputs has proved to be more time consuming than expected, resulting in a later release of local area information. EDD anticipates releasing local industry and labor force data for all other areas on Wednesday, March 10, 2010
The labor force estimates data have been revised back to 1976 instead of the normal five years because of the introduction of a smoothed-seasonally adjusted estimation procedure. This has been introduced by the Bureau of Labor Statistics (BLS) to address customer concerns with month-to-month volatility that had been introduced into the data series with the introduction of third generation Local Area Unemployment Statistics (LAUS) models in 2005. For more information on the methodological changes, see the BLS web site at www.bls.gov/lau/lassaqa.htm
The seasonally adjusted industry employment estimates data have been revised back to 1990. In January 2009, BLS began a review process in an attempt to bring the sum of state employment estimates closer into alignment with the national employment estimates. With this revision, additional controls are being implemented to further this process. While these controls may increase month-to-month volatility in individual industry estimates, they will further BLS' stated aim of generating a more accurate measurement of error for the total nonfarm estimate. For more information on the methodological changes, see the BLS web site at www.bls.gov/sae/cesprocs.htm