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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

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

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?

microdata versus summary data
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
slide4

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.

slide5

Microdata

Source: 2000 Census PUMS.

slide6

Microdata

Source: 2000 Census PUMS.

overview of the acs
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
basic acs statistics
Basic ACS statistics
  • Samples approximately 2.9 million addresses per year
  • 21 questions about housing unit

48 questions about each person

acs data products
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
slide10

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

less obvious benefits of acs
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
ipums public data samples
IPUMS – Public Data Samples

Integrated -consistent codes, labels, and documentation

Public Use -anonymized, downloadable

Microdata -individual-level

Series -pooled data over time and place

ipums usa
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
acs in ipums usa extremely popular
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”)
ipums international
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
acs in ipums international not as popular
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?

contact information
Contact Information

Trent Alexander

j.trent.alexander@census.gov

ACS User Support

acso.users.support@census.gov

IPUMS User Support

ipums@pop.umn.edu