Measuring Income and Poverty in Four Surveys: an Overview. Exhibit 1A. Survey Design

08/09/2008

Exhibit 1A. Survey Design

 Current Population SurveySurvey of Income and Program Participation
Design SummaryAnnual cross-section household survey at fixed point in time collecting detailed prior calendar year income and current labor force and demographic dataLongitudinal panel survey collecting detailed monthly income and a broad range of other data through interviews at 4 month intervals, with most recent panels started in 2001 and 2004
UniverseResident civilian noninstitutionalized population of the US plus military living with civilian family members on or off baseResident civilian noninstitutionalized population of the US plus military living with civilian family members on or off base
ExclusionsUnrelated children under 15 in group quarters e.g. sheltersUnrelated children under 15 in group quarters e.g. shelters
Sample Size78,300 interviewed households in 2003 (2002 income)28,000 interviewed households in 2001 panel (post-reduction)
Sample DesignMulti-stage sampling design at the State level with sub-State samples in NY and CAMulti-stage sampling design at the National level with sample drawn at beginning of each new panel
OversamplesHispanics, non-Whites, and Whites with children under 19Low income areas
Data CollectionData collected once from each household through personal and phone interviews February through April, with bulk of data collection in March (2002 forward)One person per household responds for householdData collected from each household through 9 personal and phone interviews at 4 month intervals (2001 panel) -- rotation groups provide continuous fieldworkEach person 15 or over responds for self
Longitudinal          Movers followed to new locations and move-ins interviewed while living with sample personsInstitutionalized not interviewed and data for decedents is last interview outside an institution before death
Response Rates and Attrition2003 Supplement month response to CPS-1 (underlying monthly survey): 92.2% – supplement data is imputed for CPS-1 responders who refuse supplement2001 panel initial response: 87.7%Average 6.5% attrition wave to wave (4 months) after wave 2