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

08/09/2008

Exhibit 1B. Survey Design

 Medical Expenditure Panel SurveyNational Health Interview Survey
Design SummaryLongitudinal panel survey collecting monthly event-level health data and prior calendar year income data through interviews at 6 month intervals, with panels starting annuallyAnnual cross-section household survey collecting prior month and year health data and prior calendar year income data continuously during the year (rolling sample)
UniverseResident civilian noninstitutionalized population of the US (military living with civilian family members excluded but their income included in the income of their civilian family)Resident civilian noninstitutionalized population of the US (military living with civilian family members excluded but their income included in the income of their civilian family)
ExclusionsUnrelated minors (usually under age 18) in households or group quarters if not foster childrenUnrelated minors (usually under age 18) in households or group quarters if not foster children
Sample Size14,700 interviewed families in 2002 (2002 income)Over 36,000 interviewed families in 2003 (2002 income)
Sample DesignSub-sample of persons interviewed by NHIS during previous yearMulti-stage sampling design at the National level with 1/4 of annual sample drawn quarterly
OversamplesBlacks, Hispanics, Asians, and families predicted to have income less than 200% of povertyBlacks and Hispanics
Data CollectionData collected from each household through 5 personal and phone interviews at approximately 6 month intervals in fairly continuous fieldwork-One person per family responds for familyData collected once from each household through personal interviews in continuous fieldwork – 1/52 of sample per week-One person knowledgeable about family health responds for family but any adult present may respond for self
LongitudinalMovers followed to new locations and move-ins interviewed while living with sample persons-Institutionalized not interviewed but data for decedents collected until death 
Response Rates and AttritionInitial response (including frame): 70%Average 2% attrition wave to wave (6 months) after wave 12003 response: 89.2%