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  1. The American Community SurveyAn Update Pamela Klein American Community Survey Office Washington Metropolitan Council on Governments Cooperative Forecasting and Data Committee Washington, DC January 9, 2007

  2. 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

  3. 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.

  4. 2005 Geographic Areas

  5. 2005 Geographic Areas

  6. 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

  7. Margin of Error

  8. 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.

  9. Using ACS Data • ACS data are comparable to Census 2000 • Comparing 2005 ACS data with 2004 ACS data • Percentage distributions

  10. Reference Materials http://www.census.gov/acs/www/ • ACS Data User Training Guide • ACS Design and Methodology technical document • Using Data From the 2005 ACS

  11. Data Products • Detailed Tables • Data Profiles • Narrative Profiles • Ranking Tables • Thematic Maps • Geographic Comparison Tables • Subject Tables • Selected Population Profiles

  12. Public Use Microdata Sample (PUMS) http://factfinder.census.gov/home/en/acs_pums_2005.html

  13. 2005 User’s Guide http://www.census.gov/acs/www/Products/users_guide/index.htm

  14. Thematic Maps

  15. Data Profiles

  16. Geographic Comparison Tables

  17. Selected Population Profiles

  18. Using the “options” tab, you can display information by different geographic components, such as urban and rural. Detailed Tables

  19. For More Information American Community Survey Office 1-888-346-9682 cmo.acs@census.gov www.census.gov/acs/www ACS Alert http://www.census.gov/acs/www/Special/Alerts.htm U.S. DEPARTMENT OF COMMERCE U.S. Census Bureau Washington, DC 20233