tions of race/ethnicity domains and a different treatment of movers (PES-B for the PES, PES-C for the A.C.E.).

In contrast, five features of the A.C.E. Revision II methodology significantly impaired comparability with the PES (see Mule, 2003:Table 1):

  1. the use in an expanded DSE formula of results from nationwide matching of the E-sample and the census on name and birthdate to estimate duplicate enumerations outside the A.C.E. search area, which reduced the estimated net undercount by 2.8 million people;

  2. the use of Evaluation Follow-Up Study results to reestimate correct enumerations among E-sample cases not linked to census enumerations outside the A.C.E. search area, which reduced the estimated net undercount by 2.4 million people;

  3. the use of results from nationwide matching of the P-sample and the census to estimate deletions from the P-sample for nonmover resident cases that linked to census enumerations outside the A.C.E. search area, which reduced the estimated net undercount by 1.1 million people;

  4. the use of Evaluation Follow-Up and Matching Error Study results to reestimate residents and matches among P-sample cases not linked to census enumerations outside the A.C.E. search area, which increased the estimated net undercount by 0.01 million people; and

  5. the use of sex ratios from demographic analysis for black men age 18 and over and nonblack men age 30 and over to adjust for correlation bias for these groups, which increased the estimated net undercount by 1.7 million people (0.8 million black men and 0.9 million nonblack men).

It would be possible (although probably not feasible) to reestimate the 1990 PES dual-systems estimates to include the fifth item (adjustment for correlation bias) and to use the results of the PES Evaluation Follow-Up Study to adjust the PES for E-sample and P-sample measurement error. However, the lack of a question on month of birth in the 1990 census and the fact that names were captured only for E-sample cases preclude the possibility of nationwide



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