Box 6.1
Alternative Treatment of Duplicate Census Enumerations, Two Examples

  1. Census Household-to-Group Quarters Duplication; Household in E-Sample, not P-Sample: College student is enumerated in group quarters (college dormitory) and by parents at home.

Proper treatment in the A.C.E. when parents’ household is not in the P-sample:

E-sample follow-up of nonmatched household should classify the parents as correct enumerations and the student as an “erroneous enumeration, other residence” (i.e., should have been enumerated at the college location only). In this instance, the A.C.E. would not label the college student as a duplicate because it would not know of the group quarters enumeration; the label would be “other residence,” meaning that the person should have been enumerated at the group quarters. Regardless, the A.C.E. would correctly classify the enumeration as erroneous.

Erroneous treatment:

Household persists in claiming the student in E-sample follow-up, so all three household members are classified as correct (nonmatched) enumerations.

Effect of erroneous treatment on DSE:

Extra “correct” enumeration raises the correct enumeration rate, which (incorrectly) raises the DSE estimate of the population and net under count.

  1. P-Sample Resident Nonmover Household-to-Census Household Duplication Outside A.C.E. Search Area: P-sample household duplicates census enumeration outside its block cluster and ring of surrounding blocks.

Proper treatment in the A.C.E.:

The P-sample interview should have reclassified the household as comprising inmovers (and hence not eligible for estimating the match rate) or dropped it from the sample as having been wrongly assigned to an A.C.E. block cluster.

Erroneous treatment:

The household is retained in the P-sample as a nonmover resident and used to contribute to the numerator as well as the denominator of the match rate depending on whether it matches a census enumeration inside the A.C.E. search area.

Effect of erroneous treatment on the DSE:

Depends on match status of erroneously retained P-sample resident nonmover cases. If predominantly matches, their inclusion (incorrectly) raises the match rate and lowers the DSE estimate of the population and net undercount.

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