a simpler procedure for treating people who moved between Census Day and the A.C.E. interview;
the development of poststrata for estimation of net coverage errors, by using census results and statistical modeling as appropriate; and
the investigation of possible correlation bias adjustments for additional population groups.
We support the usefulness of demographic analysis for intercensal population estimation and for helping to identify areas of possible enumeration problems in the census and the A.C.E. For this reason, it is important for the Census Bureau to continue its efforts to obtain additional funding for research and development of demographic analysis methods, particularly for estimates of immigrants, and to develop methods for estimating uncertainty in demographic analysis population estimates. Such developmental work needs to be conducted with other federal statistical agencies that have relevant data and that make use of postcensal population estimates.
Recommendation 6.2: The Census Bureau should strengthen its program to improve demographic analysis estimates, in concert with other statistical agencies that use and provide data inputs to the postcensal population estimates. Work should focus especially on improving estimates of net immigration. Attention should also be paid to quantifying and reporting measures of uncertainty for the demographic estimates.
The original A.C.E. data collection, matching, estimation, and initial evaluation were carried out according to carefully specified and controlled procedures with commendable timeliness (see Finding 6.1 in Section 6-A.11). However, the experience with the subsequent evaluations and A.C.E. Revision II demonstrates that the