the american community survey (acs)
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The American Community Survey (ACS). Lisa Neidert NPC Workshop : Analyzing Poverty and Socioeconomic Trends Using the American Community Survey June 22 – June 26, 2009. What is the ACS?. A large, continuous survey - PowerPoint PPT PresentationTRANSCRIPT
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The AmericanCommunity Survey (ACS)
Lisa NeidertNPC Workshop: Analyzing Poverty and Socioeconomic Trends Using the American Community Survey
June 22 – June 26, 2009
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What is the ACS?
A large, continuous survey Produces single and multiyear estimates of
the characteristics of the population and housing
Produces information for small areas including tracts, block groups and population subgroups
Key component of the decennial census program
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Origins of the ACS
More timely data Operational reasons
Steadier funding Year-round Interviewing
Skilled interviewers instead of temps Strengthen Decennial Census
Improved census geography Updated address files
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More timely data
Mariel Boat Lift Natural disasters
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More timely data . . .
Communities Populations
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ACS Implementation
Demonstration Period 1996-2004
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ACS Implementation
Full implementation: 2005* Every county nationwide Products released in 2006 Annual updated data products released
every year thereafter
*Did not include group quarters in 2005
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Data Release Timetable
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Sample Specifics
3,000,000 addresses 250,000 a month
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ACS Operations: Mixed Mode
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ACS Operations
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Combination of Modes: October 2006 sample panel
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Workloads and Costs by Mode
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ACS is mandatory
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Survey Response
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Distribution of Interview OutcomesVariation in Selected States
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Interpreting ACS data
Universe and Residence Rules Time periods Reference periods
Comparison Guidelines http://www.census.gov/acs/www/UseData/compAC
S.htm
ACS Compass Products Appendices
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ACS Universe
Total resident population of the United States
Group Quarters population added to the sample in 2006
Example Ann Arbor, MI, 2006: 112,371 Ann Arbor, MI, 2005: 98,743 Ann Arbor, MI, 2000: 114,024
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Residence Rules
Resident of the housing unit if: Lives there year round Lives there more than 2 months but not year round Is living there now with no other place to live Is away now for 2 months or less
Not a resident of the housing unit if: Lives there 2 months or less with another
residence Is away now for more than 2 months
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Reference Periods
ACS uses the interview data as the single reference point, or as the end of a reference period, for all data collection Interviewed in October 2006
Earnings reference period: October 1, 2005 – September 30, 2006
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Data Products: Annual
Tabular Profiles Narrative Subject Geographic Comparison Ranking Detailed
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Data Products Annual
Microdata 1%
~1,300,000 housing records ~3,000,000 person records
Microdata are a sample of the ACS respondents Approximately 65 of 100 Confidentiality measure
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Data Products Multi-year
Combines 3 years worth of data, with a few modifications to the underlying data
Summary data GQ population is estimated for 2005 Geographic boundary changes reflected for all
years
Microdata Re-weight Index income
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Data Products: Multi-year
3-year: 2006 - 2008 Release dates: August 2009+
Multiyear Estimates Study 5-year; 3-year; 1-year For test communities only
34 counties
http://www.census.gov/acs/www/AdvMeth/Multi_Year_Estimates/overview.html#noteforusers
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Microdata vs Tabular
Census Bureau website emphasizes tabular data via American FactFinder FTP is interface to microdata
Exceptions Workshop
Micro (65%) Tabular (35%)