The 2000 Census Interim Assessment (2001) / Chapter Skim
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8. Imputations and Late Additions
8. Imputations and Late Additions
Pages 131-154
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From page 131... ...
The total number of lIs in 2000 was about 8.2 million people, 2.9 percent of the household population (excluding a small number of people reinstated in the census who also required imputation) ; the corresponding number in 1990 was about 2.2 million, 0.9 percent of the population.
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From page 132... ...
and the 1990 PES led us to expect similar rates of net undercount for key population groups because of similarities in the estimates for each of two components of the DSE formula, namely, the match rate estimated from the P-sample and the correct enumeration rate estimated from the E-sample (see Tables 7-8 and 7-9 in Chapter 71.
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From page 134... ...
Owner 1.24 0.71 1.93 0.46 Renter 2.38 1.12 3.47 1.44 Total Owner 1.66 0.75 2.39 0.56 Total Renter 3.08 1.05 4.10 1.55 Panel B Age/Sex Group Children Under Age 18 3.11 0.92 4.00 0.82 Men Aged 18-29 2.86 0.82 3.65 1.45 Women Aged 18-29 2.56 1.03 3.46 1.45 Men Aged 30-49 1.77 0.79 2.53 0.76 Women Aged 30-49 1.58 0.81 2.37 0.70 Men Aged 50 and Over 1.25 0.81 2.04 0.69 Women Aged 50 and Over 1.30 0.80 2.08 0.79 Total 2.11 0.85 2.93 0.90 NOTE: The 2000 total with insufficient information is the unduplicated sum of people requiring imputation and late additions to the census; 1990 figures include small number of late additions to the census from coverage improvement operations. a Data exclude American Indians living on reservations; the Asian (Non-Hispanic)
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From page 135... ...
Thus, the increased percentages of people with insufficient information in the census largely appear to explain the reduction in measured net undercount from 2000 to 1990 for historically less well-counted groups. In particular, the increased percentages of people requiring imputation as distinct from people reinstated too late for A.C.E.
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From page 136... ...
. Cd3 c o O c, cat < c o of e4 ~ Non-Hispanic White O Non-Hispanic Black · Hispanic Is 3' x ~~ ~~ ~^ e i ~~ g ~~ u.~ 1 1 1 1 1 1 1 1 Under 18 18-29 30~9 50+ Both M/F Male Female Both M/F Male 18-29 30 49 50+ Under 18 18-29 30~9 50+ 1~29 3W9 50+ Female FIGURE 8-2 Late additions to the census by race/ethnicity domain, housing tenure, and age/sex groups.
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From page 137... ...
. Role of IIs in the Census and the DSE There are two important points about people with insufficient information, whether they are people requiring imputation or people reinstated in the census too late for A.C.E.
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From page 138... ...
The correction ratio is considerably higher than the coverage correction factor for A.C.E. Also, estimates of duplicates and other kinds of erroneous enumerations are lower than they would otherwise be because so many more census records are excluded from A.C.E.
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From page 139... ...
Individual persons requiring imputation comprised 0.9 percent of the total household population in 2000, 2.33 million people (Schindler, 2001) , compared with 0.2 percent of the total population in 1990, 373,000 people (including some imputations for persons in group quarters; Love and Dalzell, 2001~.
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From page 140... ...
American Indians and Alaska Natives on reservations also have the highest total proportion of people requiring imputation of any race/ethnicity group (5%~. 4Mail return rates in 2000 were about 77 percent for owners and 57 percent for renters (from tabulations by panel staff of U.S.
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From page 141... ...
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From page 142... ...
The percentage varied from 1 percent in Iowa and Nebraska to 3.74 percent in the District of Columbia. States with the highest proportions of people requiring imputation included a group in the Southwest: Arizona, California, Nevada, New Mexico, and Texas, plus
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From page 143... ...
Delaware, Maryland, and New York had the highest rates of people requiring whole household imputation, and Maine, Nebraska, North and South Dakota, and West Virginia had the lowest rates (Figure 8-59. Proportions of people requiring housing status imputation are the lowest and the most evenly distributed across states (Figure 8-6~.
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From page 144... ...
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From page 145... ...
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From page 146... ...
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From page 148... ...
There is probably more variation in percentages of people reinstated in the census at smaller levels of geographic aggregation than at the state level. The Census Bureau indicated that the decision to reinstate people who were originally identified as duplicates was most often made in rural areas with nonstandard addressing styles and in apartment buildings in cities, for which individual apartment addresses were not clear (Miskura, 2000b)
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From page 150... ...
Moreover, adjustment of the census counts in the presence of substantial local variations could be problematic: a disproportionately well-counted area would receive an adjustment that is likely too great and the reverse would be true for a disproportionately less well-counted area. Further research is needed on geographic variations in the completeness of the census due not only to people reinstated in the census, but also to people requiring imputation.
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From page 151... ...
contained duplicates, and there were many more such cases in 2000 than in 1990. Also, if the special operation to unduplicate addresses in the MAP had not permanently deleted 3.6 million people of the 6 million originally set aside for examination, then the A.C.E.
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From page 152... ...
of people requiring imputation and people reinstated in the census did not likely affect the DSE to any appreciable degree (as explained in Hogan, 2001b; see also Box 8-11. We find that the larger numbers of imputed and reinstated people lead mathematically to a reduction in the overall net undercount rate; specifically, the larger numbers of people requiring imputation contributed to reducing net undercount rates for historically less well-counted groups.
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From page 153... ...
. However, the 1970 case was different in that most of the housing status imputations involved sample-based imputation of occupancy status to housing units that were originally classified as vacant in nonresponse follow-up.
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From page 154... ...
. Although it may result that the housing status imputations in the 2000 census appear reasonable, it is clearly desirable to minimize the number of census enumerations for which so little is known.
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