a minimum of 1,800 housing units from about 60 medium and large block clusters per state (3,000 block clusters of the 10,000), with the remainder allocated proportionate to state population size. Also, Hawaii is allocated a minimum of 4,500 housing units in the CCM sample (roughly 150 block clusters), and 10,000 housing units (roughly 330 block clusters) are selected of American Indians living on reservations, which are allocated proportionally to the number of American Indians living on reservations in each state.

Once the 10,000 block clusters for the CCM are identified, they will be independently listed to determine how many housing units are actually present (since the MAF does not provide a perfect count and also because the MAF will be slightly dated). In particular, for small block clusters, this independent listing will find many of them to have more than two housing units. If the number of housing units for small block clusters is found to be more than 10, current plans are to choose those block clusters into the CCM sample with certainty. Otherwise, the remaining small block clusters will be subsampled. (Plans are to subsample small block clusters with between none and two housing units at the rate of 0.1, those with between three and five housing at the rate of 0.25, and those with between six and nine housing units at the rate of 0.45.)

Finally, regarding substate allocations of block clusters, while plans are currently not final, the Census Bureau is likely to include some modest degree of oversampling of block clusters in areas that have a large fraction of people that rent their residences and possibly in areas that have a large fraction of minority residents.

The general argument in support of the state allocations for the 2010 CCM PES is that they mimic those for 2000, since the Census Bureau was generally satisfied with the 2000 design of the Accuracy and Coverage Evaluation (A.C.E.) Program in terms of the variance of estimates of net undercoverage for poststrata. (The Census Bureau has no specific variance requirements for the 2010 CCM estimates, because production of adjusted counts is not anticipated.) With respect to substate allocations, the Census Bureau is concerned with increased variances and so intends to refrain from more than a modest amount of oversampling.

The Census Bureau examined some alternative specifications for the design of the CCM PES to see if they might have advantages, using simulation studies of both the quality of the resulting net coverage error estimates and the quality of estimates of the number of omissions and erroneous enumerations at the national level and for 64 poststrata (for details, see Fenstermaker, 2005, 2006). Initially, four designs were examined: (1) the design described above—i.e., allocations proportional to total state population, with a minimum of 60 block clusters per state, with Hawaii allocated at least 150 block clusters; (2) as (1) except with



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