URL: http://ssdc.ucsd.edu/ssdc/icp06171.html

TITLE: Current Population Surveys: March Individual-Level Extracts, 1968-1992

• STUDYNO = 06171 (Second ICPSR Edition, February 1998)
• INVESTIGATOR = Moffitt, Robert
• DATA SOURCE = Current Population Survey: March Annual Demographic Files, 1968-1992.
• UNIVERSE = Civilian noninstitutionalized population of the United States living in housing units and members of the Armed Forces living in civilian housing units on a military base or in housing units not on a military base.
• SAMPLING = National probability sample of households in the United States.
• DATE-UPDATED-SSDC = June 20, 2006

STUDY DESCRIPTION: The data files in this collection are individual-level extracts derived from the Current Population Survey's March Annual Demographic files for the years 1968 to 1992. Each record contains information about an individual, the household in which the individual resides, and the family and the spouse of the individual. In addition to the standard monthly labor force data, these files contain supplemental data on work experience, migration, income, and noncash income sources such as food stamps, school lunch programs, Medicaid, Medicare, CHAMPUS or military health care, energy assistance, health insurance, and pension plans.

EXTENT OF COLLECTION: documentation + data definition statements + data files

• CODEBOOK: These data are documented by an ASCII text codebook, CURRENT POPULATION SURVEYS: MARCH INDIVIDUAL-LEVEL EXTRACTS, 1968-1992.

• SAS AND SPSS DATA DEFINITION STATEMENTS: These text files can read the ASCII data file into statistical analysis software. Users can edit these syntax files 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.

• DATA FILES: This study has 25 data files.
  • FILE FORMAT = Rectangular ASCII
  • NUMBER OF RECORDS = Varies, see file list
  • RECORD DELIMITER = Line Feed
  • RECORD LENGTH = Varies, see file list (Includes Line Feed Character)

COLLECTION NOTES:

1. Data on employment and income refer to the preceding year while demographic data refer to the time of the survey.
2. These data files may be linked for cross-sectional analyses, with the restriction that the extracts are not completely uniform across the two revisions of the March Current Population Surveys. Three different versions were used during the periods 1968 to 1975, 1976 to 1988, and 1989 to 1992. Merging across versions requires careful attention to how variables were constructed and possible differences in universes for particular variables.
3. With the exception of 1974, the locations of variables in the data files differ between the time periods 1968 through 1988 and 1989 through 1992. Users of data for the years 1968 to 1973 and 1975 to 1988 should use the data definition statements for that time period (Parts 27 and 29). Likewise, users of data for the years 1974 and 1989 to 1992 should select Parts 26 and 28, the data definition statements that pertain to those years.

RESTRICTIONS: All users of these data should acknowledge ICPSR assistance.

RELATED PUBLICATIONS: Publications related to this data file.

BIBLIOGRAPHIC CITATION: Moffitt, Robert. CURRENT POPULATION SURVEYS: MARCH INDIVIDUAL-LEVEL EXTRACTS, 1968-1992 [Computer file]. 2nd ICPSR version. Madison, WI: University of Wisconsin, Institute for Research on Poverty [producer], 1993. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 1998.