Data Quality Wednesday, Sept 3

2000 Census Short Form Long Form (15% sample) Changes –Marriage (short to long form) –Race/Ethnicity (wording & order)

Measuring Coverage Demographic Analysis –Macro level approach –Comparing aggregate sets of data Data independent of the census Dual System Estimation (A.C.E.) –Capture/recapture –Based on independent sample survey 11,800 block clusters/314,000 housing units –Provides coverage correction factors Post-strata & inclusion probabilities=estimate of true population

Demographic Analysis (DA) Uses balancing equation of population change P 2 = P 1 + B – D + I – E Age by age, but uses Medicare data for ages 65 and older Vital registration, adjusted for under- registration Administrative records Immigration & Naturalization records Estimated

Census 2000 Coverage What do DA estimates in Table 2 show? What may be responsible? (Fig 1) What is error of closure? What do results in Table 3 suggest? What do results in Table 4 suggest? How were findings used to revise the DA analysis? (Tab 5 & Fig 2)

Census Politics Differential undercount –Who gets missed? Why? Sampling Cost Questions asked