Census Day. The adjusted interview day weight was used for inmovers; the adjusted Census Day weight, with a further adjustment for the targeted extended search sampling, was used for nonmovers and outmovers. E-sample weighting was similar but did not require a household noninterview adjustment.⁶

Item imputation was performed separately for each missing characteristic on a P-sample record. The census editing and imputation process provided imputations for missing characteristics on the E-sample records (see Appendix A). Finally, probabilities of being a Census Day resident and of matching the census were assigned to P-sample people with unresolved status, and probabilities of being a correct enumeration were assigned to E-sample people with unresolved enumeration status (see Chapter 6).

Estimation of the DSE for post-strata and the variance associated with the estimates was the final step in the A.C.E. process. The post-strata were specified in advance on the basis of research with 1990 census data (see Griffin and Haines, 2000), and each E-sample and P-sample record was assigned to a post-stratum as applicable. Post-strata that had fewer than 100 cases of nonmovers and outmovers were combined with other post-strata for estimation. In all, the originally defined 448 post-strata, consisting of 64 groups defined by race/ethnicity, housing tenure, and other characteristics cross-classified by 7 age/sex groups (see Figure 6-2 in Chapter 6), were reduced to 416, by combining age/sex groups as needed within one of the other post-strata.

Weighted estimates were prepared for each of the 416 post-strata for the following:

• P-sample total nonmover cases (NON), total outmover cases (OUT), and total inmover cases (IN) (including multiplication of the weights for nonmovers and outmovers by residence status probability, which was 1 for known Census Day residents and 0 for confirmed nonresidents);

• P-sample matched nonmover cases (MNON) and matched outmover cases (MOUT) (including multiplication of the weights by match status probability, which was 1 for known matches and 0 for known nonmatches);

• E-sample total cases (E); and

• E-sample correct enumeration cases (CE) (including multiplication of the weights by correct enumeration status probability).

Also tabulated for each post-stratum was the census count (C) and the count of IIs (people with insufficient information, including people requiring