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|Sponsor:||U.S. Department of Commerce/U.S. Census Bureau|
|Description:||The Decennial Census occurs every 10 years to count the population and
housing units for the entire United States. Its primary purpose is to provide
the population counts that determine how seats in the U.S. House of
Representatives are apportioned. The U.S. Census Bureau provides three types
of data products that may be useful to the interested researcher:
Tabular data: Summary files
The U.S. Census Bureau has released a series of summary files that present Census 2000 data in tabular form. The primary summary files are:
Raw data: 1 percent and 5 percent PUMS files
The PUMS files contain records of households, people, or housing units with identifying information removed and other precautions taken to prevent the violation of confidentiality. PUMS files often show data only for identified geographic areas (such as states) that meet a certain population threshold. The 1 percent PUMS files have state-level Census 2000 data containing individual records of the characteristics for a 1 percent sample of people and housing units. The 5 percent PUMS files contain similar information for a 5 percent sample of people and housing units.
Census briefs and special reports
The Census 2000 Brief series focus on discussing key topics covered by the Census and exploring the geographic distribution of the topics. The Census 2000 Special Report series provides an in-depth analysis of Census 2000 population and housing topics.
Examples of census briefs and special reports of particular interest include:
|Relevant Policy Issues:||Demographic and Economic Indicators, Measurement of Health Status, Income Status, Unemployment Rates, Economic Assistance Program Participation Rates, Educational Attainment, Measures of Well-being for Families/Households, Factors Contributing to Well-being Disparities of Families, Housing Quality, Type of Housing, Housing Ownership, Rental Unit Quality and Cost, and Transportation Availability.|
|Data Type(s):||Census survey|
|Unit of Analysis:||Individual|
|Identification of AI/AN/NA:||As described above, identification of the AI/AN/NA population
differs across the many Census 2000 data products. Some data products present
the AI/AN/NA population into 2 groups: American Indian/Alaskan Native and
Native Hawaiian/Other Pacific Islander while other data products provide
more detailed breakdowns (e.g., distinction between American Indians and
Alaska Native, distinction between Native Hawaiian and other Pacific Islanders).
Some data products provide detailed breakdowns of these groups presenting
data for different tribal affiliations and different Pacific Islander groups.
For example, the PUMS files, the AIANSF file, and Summary Files 2 and 4 present
tribal affiliation data.
Please note that the tribal affiliation data reflect the written entries by respondents, who identified themselves as AI/AN, and provided an entry for their enrolled or principal tribe or village. Some of the responses (for example, Colorado River and Village of Alakanuk) represent reservations or native villages. The information on tribe or village is based on self-identification without consideration of any designation of federal or state recognition.
|AI/AN/NA Population in Data Set:||The following counts are reported in Profiles of General
Demographic Characteristics: 2000 Census of Population and Housing. These
data are based on 100 percent counts derived from the Census 2000 short form:
Total population: 281,421,906
|AI/AN/NA Subpopulations:||As described in detail above, some data products provide detailed breakdowns (e.g., distinction between American Indians and Alaska Native, distinction between Native Hawaiian and other Pacific Islanders) and some present data for different tribal affiliations and different Pacific Islander groups.|
|Geographic Scope:||The geographic scope of the study is national. Geographic
areas covered by the data in the Census 2000 summary files include:
Geographic areas covered by the Census 2000 PUMS data include:
|Date or Frequency:||The Census is conducted every 10 years in years ending in zero. The next census is scheduled for 2010. Data are available for each year since 1790. American Indians were first enumerated as a separate group in the 1860 Census. The 1890 census was the first to count American Indians, including some tribes, throughout the country.|
|Data Collection Methodology:||Census 2000 data were collected by mail, telephone, personal interview, and Internet.|
|Response Rate:||The national final response rate for Census 2000 was 67 percent and represents responses received by mail, telephone or over the Internet through September 7, 2000. The final response rates for 117 American Indian Areas are listed at the following website: http://www.census.gov/dmd/www/response/disp-fro-res.txt.|
|Basic demographic and housing questions (for example, race, age, and relationship to householder) were asked for every person in all housing units in the United States. A sample of housing units was also selected to receive more detailed questions in the long form of Census 2000, containing items such as income, occupation, and housing costs. The sampling unit for the long form Census 2000 was the housing unit, including all occupants. There were four different housing unit sampling rates: 1-in-8, 1-in-6, 1-in-4, and 1-in-2 (designed for an overall average of about 1-in-6). The Census Bureau assigned these varying rates based on precensus occupied housing unit estimates of various geographic and statistical entities, such as incorporated places and interim census tracts. For people living in group quarters or those enumerated at long-form-eligible service sites (shelters and soup kitchens), the sampling unit was the person and the sampling rate was 1-in-6.|
|Analysis:||Detailed information regarding the design effects and standard errors for each of the 2000 Census PUMS files and the summary files is available for download from online links on the Census 2000 website.|
|Authorization:||The Census is mandated by the U.S. Constitution, Article I, Section 2. Participation in the Census is required by law set forth in Sections 141 and 193 of Title 13 of the United States Code.|
|Strengths:||The Census 2000 PUMS files and summary files contain a representative sample of the AI/AN population and selected tribes and villages. The Census 2000 PUMS files and summary files also contain a representative sample of the NH/PI population with some data products providing information on select OPI groups. Data are collected on key policy issues. The U.S. Census Bureaus website provides extremely comprehensive documentation on the methodology, results, and interpretation of census data.|
|Limitations:||The Census 2000 PUMS files are a very large set of complex files. Considerable expertise in working with data of these types will likely be required. The summary files are less complex but more numerous, thus finding the particular table(s) of interest may be challenging.|
|Access Requirements and Use Restrictions:||Both the PUMS data and the summary files are available to the public at no cost.|
|Contact Information:||A U.S. Census Bureau list of contacts by subject area is
available at the following website:
The Census 2000 summary files as well as supporting documentation are available at the U.S. 2000 Census website: http://factfinder.census.gov/servlet/DatasetMainPageServlet?_program=DEC&_submenuId=datasets_1&_lang=en.
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Human Services Policy (HSP)
Assistant Secretary for Planning and Evaluation (ASPE)
U.S. Department of Health and Human Services (HHS)