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Integrating ACS with the World’s Census Data: ACS Microdata and the IPUMS

Integrating ACS with the World’s Census Data: ACS Microdata and the IPUMS. Presented at the Pre-ALAP ACS/IPUMS Workshop November 16, 2010 Trent Alexander American Community Survey Office U.S. Census Bureau. Outline. American Community Survey (ACS) Overview and ACS PUMS

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Integrating ACS with the World’s Census Data: ACS Microdata and the IPUMS

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  1. Integrating ACS with the World’s Census Data:ACS Microdata and the IPUMS Presented at the Pre-ALAP ACS/IPUMS Workshop November 16, 2010 Trent Alexander American Community Survey Office U.S. Census Bureau

  2. Outline American Community Survey (ACS) Overview and ACS PUMS Integrated Public Use Microdata Series (IPUMS) How the ACS PUMS fits in ACS and the world’s population data heritage Does the ACS model work?

  3. Microdata versus Summary Data Microdata Summary Data Premade or published tables Enables examination of small geographic areas Limitations: limited content • “Raw” data containing each person’s responses • Enables custom tables and analyses • Limitations: geographic identifiers, fewer cases, less reliability

  4. Summary Data Source: 2009 ACS 1-year Estimates. Table B15003. EDUCATIONAL ATTAINMENT FOR THE POPULATION 25 YEARS AND OVER - Universe: POPULATION 25 YEARS AND OVER.

  5. Microdata Source: 2000 Census PUMS.

  6. Microdata Source: 2000 Census PUMS.

  7. Overview of the ACS • An on-going nation-wide survey providing reliable annual data • Conducted in every town and county • Includes housing units and group quarters

  8. Basic ACS statistics • Samples approximately 2.9 million addresses per year • 21 questions about housing unit 48 questions about each person

  9. ACS Data Products • Similar to decennial “long form” data • About 1,000 tables for each geographic area • for 370,000 areas in newest data • Annual PUMS samples for ~1% of population

  10. Source: B00001. UNWEIGHTED SAMPLE COUNT OF THE POPULATION - Universe: TOTAL POPULATION. B01001. SEX BY AGE - Universe: TOTAL POPULATION

  11. How does this compare to a decennial census PUMS?

  12. Less obvious benefits of ACS • Permanent staff • high-quality data collection • consistent standards for processing, editing, etc. • Changes are infrequent and well-documented • Ongoing support for products • Ability to fix errors and make improvements

  13. What do PUMS users think?

  14. IPUMS – Public Data Samples Integrated -consistent codes, labels, and documentation Public Use -anonymized, downloadable Microdata -individual-level Series -pooled data over time and place

  15. http://www.ipums.org/

  16. IPUMS-USA • Samples from United States and Puerto Rico • U.S. decennial census and ACS data,1850-2009 • Various specialty samples (longitudinal, oversamples) • ACS PUMS availability • All ACS samples from 2000-2009

  17. ACS in IPUMS-USA:Extremely popular • Most requested IPUMS-USA sample this year: 2008 ACS PUMS • About half of all extracts include ACS data • 2nd most common search term leading to website: “ipums acs” (most common is “ipums”)

  18. IPUMS-International • World’s largest collection of public census data • Has 159 census samples from 55 countries • Incorporating latest censuses and new countries • ACS PUMS availability • 2005 ACS PUMS only

  19. ACS in IPUMS-International:Not as popular • 2005 ACS not among the most requested samples • U.S. Census 2000 requested much more often than ACS • Will this change when 2010 round of censuses is posted? • Should IPUMS-Intl include 2010 ACS 1-year data or 2006-2010 pooled 5-year data?

  20. Contact Information Trent Alexander j.trent.alexander@census.gov ACS User Support acso.users.support@census.gov IPUMS User Support ipums@pop.umn.edu

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