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Scope and Method

Survey coverage

The survey covers establishments of all sizes in private industry (excluding farms and households) and the public sector (excluding federal government) for all of the United States.

Sample design

The sample is selected based on a probability-proportionate-to-size (PPS) technique. Larger establishments have a higher chance of selection than smaller establishments, however, smaller establishments are selected frequently enough to be representative of that size class. The sampling frame is developed primarily from lists of establishments provided by state unemployment insurance agencies.

Once an establishment is selected, occupations from within that establishment are selected, again using the PPS sampling technique.

Data Collection

Initial data are obtained in a personal visit by an BLS field economist from one of our eight regional offices. Thereafter, data are updated quarterly, usually by mail and/or telephone.


Data collected or maintained by the Bureau of Labor Statistics under a pledge of confidentiality shall be treated in a manner that will assure that individually identifiable data will be accessible only to authorized persons (BLS employees) and will be used only for statistical purposes.


Last Modified Date: October 16, 2001