This new project will create two large parallel series of historical U.S. census microdata. The first is a redesigned Integrated Public Use Microdata Series (IPUMS) incorporating Census 2000 and the American Community Survey. The IPUMS is a compatible series of large census microdata samples spanning the period from 1850 to 2000. The second is a restricted-use microdata archive containing 1.4 billion records from the censuses of 1940 to 2000. The new restricted-use archive is the product of a Census Bureau initiative to harmonize all of the bureau's decennial microdata and make them accessible through the Census Bureau Research Data Centers. The project will collaborate with the Census Bureau to create coding schemes to be used in both series that incorporate all detail in the restricted files. The two series will be developed simultaneously using the same software, methodology, and documentation.

Original languageEnglish (US)
Pages (from-to)9-20
Number of pages11
JournalHistorical Methods
Issue number1
StatePublished - Dec 2003

Bibliographical note

Funding Information:
IPUMS Redesign is an ambitious new project to overhaul the U.S. component of the Integrated Public Use Microdata Series (IPUMS). The project began in October 2002 with funding from the National Institutes of Health (HD-43392). The IPUMS is a compatible series of large U.S. census microdata samples spanning the period from 1850 to 1990. Originally designed in the early 1990s, the IPUMS must be extensively modified to accommodate new data sources and to keep up with changing technology and metadata standards. The project is still in its early stages, and our plans are subject to change. We are publishing this description in the hope that data users will respond with comments and suggestions that will help us to better meet the needs of IPUMS users. A complete copy of the proposal is available from the IPUMS Web site (http:// www.ipums.org).


  • Census
  • Census Bureau
  • Microdata


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