IPUMS International -- Fun with Census Microdata Peter Clark IT Core Director Minnesota Population Center University of Minnesota http://www.pop.umn.edu http://www.ipums.org
Jul 23, 2015
IPUMS International -- Fun with Census Microdata
Peter Clark IT Core Director Minnesota Population Center University of Minnesota
http://www.pop.umn.edu http://www.ipums.org
So what?§ IPUMS = Integrated Public Use Microdata Series
§ We clean it up, integrate it, and document it (in English), so you don’t have to.
§ What can you do with integrated census microdata?
- Compare things across time and geography - Compare things across specific subgroups of people or household
configurations
§ Lots of cases means that it’s easy to get statistical significance when you find a real effect.
Selected Research/Use Cases§ Demographic Transition from the point of view of children
FIGURE 7. Cumulative distribution of siblings of children aged 9-11, eight countries: Proportionwith specified number of surviving children or fewerSOURCE: Estimates from IPUMS-International census microsamples (Minnesota PopulationCenter 2007).
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Selected Research/Use Cases§ Is the “Nuclear Family” an exceptional trait in NW European households?
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Selected Research/Use Cases§ How accurate is US Census Public Use Microdata? 18
Figure 1. Population estimates from 2000 5% Census PUMS as a percentage of published data
80%
85%
90%
95%
100%
105%
110%
115%
120%
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90+
Men
Women
Sources: Census 2000 Summary File 4, Table PCT3 (http://factfinder.census.gov); Census 2000 5% sample, IPUMS-USA (http://usa.ipums.org/).
Figure 2. ACS 2006: Population estimates from PUMS as a percentage of published data
80%
85%
90%
95%
100%
105%
110%
115%
120%
<5 5-9 10-
14
15-
17
18-
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20 21 22-
24
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29
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34
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39
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85+
Age groups
Men
Women
Sources: 2006 ACS Table B01001 (http://factfinder.census.gov); 2006 ACS PUMS, IPUMS-USA (http://usa.ipums.org/).
End
§ Just a sample of what people are doing with IPUMS data; there are over 4K hits for IPUMS in Google Scholar.
§ Access to a big collection of comparable population data lets us play with a variety of interesting questions that were difficult to explore quantitatively before.
Citations for use cases§ 1. Lam, David and Letícia Marteleto. 2008.
- "Stages of the Demographic Transition from a Child’s Perspective: Family Size, Cohort Size, and Children’s Resources"
- Popul Dev Rev. 2008 ; 34(2): 225–252. doi:10.1111/j.1728-4457.2008.00218.x.
§ 2. Ruggles, Steven. 2009. - “Reconsidering the Northwest European Family System.” - Population and Development Review 35: 249-273. - Downloaded from http://www.hist.umn.edu/~ruggles/PDR/
§ 3. Alexander, J. Trent, Michael Davern, and Betsey Stevenson. 2010. - "Inaccurate Age and Sex Data in the Census PUMS Files: Evidence and
Implications." - National Bureau of Economic Research Working Paper No. 15703.