1 the american community survey an update pamela klein american community survey office washington...
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The American Community SurveyAn Update
Pamela KleinAmerican Community Survey Office
Washington Metropolitan Council on Governments
Cooperative Forecasting and Data CommitteeWashington, DC
January 9, 2007
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Purpose of the ACS
• Collect detailed Census sample data every month instead of only once each decade
• Release tabulations of these data on a yearly basis
• Restructure and simplify the 2010 Census
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Release schedule for the ACS Data Products
Data products are released in the year following the single-year or multi-year period in which data are collected.
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2005 Geographic AreasType of Legal, Administrative, or Statistical Area
Number included in
2005 ACS for the United
States
Number included in 2005 ACS for Puerto
Rico
Percent of
All Such Areas
Nation 1 -- 100%
States (including DC and Puerto Rico)
51 1 100%
Census Regions and Census Divisions
13 -- 100%
Congressional Districts 436 1 100%
Urban/Rural State Components (excluding DC)
50 1 100%
Public Use Micro Data Sample Areas
2,071 30 100%
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2005 Geographic AreasType of Legal, Administrative, or
Statistical Area
Number included in
2005 ACS for the United
States
Percent of
All Such Areas
Number included in 2005 ACS for Puerto
Rico
Percent of
All Such Areas
Metropolitan, Micropolitan and Combined Statistical Areas
612 58% 11 69%
Counties and Municipios 776 25% 12 15%
School Districts 995 7% 1 100%
Places 469 2% 7 3%
American Indian and Alaska Native Areas
15 2% -- --
Minor Civil Divisions 188 2% -- --
Other Geographic Areas 3,934 3% 24 53%
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Sampling Error
• Sampling error occurs when estimates are derived from a sample rather than a census of the population.
• Standard error is an estimate of the precision of the estimates.
• The margin of error describes the precision of the estimate for a given confidence level and standard error.
• Tools used to prevent incorrect conclusions
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Margin of Error
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Statistical Significance
• Small differences may be insignificant.
• To do statistical testing of two estimates, you must calculate the standard error of the difference of the estimates.
• Two estimates are "significantly different" if their difference is large enough that there was a less than 10 percent chance that the difference was purely random.
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Using ACS Data
• ACS data are comparable to Census 2000
• Comparing 2005 ACS data with 2004 ACS data
• Percentage distributions
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Reference Materials
• ACS Data User Training Guide
• ACS Design and Methodology technical document
• Using Data From the 2005 ACS
http://www.census.gov/acs/www/
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Data Products
• Detailed Tables • Data Profiles• Narrative Profiles• Ranking Tables• Thematic Maps• Geographic Comparison Tables• Subject Tables • Selected Population Profiles
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http://factfinder.census.gov/home/en/acs_pums_2005.html
Public Use Microdata Sample (PUMS)
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2005 User’s Guidehttp://www.census.gov/acs/www/Products/users_guide/index.htm
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Thematic Maps
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Data Profiles
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Geographic Comparison Tables
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Selected Population Profiles
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Detailed TablesUsing the “options” tab, you can display information by different geographic components, such as urban and rural.
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For More Information
American Community Survey Office1-888-346-9682
[email protected]/acs/www
U.S. DEPARTMENT OF COMMERCEU.S. Census Bureau
Washington, DC 20233
ACS Alerthttp://www.census.gov/acs/www/Special/Alerts.htm