Data Dictionary: Census 2000
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Survey: Census 2000
Data Source: U.S. Census Bureau
Table: PCT72A. Age Of Householder By Household Income In 1999 Dollars (White Alone Householder) [120]
Universe: Households with a householder who is White alone
Table Details
PCT72A. Age Of Householder By Household Income In 1999 Dollars (White Alone Householder)
Universe: Households with a householder who is White alone
Variable Label
PCT072A001
PCT072A002
PCT072A003
PCT072A004
PCT072A005
PCT072A006
PCT072A007
PCT072A008
PCT072A009
PCT072A010
PCT072A011
PCT072A012
PCT072A013
PCT072A014
PCT072A015
PCT072A016
PCT072A017
PCT072A018
PCT072A019
PCT072A020
PCT072A021
PCT072A022
PCT072A023
PCT072A024
PCT072A025
PCT072A026
PCT072A027
PCT072A028
PCT072A029
PCT072A030
PCT072A031
PCT072A032
PCT072A033
PCT072A034
PCT072A035
PCT072A036
PCT072A037
PCT072A038
PCT072A039
PCT072A040
PCT072A041
PCT072A042
PCT072A043
PCT072A044
PCT072A045
PCT072A046
PCT072A047
PCT072A048
PCT072A049
PCT072A050
PCT072A051
PCT072A052
PCT072A053
PCT072A054
PCT072A055
PCT072A056
PCT072A057
PCT072A058
PCT072A059
PCT072A060
PCT072A061
PCT072A062
PCT072A063
PCT072A064
PCT072A065
PCT072A066
PCT072A067
PCT072A068
PCT072A069
PCT072A070
PCT072A071
PCT072A072
PCT072A073
PCT072A074
PCT072A075
PCT072A076
PCT072A077
PCT072A078
PCT072A079
PCT072A080
PCT072A081
PCT072A082
PCT072A083
PCT072A084
PCT072A085
PCT072A086
PCT072A087
PCT072A088
PCT072A089
PCT072A090
PCT072A091
PCT072A092
PCT072A093
PCT072A094
PCT072A095
PCT072A096
PCT072A097
PCT072A098
PCT072A099
PCT072A100
PCT072A101
PCT072A102
PCT072A103
PCT072A104
PCT072A105
PCT072A106
PCT072A107
PCT072A108
PCT072A109
PCT072A110
PCT072A111
PCT072A112
PCT072A113
PCT072A114
PCT072A115
PCT072A116
PCT072A117
PCT072A118
PCT072A119
PCT072A120
Relevant Documentation:
Excerpt from: Social Explorer, U.S. Census Bureau; 2000 Census of Population and Housing, Summary File 3: Technical Documentation, 2002.
 
Age
The data on age, which was asked of all people, were derived from answers to the long-form questionnaire Item 4 and short-form questionnaire Item 6. The age classification is based on the age of the person in complete years as of April 1, 2000. The age of the person usually was derived from their date of birth information. Their reported age was used only when date of birth information was unavailable.

Data on age are used to determine the applicability of some of the sample questions for a person and to classify other characteristics in census tabulations. Age data are needed to interpret most social and economic characteristics used to plan and examine many programs and policies. Therefore, age is tabulated by single years of age and by many different groupings, such as 5-year age groups.

Median age
Median age divides the age distribution into two equal parts: one-half of the cases falling below the median age and one-half above the median. Median age is computed on the basis of a single year of age standard distribution (see the "Standard Distributions" section under "Derived Measures"). Median age is rounded to the nearest tenth. (For more information on medians, see "Derived Measures".)

Limitation of the data
The most general limitation for many decades has been the tendency of people to overreport ages or years of birth that end in zero or 5. This phenomenon is called "age heaping." In addition, the counts in the 1970 and 1980 censuses for people 100 years old and over were substantially overstated. So also were the counts of people 69 years old in 1970 and 79 years old in 1980. Improvements have been made since then in the questionnaire design and in the imputation procedures that have minimized these problems.

Review of detailed 1990 census information indicated that respondents tended to provide their age as of the date of completion of the questionnaire, not their age as of April 1, 1990. One reason this happened was that respondents were not specifically instructed to provide their age as of April 1, 1990. Another reason was that data collection efforts continued well past the census date. In addition, there may have been a tendency for respondents to round their age up if they were close to having a birthday. It is likely that approximately 10 percent of people in most age groups were actually 1 year younger. For most single years of age, the misstatements were largely offsetting. The problem is most pronounced at age zero because people lost to age 1 probably were not fully offset by the inclusion of babies born after April 1, 1990. Also, there may have been more rounding up to age 1 to avoid reporting age as zero years. (Age in complete months was not collected for infants under age 1.)

The reporting of age 1 year older than true age on April 1, 1990, is likely to have been greater in areas where the census data were collected later in calendar year 1990. The magnitude of this problem was much less in the 1960, 1970, and 1980 censuses where age was typically derived from respondent data on year of birth and quarter of birth.

These shortcomings were minimized in Census 2000 because age was usually calculated from exact date of birth and because respondents were specifically asked to provide their age as of April 1, 2000. (For more information on the design of the age question, see the section below that discusses "Comparability.")

Comparability
Age data have been collected in every census. For the first time since 1950, the 1990 data were not available by quarter year of age. This change was made so that coded information could be obtained for both age and year of birth. In 2000, each individual has both an age and an exact date of birth. In each census since 1940, the age of a person was assigned when it was not reported. In censuses before 1940, with the exception of 1880, people of unknown age were shown as a separate category. Since 1960, assignment of unknown age has been performed by a general procedure described as "imputation." The specific procedures for imputing age have been different in each census. (For more information on imputation, see "Accuracy of the Data.")

Excerpt from: Social Explorer, U.S. Census Bureau; 2000 Census of Population and Housing, Summary File 3: Technical Documentation, 2002.
 
Householder
The data on relationship to householder were derived from the question, "How is this person related to Person 1," which was asked of Persons 2 and higher in housing units. One person in each household is designated as the householder (Person 1). In most cases, the householder is the person, or one of the people, in whose name the home is owned, being bought, or rented. If there is no such person in the household, any adult household member 15 years old and over could be designated as the householder (i.e., Person 1). Households are classified by type according to the sex of the householder and the presence of relatives. Two types of householders are distinguished: family householders and nonfamily householders. A family householder is a householder living with one or more individuals related to him or her by birth, marriage, or adoption. The householder and all of the people in the household related to him or her are family members. A nonfamily householder is a householder living alone or with nonrelatives only.

Excerpt from: Social Explorer, U.S. Census Bureau; 2000 Census of Population and Housing, Summary File 3: Technical Documentation, 2002.
 
Income of households
This includes the income of the householder and all other individuals 15 years old and over in the household, whether they are related to the householder or not. Because many households consist of only one person, average household income is usually less than average family income. Although the household income statistics cover calendar year 1999, the characteristics of individuals and the composition of households refer to the time of enumeration (April 1, 2000). Thus, the income of the household does not include amounts received by individuals who were members of the household during all or part of calendar year 1999 if these individuals no longer resided in the household at the time of enumeration. Similarly, income amounts reported by individuals who did not reside in the household during 1999 but who were members of the household at the time of enumeration are included. However, the composition of most households was the same during 1999 as at the time of enumeration.

Excerpt from: Social Explorer, U.S. Census Bureau; 2000 Census of Population and Housing, Summary File 3: Technical Documentation, 2002.
 
White
A person having origins in any of the original peoples of Europe, the Middle East, or North Africa. It includes people who indicate their race as "White" or report entries such as Irish, German, Italian, Lebanese, Near Easterner, Arab, or Polish.