These include the use of new population controls that reflect Census 2000 results and new information about net migration, the use of new questions about race and Hispanic ethnicity, the introduction of new industry and occupation classifications, improvements in the seasonal adjustment processes, and the annual update of seasonal adjustment factors. For all data series, these changes affect the comparability of the January 2003 estimates with those for earlier months. Additional detail is provided in the release at http://www.bls.gov/cps/cps_notice02a.htm
More detailed information about the revisions is available in the article "Revisions to the Current Population Survey Effective in January 2003 (PDF 133KB)"
Last Modified Date: April 1, 2003