Data Dictionary: Census 2000
you are here: choose a survey survey data set table details
Survey: Census 2000
Data Source: U.S. Census Bureau
Table: PCT12K. Sex By Age (AIAN Alone, Not Hispanic Or Latino) [209]
Universe: People who are American Indian and Alaska Native alone, not Hispanic or Latino
Table Details
PCT12K. Sex By Age (AIAN Alone, Not Hispanic Or Latino)
Universe: People who are American Indian and Alaska Native alone, not Hispanic or Latino
Variable Label
PCT012K001
PCT012K002
PCT012K003
PCT012K004
PCT012K005
PCT012K006
PCT012K007
PCT012K008
PCT012K009
PCT012K010
PCT012K011
PCT012K012
PCT012K013
PCT012K014
PCT012K015
PCT012K016
PCT012K017
PCT012K018
PCT012K019
PCT012K020
PCT012K021
PCT012K022
PCT012K023
PCT012K024
PCT012K025
PCT012K026
PCT012K027
PCT012K028
PCT012K029
PCT012K030
PCT012K031
PCT012K032
PCT012K033
PCT012K034
PCT012K035
PCT012K036
PCT012K037
PCT012K038
PCT012K039
PCT012K040
PCT012K041
PCT012K042
PCT012K043
PCT012K044
PCT012K045
PCT012K046
PCT012K047
PCT012K048
PCT012K049
PCT012K050
PCT012K051
PCT012K052
PCT012K053
PCT012K054
PCT012K055
PCT012K056
PCT012K057
PCT012K058
PCT012K059
PCT012K060
PCT012K061
PCT012K062
PCT012K063
PCT012K064
PCT012K065
PCT012K066
PCT012K067
PCT012K068
PCT012K069
PCT012K070
PCT012K071
PCT012K072
PCT012K073
PCT012K074
PCT012K075
PCT012K076
PCT012K077
PCT012K078
PCT012K079
PCT012K080
PCT012K081
PCT012K082
PCT012K083
PCT012K084
PCT012K085
PCT012K086
PCT012K087
PCT012K088
PCT012K089
PCT012K090
PCT012K091
PCT012K092
PCT012K093
PCT012K094
PCT012K095
PCT012K096
PCT012K097
PCT012K098
PCT012K099
PCT012K100
PCT012K101
PCT012K102
PCT012K103
PCT012K104
PCT012K105
PCT012K106
PCT012K107
PCT012K108
PCT012K109
PCT012K110
PCT012K111
PCT012K112
PCT012K113
PCT012K114
PCT012K115
PCT012K116
PCT012K117
PCT012K118
PCT012K119
PCT012K120
PCT012K121
PCT012K122
PCT012K123
PCT012K124
PCT012K125
PCT012K126
PCT012K127
PCT012K128
PCT012K129
PCT012K130
PCT012K131
PCT012K132
PCT012K133
PCT012K134
PCT012K135
PCT012K136
PCT012K137
PCT012K138
PCT012K139
PCT012K140
PCT012K141
PCT012K142
PCT012K143
PCT012K144
PCT012K145
PCT012K146
PCT012K147
PCT012K148
PCT012K149
PCT012K150
PCT012K151
PCT012K152
PCT012K153
PCT012K154
PCT012K155
PCT012K156
PCT012K157
PCT012K158
PCT012K159
PCT012K160
PCT012K161
PCT012K162
PCT012K163
PCT012K164
PCT012K165
PCT012K166
PCT012K167
PCT012K168
PCT012K169
PCT012K170
PCT012K171
PCT012K172
PCT012K173
PCT012K174
PCT012K175
PCT012K176
PCT012K177
PCT012K178
PCT012K179
PCT012K180
PCT012K181
PCT012K182
PCT012K183
PCT012K184
PCT012K185
PCT012K186
PCT012K187
PCT012K188
PCT012K189
PCT012K190
PCT012K191
PCT012K192
PCT012K193
PCT012K194
PCT012K195
PCT012K196
PCT012K197
PCT012K198
PCT012K199
PCT012K200
PCT012K201
PCT012K202
PCT012K203
PCT012K204
PCT012K205
PCT012K206
PCT012K207
PCT012K208
PCT012K209
Relevant Documentation:
Excerpt from: Social Explorer, U.S. Census Bureau; 2000 Census of Population and Housing, Summary File 1: Technical Documentation, 2001.
 
Sex
The data on sex were derived from answers to a question that was asked of all people. Individuals were asked to mark either "male" or "female" to indicate their sex. For most cases in which sex was not reported, it was determined by the appropriate entry from the persons given (i.e., first) name and household relationship. Otherwise, sex was imputed according to the relationship to the householder and the age of the person. (For more information on imputation, see "Accuracy of the Data.")

Sex ratio
A measure derived by dividing the total number of males by the total number of females and multiplying by 100.

Comparability
A question on the sex of individuals has been asked of the total population in every census.
For more information on sex, please telephone 301-457-2378.

Excerpt from: Social Explorer, U.S. Census Bureau; 2000 Census of Population and Housing, Summary File 1: Technical Documentation, 2001.
 
Age
The data on age were derived from answers to a question that was asked of all people. The age classification is based on the age of the person in complete years as of April 1, 2000. The age of the person was usually 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.

Median age
This measure divides the age distribution into two equal parts: one-half of the cases falling below the median value and one-half above the value. Median age is computed on the basis of a single year of age distribution.

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 five. 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 aged 69 in 1970 and aged 79 in 1980. Improvements have been made since then in the questionnaire design, and in the allocation procedures which have further minimized these problems. The count of people aged 89 in the 1990 census was not overstated.

Review of detailed 1990 census information indicated that respondents tended to provide their age as of the date they completed 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 one 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 one 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 one to avoid reporting age as zero years. (Age in complete months was not collected for infants under age one.)

The reporting of age one 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.")
For more information on age, please telephone 301-457-2428.

Excerpt from: Social Explorer, U.S. Census Bureau; 2000 Census of Population and Housing, Summary File 1: Technical Documentation, 2001.
 
American Indian or Alaska Native
A person having origins in any of the original peoples of North and South America (including Central America) and who maintain tribal affiliation or community attachment. It includes people who classified themselves as described below.

American Indian
Includes people who indicated their race as "American Indian," entered the name of an Indian tribe, or reported such entries as Canadian Indian, French American Indian, or Spanish-American Indian.

American Indian tribe
Respondents who identified themselves as American Indian were asked to report their enrolled or principal tribe. Therefore, tribal data in tabulations reflect the written entries reported on the questionnaires. Some of the entries (for example, Iroquois, Sioux, Colorado River, and Flathead) represent nations or reservations. The information on tribe is based on self identification and therefore does not reflect any designation of federally or state-recognized tribe. Information on American Indian tribes is presented in summary files. The information for Census 2000 is derived from the American Indian Tribal Classification List for the 1990 census that was updated based on a December 1997 Federal Register Notice, entitled "Indian Entities Recognized and Eligible to Receive Service From the United States Bureau of Indian Affairs," Department of the Interior, Bureau of Indian Affairs, issued by the Office of Management and Budget.

Alaska Native
Includes written responses of Eskimos, Aleuts, and Alaska Indians as well as entries such as Arctic Slope, Inupiat, Yupik, Alutiiq, Egegik, and Pribilovian. The Alaska tribes are the Alaskan Athabascan, Tlingit, and Haida. The information for Census 2000 is based on the American Indian Tribal Classification List for the 1990 census, which was expanded to list the individual Alaska Native Villages when provided as a written response for race.

Excerpt from: Social Explorer, U.S. Census Bureau; 2000 Census of Population and Housing, Summary File 1: Technical Documentation, 2001.
 
Hispanic or Latino
The data on the Hispanic or Latino population were derived from answers to a question that was asked of all people. The terms "Spanish,""Hispanic origin," and "Latino" are used interchangeably. Some respondents identify with all three terms while others may identify with only one of these three specific terms. Hispanics or Latinos who identify with the terms "Spanish,"" Hispanic," or "Latino" are those who classify themselves in one of the specific Spanish, Hispanic, or Latino categories listed on the questionnaire ("Mexican,""Puerto Rican," or "Cuban") as well as those who indicate that they are "other Spanish/Hispanic/Latino." People who do not identify with one of the specific origins listed on the questionnaire but indicate that they are "other Spanish, Hispanic, or Latino" are those whose origins are from Spain, the Spanish-speaking countries of Central or South America, the Dominican Republic, or people identifying themselves generally as Spanish, Spanish-American, Hispanic, Hispano, Latino, and so on. All write-in responses to the "other Spanish/Hispanic/Latino" category were coded.

Origin can be viewed as the heritage, nationality group, lineage, or country of birth of the person or the persons parents or ancestors before their arrival in the United States. People who identify their origin as Spanish, Hispanic, or Latino may be of any race. Some tabulations are shown by the origin of the householder. In all cases where the origin of households, families, or occupied housing units is classified as Spanish, Hispanic, or Latino, the origin of the householder is used. (See the discussion of householder under "Household Type and Relationship.")

If an individual could not provide a Hispanic origin response, their origin was assigned using specific rules of precedence of household relationship. For example, if origin was missing for a natural-born daughter in the household, then either the origin of the householder, another naturalborn child, or spouse of the householder was assigned. If Hispanic origin was not reported for anyone in the household, the Hispanic origin of a householder in a previously processed household with the same race was assigned. This procedure is a variation of the general imputation procedures described in "Accuracy of the Data" and is similar to those used in 1990, except for Census 2000 race and Spanish surnames were used to assist in assigning an origin (see the "Comparability" section below also).

Comparability
There are two important changes to the Hispanic origin question for Census 2000. First, the sequence of the race and Hispanic origin questions for Census 2000 differs from that in 1990; in 1990, the race question preceded the Hispanic origin question. Testing prior to Census 2000 indicated that response to the Hispanic origin question could be improved by placing it before the race question without affecting the response to the race question. Second, there is an instruction preceding the Hispanic origin question indicating that respondents should answer both the Hispanic origin and the race questions. This instruction was added to give emphasis to the distinct concepts of the Hispanic origin and race questions, and to emphasize the need for both pieces of information.

Furthermore, there has been a change in the processing of the Hispanic origin and race responses. In the 1990 census, respondents provided Hispanic origin responses in the race question and race responses in the Hispanic origin question. In 1990, the Hispanic origin question and the race question had separate edits; therefore, although information may have been present on the questionnaire, it was not fully utilized due to the discrete nature of the edits. However, for Census 2000 there is a joint race and Hispanic origin edit, which can utilize Hispanic origin and race information that was reported in the inappropriate question.
For more information on Hispanic or Latino, please telephone 301-457-2403.