Census of Population and Housing, 1990 [United States]: Public Use Microdata Sample: 1-Percent Sample (ICPSR 9951)
Published: Jan 12, 2006 View help for published
Principal Investigator(s): View help for Principal Investigator(s)
United States Department of Commerce. Bureau of the Census
Summary View help for Summary
The Public Use Microdata Sample (PUMS) 1-Percent Sample contains household and person records for a sample of housing units that received the "long form" of the 1990 Census questionnaire. Data items include the full range of population and housing information collected in the 1990 Census, including 500 occupation categories, age by single years up to 90, and wages in dollars up to $140,000. Each person identified in the sample has an associated household record, containing information on household characteristics such as type of household and family income.
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Geographic Coverage View help for Geographic Coverage
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Date of Collection View help for Date of Collection
Data Collection Notes View help for Data Collection Notes
(1) Although all records are 231 characters in length, each file is hierarchical in structure, containing a housing unit record followed by a variable number of person records. Both record types contain approximately 120 variables. Two improvements over the 1980 PUMS files have been incorporated. First, the housing unit serial number is identified on both the housing unit record and on the person record, allowing the file to be processed as a rectangular file. In addition, each person record is assigned an individual weight, allowing users to more closely approximate published reports. Unlike previous years, the 1990 PUMS 1-Percent and 5-Percent Samples have not been released in separate geographic series (known as "A," "B," etc. records). Instead, each sample has its own set of geographies, known as "Public Use Microdata Areas" (PUMAs), established by the Census Bureau with assistance from each State Data Center. The PUMAs in the 1-Percent Sample are based on a distinction between metropolitan and nonmetropolitan areas. Metropolitan areas encompass whole central cities, Primary Metropolitan Statistical Areas (PMSAs), Metropolitan Statistical Areas (MSAs), or groups thereof, except where the city or metropolitan area contains more than 200,000 inhabitants. In that case, the city or metropolitan area is divided into several PUMAs. Nonmetropolitan PUMAs are based on areas or groups of areas outside the central city, PMSA, or MSA. PUMAs in this 1-Percent Sample may cross state lines. (2) The codebook is provided as a Portable Document Format (PDF) file. The PDF file format was developed by Adobe Systems Incorporated and can be accessed using PDF reader software, such as the Adobe Acrobat Reader. Information on how to obtain a copy of the Acrobat Reader is provided through the ICPSR Website on the Internet.
Sample View help for Sample
A stratified sample, consisting of a subsample of the household units that received the 1990 Census "long-form" questionnaire (approximately 15.9 percent of all housing units).
Universe View help for Universe
All persons and housing units in the United States.
Data Source View help for Data Source
Data Type(s) View help for Data Type(s)
Original Release Date View help for Original Release Date
Version Date View help for Version Date
Version History View help for Version History
- U.S. Dept. of Commerce, Bureau of the Census. CENSUS OF POPULATION AND HOUSING, 1990 [UNITED STATES]: PUBLIC USE MICRODATA SAMPLE: 1-PERCENT SAMPLE. 4th ICPSR release. Washington, DC: U.S. Dept. of Commerce, Bureau of the Census [producer], 1995. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 1998. http://doi.org/10.3886/ICPSR09951.v4
2006-01-12 All files were removed from dataset 80 and flagged as study-level files, so that they will accompany all downloads.
2006-01-12 All files were removed from dataset 85 and flagged as study-level files, so that they will accompany all downloads.
2006-01-12 All files were removed from dataset 81 and flagged as study-level files, so that they will accompany all downloads.
2006-01-12 All files were removed from dataset 82 and flagged as study-level files, so that they will accompany all downloads.
2006-01-12 All files were removed from dataset 83 and flagged as study-level files, so that they will accompany all downloads.
1998-08-28 The following data files were replaced by the Census Bureau: the state files (Parts 1-56), Puerto Rico (Part 72), Geographic Equivalency File (Part 84), and Public Use Microdata Areas (PUMAS) Crossing State Lines (Part 99). These files now incorporate revised group quarters data. Parts 201-256, which were separate revised group quarters files for each state, have been removed from the collection. The data fields affected by the group quarters data revisions were POWSTATE, POWPUMA, MIGSTATE and MIGPUMA. As a result of the revisions, the Maine file (Part 23) gained 763 records and Part 99 lost 763 records. In addition, the following files have been added to the collection: Ancestry Code List, Place of Birth Code List, Industry Code List, Language Code List, Occupation Code List, and Race Code List (Parts 86-91). Also, the codebook is now available as a PDF file.
Data in this collection are available only to users at ICPSR member institutions.
- The citation of this study may have changed due to the new version control system that has been implemented. Please see version history for more details.
This study is provided by ICPSR. ICPSR provides leadership and training in data access, curation, and methods of analysis for a diverse and expanding social science research community.