IPUMS USA: Version 8.0 Extract of 1940 Census for U.S. Census Bureau Disclosure Avoidance Research

The U.S. Census Bureau is using the 1940 Census full enumeration from IPUMS USA as one of the test microdata files supporting the development of the differential privacy method for confidentiality protection system for the 2020 Census. When the Census Bureau releases algorithms and code for testing the 2020 Census system, those programs will also work on this extract from the 1940 Census. The Census Bureau urges all external testers of its algorithms to also use these 1940 microdata files so that differences in the inputs will not be a source of uncontrolled error in such analyses. Further instructions from the Census Bureau will accompany any public algorithm or code release.