DOI: 10.3886/icpsr04470.v1
title: Survey of Program Dynamics (SPD) Third Longitudinal File: Data Years 1992, 1993, 1994, 1996, 1997, 1998, 1999, 2000, and 2001
title: Version 1

description: The Survey of Program Dynamics (SPD) Third Longitudinal
File is a fully edited file that provides socioeconomic data for the
calendar years 1992-2001, except 1995. It is intended for longitudinal
analyses of effects of welfare reform on individuals, families, and
households. The file can be linked to the Survey of Program Dynamics
(SPD) First Longitudinal File (ICPSR 3315), SPD Second Longitudinal
File (ICPSR 3594), SPD 1997 Bridge (ICPSR 2797), SPD 1998 (ICPSR
2917), and the SIPP panel files for 1992 (ICPSR 6429) and 1993 (ICPSR
6886). The subject matter is described as follows: demographic data
(age, sex, ethnic origin, marital status, household relationship,
education, and veteran status), economic data (work experience,
employment status, occupation, industry, weeks worked and hours per
week worked, total income, and income components for people 15 years
and older), income data (income from jobs, net income from business,
farm or rent, pensions, dividends, interest, and Social Security
payments), and data covering noncash income sources (food stamps,
school lunch program, employer-provided group health insurance plan,
employer-provided pension plans, Medicaid, Medicare, CHAMPUS or
military health care, and energy assistance). The file contains codes
for 41 individual states, plus the District of Columbia. The SPD
sample in the nine remaining states is identified in three groups for
confidentiality reasons: (1) Maine and Vermont, (2) Iowa, North
Dakota, and South Dakota, and (3) Alaska, Idaho, Montana, and
Wyoming. The sample is not designed to produce state estimates.
description: The SURVEY OF PROGRAM DYNAMICS (SPD), 1997: BRIDGE SURVEY
 (ICPSR 2797) interviewed approximately 29,619 households from retired
 1992 and 1993 Survey in Income and Program Participation (SIPP)
 panels, which were scientifically selected on the basis of area of
 residence to represent the nation as a whole. For the SPD 1998 (ICPSR
 2917), from the households interviewed in 1997, a subsample of 19,129
 households was selected for the continuing sample. Low-income
 households and households with children were selected with certainty
 or near certainty. Middle- and high-income households without children
had a 1-in-4 chance of being selected for the sample.
description: Datasets: 
DS1: Survey of Program Dynamics (SPD) Third Longitudinal File: Data Years 1992, 1993, 1994, 1996, 1997, 1998, 1999, 2000, and 2001
description: The universe consists of people who resided in the United
States, except people living in institutions, such as prisons and
nursing homes or entire military households, in March 1992 and/or
March 1993. The universe is represented by original sample persons
from the 1992 and 1993 Survey of Income and Program Participation
(SIPP) panels, except those who were subsampled out because of cost
constraints or leaving the universe before the 1998 interview.
description: A note of caution about this file. The weights on this
file are longitudinal, therefore, they are only valid for estimates of
the characteristics of the cohorts of people who were represented by
the original sample persons from the SIPP 1992 and 1993 panels. An
original sample person is a sample person who was a self or proxy
respondent in Wave 1 of the SIPP 1992 or 1993 panel. Children born
since the beginning of the SIPP panel to original sample persons also
receive longitudinal weights. The original sample has undergone a
substantial amount of attrition from 1992 (or 1993) through 2002. As a
result, estimates from this file are not as representative of the
United States population as a cross-sectional survey would be.
Therefore, results should be viewed with caution. In addition, it
should be noted that this file is based on seven different survey
collection vehicles: the 1992/93 SIPP instruments that were used to
produce data for 1992, 1993, and 1994, a 1-7 modified March CPS
instrument that was used to collect data for calendar year 1996, the
1998 SPD instrument that was used to collect data for calendar year
1997, the 1999 SPD instrument that was used to collect data for
calendar year 1998, the 2000 SPD instrument that was used to collect
data for calendar year 1999, the 2001 SPD instrument that was used to
collect data for calendar year 2000 and the 2002 SPD instrument that
was used to collect data for calendar year 2001. Therefore, changes
that are noted over time could be the result of the different survey
instruments used to produce the estimates.