Data Quality

1. Data Quality Wednesday, Sept 3

2. 2000 Census • Short Form • Long Form (15% sample) • Changes • Marriage (short to long form) • Race/Ethnicity (wording & order)

3. http://www.census.gov/prod/2001pubs/c2kbr01-1.pdf

4. 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

5. Demographic Analysis (DA) • Uses balancing equation of population change P2 = P1 + B – D + I – E • Age by age, but uses Medicare data for ages 65 and older Administrative records Estimated Vital registration, adjusted for under-registration Immigration & Naturalization records

6. 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)

7. Census Politics • Differential undercount • Who gets missed? Why? • Sampling • Cost • Questions asked