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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 to:
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/.