“25 Years of IPUMS Data,” the current IPUMS/MPC archive exhibit, highlights a dynamic quarter center history of data innovation at the University of Minnesota. In the late 1980s, the Social History Research Laboratory at the University of Minnesota’s History Department proposed “the creation of a single integrated microdata series composed of public use samples for every year … with the exception of the 1890 census, which was destroyed by fire.” The primary aim was to make the U.S. census microdata “as compatible over time as possible while losing little, if any, of the detail in the original datasets” (Integrated Public Use Microdata Series: A Prospectus).
Data Integration
Wrangling International Census Tables
IPUMS-International currently disseminates census microdata from 82 countries around the world. It’s an impressive collection. But it still only covers about half the world’s countries. Under the TerraPop project, we are working to assemble a truly comprehensive global collection of population data.
New IPUMS CPS Variable Links Records Across Data Files
IPUMS CPS has added a new variable to unlock longitudinal information in CPS data called CPSIDP. The identifier, the result of a major initiative from the Minnesota Population Center, uniquely identifies individuals who are in the CPS and is assigned to the individual in each of the (up to) eight times over sixteen months that the individual is in the survey.
Learning from Data: From Systemization to Investigation
Benjamin Hartman is a 2016 Summer Diversity Fellow at the MPC. As part of his fellowship, he learned how to take unprocessed data to produce harmonized IPUMS-I data and documentation, make GIS maps, and conduct his own case study investigating the spatial dimensions of internal migration using the Cambodian census. Hartman worked with his colleagues in IPUMS International to create this blog post.
A History of Data: Information Technology and the MPC
Bethel University Professor of History Diana L. Magnuson is documenting the growth of the Minnesota Population Center. Believing that preserving institutional memory is vital, the Center is supporting Magnuson’s work to capture oral histories of past and present MPC faculty and staff.
This is the second in a three-part series, with oral histories from the information technology (IT) side of the MPC. For over 16 years, the IT staff has collaborated with the MPC research staff to recode and disseminate data, develop specialized software, and make research more efficient. The “secret sauce of the MPC” is the longstanding synergistic collaboration between IT and research staff.
Data Release Details: IPUMS-DHS now includes 90 surveys from 20 African countries and India
As of May 2016, IPUMS-DHS includes over 2000 integrated variables from 90 Demographic and Health Surveys (DHS) in 21 countries, and allows researchers to select women, children, or births as their unit of analysis.
Counting—and Redefining—the Cost of War
Associate Professor of History and MPC Faculty Member J. David Hacker made headlines in 2011 when he published a groundbreaking study of the total number of U.S. Civil War dead. Hacker argued that the widely-accepted figure of 620,000 was far too low. Using IPUMS, Hacker showed that the number of dead was at least 750,000—if not more. His article, “A Census-Based Count of the Civil War,” published in Civil War History, was introduced by the editors in the issue as “among the most consequential pieces ever to appear in this journal’s pages.”
Few demographic historians expect attention from mainstream press when they publish their research, but Hacker’s study attracted national interest, including interviews with the New York Times and National Public Radio.