URL: http://ssdc.ucsd.edu/ssdc/icp09951.html

TITLE: Census of Population and Housing, 1990 [California Reformatted Data]: Public Use Microdata Sample [1% and 5% PUMS]

• STUDYNO = icp09951 and icp09952 (SSDC Edition)
• INVESTIGATOR = United States Department of Commerce. Bureau of the Census
• DATA SOURCE = Self-enumerated questionnaires
• UNIVERSE = All persons and housing units in the United States
• DATE-UPDATED-SSDC = June 21, 2006

STUDY DESCRIPTION: Public Use Microdata Sample (PUMS) files contain records representing 1-percent or 5-percent samples of the occupied and vacant housing units in the U.S. and the people in the occupied units. Group quarters people also are included. The file contains individual weights for each person and housing unit, which when applied to the individual records, expand the sample to the relevant total. Microdata are for those users who want to create do-it-yourself tabulations. Microdata files show the full range of responses made on individual questionnaires. For example, how one household or one household member answered questions on occupation, place of work, and so forth. The files contain records for a sample of all housing units, with information on the characteristics of each unit and the people in it. For more information about these data, see the PUMS codebooks.

REFORMATTED DATA FILES: The source of these data files is the Inter-University Consortium for Political and Social Research (ICPSR 9951 and 9952). There are four data files, 2 each for the 1% and 5% PUMS data files. The 1% PUMS has a separate data file for PUMS that cross California state boundary lines. The 5% PUMS has a separate data file for group quarters. ICPSR hierarchical data files (a household unit record followed by a variable number of person records) were run with ICPSR SPSS syntax files to create SPSS data files with one record type, persons. Each record in the transformed SPSS files contains all of the associated household variables for each person. These SPSS files include all of the dictionary information from which they were created and are available to users as Windows SPSS files (.sav). The Windows SPSS files were output to ASCII fixed files. Users can use SSDC to subset variables from these ASCII data files and save the output to a format of their choice.

EXTENT OF COLLECTION: documentation + questionnaires + geographic equivalency files + maps + data definition statements + data files

• CODEBOOKS: PUMS geographic, household and person variables, values and formats are documented in ASCII text or PDF codebook files. Users of these reformatted California data should ignore the variable column locations in these codebooks. Variable column locations in the reformatted files are documented in the SPSS syntax or menu files listed below.

• QUESTIONNAIRES: These PDF files contain the questionnaires used for the 1% and 5% data files.

• GEOGRAPHIC EQUIVALENCY FILES: These ASCII text files are intended to help users understand the relationships between standard Census 1990 geographic concepts (counties, county subdivisions, places, and census tracts) and PUMA geographic units.

• PUMA MAPS: These PDF files contain 1% and 5% PUMA maps.

• SPSS DATA DEFINITION STATEMENT: This text file can read the ASCII data files into statistical analysis software. Users can edit this syntax file to meet their specific requirements. Users are also advised to check the statements to make sure that they are compatible with their software installations, and if they are not, to make the appropriate changes.

• SSDC MENU FILE: This ASCII text file contains variable names and column locations and is used to create the drop down menus for subsetting the ASCII fixed data files.

• DATA FILES: This study has 4 data files that are available in ASCII and SPSS formats. Users can view the file list to get the number of records and the record lengths of the ASCII data files.

RELATED PUBLICATIONS: Publications related to these data files.

BIBLIOGRAPHIC CITATION: U.S. Dept. of Commerce, Bureau of the Census. CENSUS OF POPULATION AND HOUSING, 1990 [CALIFORNIA REFORMATTED DATA]: PUBLIC USE MICRODATA SAMPLE: 1-PERCENT AND 5-PERCENT SAMPLES. [Computer files]. Washington, DC: U.S. Dept. of Commerce, Bureau of the Census [producer], 1995. Ann Arbor, MI: Inter-university Consortium for Political and Social Research. La Jolla, CA: Social Sciences Data Collection [distributors], 2003.