Measuring Income and Poverty in Four Surveys: an Overview. Exhibit 3B. Top-Codes, Poverty, Weights and Post-Stratifications

08/09/2008

Exhibit 3B. Top-Codes, Poverty, Weights and Post-Stratifications

 Medical Expenditure PanelNational Health Interview Survey
Earnings Top-CodesWages and salary and self-employment each top-coded at  99th percentile – amount not documented-Top-coded amounts replaced with a “smeared” valueTotal earnings top-coded at $75,000+ bracketValue if top-coded is $75,000+ bracket
Other Income Top-CodesOther income sources top-coded at the 99th percentile-Person totals separately top-coded at 99th percentile-Top-coded amounts replaced with a “smeared” valueFamily income top-coded at $75,000+ bracket-Value when top-coded is $75,000+ bracket, which includes 28% of persons on 2003 (2002 income) file
Poverty Status Family and DatePersons related by blood, marriage or adoption (CPS family)-Alternative NHIS family also calculated December 31 of income reference yearPersons related by blood, marriage or adoption, including foster relationships and unmarried (opposite or same sex) partners (NHIS family)1 to 12 months after income reference year (rolling sample)
Poverty Status in PaperCalendar year poverty status of CPS-type family as of December 31 based on pre-tax money income for 2002-Calendar year poverty status of NHIS-type family as of December 31 based on pre-tax money income for 2002Bracket for 2002 poverty status of NHIS-type family as of interview month based on pre-tax money income for year Brackets on public use file are 25% wide below 200% of poverty and 50% wide from 200 to 500% of poverty
WeightsPerson, family and household weights for December of calendar year and full panelPerson, family and household weights for calendar quarter of interview -- average across quarters is effectively mid-June
UniversesPerson universe restricted to original NHIS sample personsCPS-type family universe excludes part of person universe but includes move-ins related by blood or marriage (meeting CPS family definition)-Broader NHIS-type family universe adds unmarried partner move-ins and others (meeting NHIS family definition) to CPS-type family universeAnyone with person weight has family and household weights – 3 universes the same                                     Some families with household weights are refusals but family weights not adjusted to compensate
Person Control TotalsAge, sex, race/ethnicity, Census Region, and MSA/non-MSA (and income)Age, sex, and race/ethnicity-Weights prior to post-stratification also on file
Family Control TotalsFamily type (spouse present or not), family size, age, sex, and race/ethnicity of reference person, MSA/non-MSA, and region for CPS-type familiesCPS has no family control totals so family counts depend on CPS method of calculating family weights note 2None
Income Control Totals CPS poverty rates for persons in CPS-type families as of December 31 – crossed with demographic control totals when person weights calculatedNone