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 services industries. This process is performed
- 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
- redistribute burden for small and medium size businesses
The current Monthly Wholesale Trade Survey sample was introduced with the release of estimates for September 2006
on November 21, 2006.
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.
Monthly Wholesale Trade Survey estimates will be based on the
new sample effective with our annual revision release in May 2013.
The size of the current (BSR-12) Monthly Wholesale Trade Survey
sample is approximately 4,200 employer firms. The size of the
prior (BSR-06) Monthly Wholesale Trade Survey sample is approximately
4,500 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/wholesale/pdf/mwts/methods/MWTS_Stratification.pdf.
There was no change to the Wholesale sector NAICS definitions
between 2002 and 2007, so there is no impact on the estimates.
For more information on NAICS, please see http://www.census.gov/eos/www/naics/.