Type of File:
The Survey of Program Dynamics (SPD) interviewed about 30,125 households from retired 1992 and 1993 SIPP panels, which were scientifically selected on the basis of area of residence to represent the nation as a whole.
The SPD provides estimates of the economic status and activities of the population of the United States. The SPD is designed to provide a large amount of detailed and supplementary data. Such data are made available to meet a wide variety of needs.
Information is available from the survey not only for persons currently in the labor force but also for those who are outside the labor force. The characteristics of such persons - whether married women with or without young children, disabled persons, students, older retired workers, etc., can be determined. Information on their current desire for work, their past work experience, and their intentions for job seeking are also available.
The SPD contains basic demographic
and labor force data, plus additional data on work experience, income,
and noncash benefits.
This file, also known as the SPD Research File, provides monthly labor force data, but in addition, provides supplemental data on work experience, income and noncash benefits. Comprehensive work experience information is given on the employment status, occupation, and industry of persons 15 years old and over. Additional data for persons 15 years old and older are available concerning weeks worked and hours per week worked, reason not working full time, total income and income components. Data on employment and income refer to the preceding year, although demographic data refer to the time of the survey.
This file also contains
data covering nine noncash income sources: food stamps, school lunch
program, employer-provided group health insurance plan, employer-provided
pension plan, personal health insurance, Medicaid, Medicare, CHAMPUS
or military health care, and energy assistance.
This is a Current Population Survey (CPS) hierarchical file structure, not a standard rectangular flat file.
Total 148,521 868 Characters
File Sort Sequence of Sample Units: FIPS state code (GESTFIPS) in its suppressed form.
Survey of Income and Program Participation Users' Guide. The Users' Guide contains a general overview of the file as well as chapters on survey design and content, structure and use of cross-sectional files, linking waves and reliability of the data. A single copy accompanies each technical documentation or tape order. Additional copies are available from Customer Services, Administrative and Customer Services Division, Bureau of the Census, Washington, DC 20233.
Survey of Income and Program Participation Quality Profile. The Quality Profile summarizes the SIPP sample design, sample selection, and data collection procedures. More importantly, the report also summarizes, in convenient form, what is known about the sources and magnitude of errors in estimates from SIPP. Without such summaries, users wanting information about the quality of SIPP estimates would need to search through a large body of literature, some of it not easily accessible. The report covers both sampling and nonsampling error; however, the primary emphasis is on the latter. Copies of this report are available from Customer Services, Administrative and Customer Services Division, Bureau of the Census, Washington, DC 20233.
Additional information on particular subjects can be obtained by contacting an office listed below.
The SPD Bridge file was processed using programs for the March Current Population Survey Demographic Supplement. These data have undergone limited editing and review and should be used carefully.
Interim Calendar Year Files
So that the research community can assess the quality of the SPD sample and make some preliminary assessment of the immediate impact of welfare reform, we are issuing this interim file from the 1997 bridge survey. The interim file is identical to the March CPS in format. It repeats the March CPS content and includes additional information from the SPD. This additional information includes panel weights corresponding to the cohort and the following match keys needed to merge SPD and earlier SIPP data:
SIPP Panel Number SIPP_PNL
Sample Unit Identification Number PP_ID
Entry Address ID PP_ENTRY
Person Number PP_PNUM
A note of caution about this interim file. It will appear to be a cross-section snapshot of the population, like the March CPS. It is important to emphasize that it is not because there has been differential nonresponse over the life of the SIPP and SPD Bridge surveys. Weighting compensates for some of the bias, but may not totally eliminate its effect on estimates. It is simply one segment in the array of longitudinal data being produced for SPD. The weights are longitudinal and only valid to estimate 1996 characteristics of the 1992/1993 SIPP cohorts. Children born since the beginning of the SIPP panel do not receive longitudinal weights in this first file so the distribution of population by age will be skewed toward the older population. However, users can construct an approximate weight for these children by assigning the weights of the mother to each child.
There are several relationship variables on the person record. Only the A_EXPRRP variable has been reviewed and edited. A_EXPRRP is the "edited relationship to reference person." We recommend using A_EXPRRP in your analysis and not using, or using with caution, the following relationship variables:A_FAMREL, A_PFREL, HHDREL, FAMREL, and HHDFMX. These variables will be edited for the forthcoming SPD longitudinal file.