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American Community Survey (ACS) 3-Year estimates Beginning in December 2008, the Census Bureau releases 3-year averages estimates for areas with populations greater than 20,000. These estimates are based on data collected over a 3-year period of time and therefore they describe the average characteristics for that 3-year time period. There are over 13,500 geographic areas that meet the 20,000 or more population threshold for the 3-year estimates. The geographic areas in 3-year averages estimates include: - State - County - County subdivision - Place - Metropolitan statistical area - Combined statistical area - New England City and Town Area (NECTA) - Urban area - Congressional district (110th Congress) - Public Use Microdata Area (PUMA) - School Districts More documents:
http://www.census.gov/acs/www/Downloads/tp67.pdf
http://www.census.gov/acs/www/UseData/myeoverview.html
http://www.census.gov/acs/www/AdvMeth/Multi_Year_Estimates/overview.html Group Quarter (GQ) is a living quarter in which unrelated people live or stay other than the usual house, apartment, or mobile home, etc. nursing homes, hospitals, prison wards, college dormitories, military barracks and shelters.
The 2005-2007 3-Year ACS-Summary File contains exactly the same table format and content as the 2007 ACS Summary File, which is a total of 1369 unique detailed tables (a.k.a. “base tables”). Of these tables, ID’s beginning with the letter “C” are collapsed versions of tables (i.e. these tables have fewer detailed cells). However, the 2005-2007 estimates are averages over the period from January 1, 2005 to December 31, 2007. The ACS did not begin full implementation for group quarters until 2006. Thus, the 2005-2007 group quarters estimates use only data collected in the years 2006 and 2007. 2005-2007 3-Year estimates includes all geographies published by the 2005-2007ACS that means it includes more geographic areas than 2007 ACS-SF does. The 2005-2007 3-yr ACS-Summary File posted on our website contains the estimate data & the margins of error data in SAS, SPSS & STATA format. For users who need to extract ACS-SF datasets by variables in SAS format, we recommend you the Missouri Census Data Center website http://mcdc2.missouri.edu/cgi-bin/uexplore?/pub/data/acs2007
2005-2007 3-Yr ACS PUMS for WA
This 3-year public use microdata sample (PUMS) for 2005-2007 is a subset of the 2005-2007 American Community Survey (ACS) and Puerto Rico Community Survey (PRCS) samples Note that microdata records in this sample do not contain names, addresses, or any information that can identify a specific housing unit, GQ or person. The smallest geographic unit that is identified is the Public Use Microdata Area (PUMA). Maps for PUMAs can be found on the Census Bureau’s website at http://www.census.gov/geo/www/maps/puma5pct.htm. The 2005–2007 American Community Survey Three-Year PUMS file contains the same sample as the three 1-year PUMS for 2005, 2006 and 2007. It contains three years of data for housing units and the population from households. However, because group quarters (GQs) were not included in the 2005 American Community Survey, this file includes two years (2006, 2007) of data for the group quarters (GQ) population. The 2005-2007 PUMS data has 3,830,606 housing unit records and 8,783,474 person records from households and 162,830 person records from GQs. To access 2005-2007 3-Yr ACS PUMS for other states, please contact data archivist, or visit http://factfinder.census.gov/home/en/acs_pums_2007_3yr.html |
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