Integrating ACS with the Worlds Census Data ACS

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

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 Integrated Public Use Microdata

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? 2

Microdata versus Summary Data Microdata Summary Data • “Raw” data containing each person’s responses

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

Summary Data Source: 2009 ACS 1 -year Estimates. Table B 15003. EDUCATIONAL ATTAINMENT FOR

Summary Data Source: 2009 ACS 1 -year Estimates. Table B 15003. EDUCATIONAL ATTAINMENT FOR THE POPULATION 25 YEARS AND OVER 4 Universe: POPULATION 25 YEARS AND OVER.

Microdata Source: 2000 Census PUMS. 5

Microdata Source: 2000 Census PUMS. 5

Microdata Source: 2000 Census PUMS. 6

Microdata Source: 2000 Census PUMS. 6

Overview of the ACS • An on-going nation-wide survey providing reliable annual data •

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 7

Basic ACS statistics • Samples approximately 2. 9 million addresses per year • 21

Basic ACS statistics • Samples approximately 2. 9 million addresses per year • 21 questions about housing unit 48 questions about each person 8

ACS Data Products • Similar to decennial “long form” data • About 1, 000

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 9

Person records in ACS PUMS in ACS complete (millions) data (millions) 2001 2002 2003

Person records in ACS PUMS in ACS complete (millions) data (millions) 2001 2002 2003 2004 2005 2006 2007 2008 2009 1. 2 3. 0 3. 0 1. 3 4. 5 4. 5 Population (millions) 285 287 290 293 296 298 301 304 307 Source: B 00001. UNWEIGHTED SAMPLE COUNT OF THE POPULATION Universe: TOTAL POPULATION. B 01001. SEX BY AGE - Universe: TOTAL POPULATION 10

How does this compare to a decennial census PUMS? 11

How does this compare to a decennial census PUMS? 11

Census 2000 PUMS Geographic Detail ACS PUMS Areas of 100, 000+ % Sample per

Census 2000 PUMS Geographic Detail ACS PUMS Areas of 100, 000+ % Sample per decade 6% 10% Data collection period ~4 months 1+ years 12

Less obvious benefits of ACS • Permanent staff – high-quality data collection – consistent

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

What do PUMS users think? 14

IPUMS – Public Data Samples Integrated - consistent codes, labels, and documentation Public Use

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

http: //www. ipums. org/ 16

IPUMS-USA • Samples from United States and Puerto Rico • U. S. decennial census

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

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ACS in IPUMS-USA: Extremely popular • Most requested IPUMS-USA sample this year: 2008 ACS

ACS in IPUMS-USA: Extremely popular • Most requested IPUMS-USA sample this year: 2008 ACS PUMS • About half of all extracts include ACS data • 2 nd most common search term leading to website: “ipums acs” (most common is “ipums”) 20

IPUMS-International • World’s largest collection of public census data • Has 159 census samples

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 21

ACS in IPUMS-International: Not as popular • 2005 ACS not among the most requested

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? 22

Contact Information Trent Alexander j. trent. alexander@census. gov ACS User Support acso. users. support@census.

Contact Information Trent Alexander j. trent. [email protected] gov ACS User Support acso. users. [email protected] gov IPUMS User Support [email protected] umn. edu 23