Program was designed and executed to produce the underlying input data. We consider below 10 aspects of the original A.C.E. followed by a summary of findings in Section 6-A.11:

  1. basic design;

  2. conduct and timing;

  3. definition of the P-sample—treatment of movers;

  4. definition of the E-sample—exclusion of “insufficient information” cases;

  5. household noninterviews in the P-sample;

  6. imputation for missing data in the P-sample and E-sample;

  7. accuracy of household residence information in the P-sample and E-sample;

  8. quality of matching;

  9. targeted extended search; and

  10. poststratification.

6–A.1 Basic Design

The design of the 2000 A.C.E. was similar to the 1990 Post-Enumeration Survey (PES). The goal of each program was to provide a basis for estimating two key components of the dual-systems estimation (DSE) formula for measuring net undercount or overcount in the census (see Section 5-A). They are:

  1. the match rate, or the rate at which members of independently surveyed households in a sample of block clusters (the P-sample) matched to census enumerations, calculated separately for population groups (poststrata) and weighted to population totals, and

  2. the correct enumeration rate, or the rate at which census enumerations in the sampled block clusters (the E-sample) were correctly included in the census (including both matched cases and nonmatched correct enumerations), calculated separately for poststrata and weighted to population totals.1


The E-sample by design excluded some census cases in the A.C.E. block clusters (see Appendix E.1.e and E.3).

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