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ACS single year files Every year the ACS produces single-year estimates for geographic areas with populations of 65,000 or more, with an annual sample size of about 3 million addresses. The geographic areas include: • All 2000 PUMAs (Public Use Microdata Areas) • School districts • States, counties, and places, including Census Designated Places (CDPs) • Congressional districts • Metropolitan and micropolitan statistical areas.
2005 ACS doesn’t include population in Group Quarter (GQ), but they are included in 2006 ACS and will be in subsequent years
The ACS Design and Methodology paper has been released. This paper can be found online at: http://www.census.gov/acs/www/Downloads/tp67.pdf
The 2005 PUMS (Public Use Microdata Sample) data contain 1,259,653 housing unit records and 2,913,796 person records, which is many more records than in previous years. For 2005, the ACS selected a sample in all counties across the nation, including all municipios in Puerto Rico. 2005 PUMS are based on a subset of the 2005 ACS sample. The population estimates of the 2005ACS data were limited to the household population and exclude the population living in Group Quarters, etc. nursing homes, prison wards, college dormitories, military barracks and shelters.
2005 ACS base tables are the first substantial set of data tables ever to appear based on the ACS. Summaries are for geographic areas of at least 65,000 population. The group quarter segment of the population was not covered in the 2005 survey, so all figures here summarize just the household population. There are no moving averages here, just tables based on a single year of surveys. These data were being released in "waves" during the summer and fall of 2006. Base tables were grouped in 4 waves as they were being released in different schedules: Wave1 - Demographic & Social Characteristics; Wave2 – Economic Characteristics; Waves3 – Housing Characteristics; Wave4 – Selected Population Profiles for Race, Ethnic, & Ancestry Groups. There two types of base table provide here, B table and C table; a C table is a collapsed version of a B table with the corresponding table-code.
The 2006 PUMS data contain 1,277,561 housing unit records and 2,923,336 person records from households and 81,151 person records from Group Quarters (GQs). For 2006, the ACS selected a sample of housing units (HUs) and GQs in all counties across the nation, and all municipios in Puerto Rico. To access 2006 ACS PUMS for other states, please contact data archivist, or visit http://factfinder.census.gov/home/en/acs_pums_2006.html
The 2006 ACS Summary File includes all detailed tables for all geographies published by the 2006 ACS, which contains a total of 1261 unique detailed tables (a.k.a. “base tables” with the letter “B”); of these tables, ID’s beginning with the letter “C” are collapsed versions of tables (i.e. these tables have fewer detailed cells). The 2006 ACS-SF includes the Group Quarters (GQ) population for the first time. The 2006 ACS-Summary File posted on our website only contains the estimate data, the margins of error data & standard errors data were not included here. The ACS-Summary File's FTP server of Census Bureau contains all 3 types of format data in ASCII files.
For users who need to extract 2006 ACS-SF datasets by variables in SAS format, we recommend you the Missouri Census Data Center website
Check more documents: ACS 2005 Summary File: Technical Documentation (Prototype) [PDF 775k] |
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