Data Dictionary: Census 2010
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Survey: Census 2010
Data Source: Census Bureau; Social Explorer
Table: PCT12C. Sex By Age (American Indian And Alaska Native Alone) [209]
Universe: People who are American Indian and Alaska Native alone
Table Details
PCT12C. Sex By Age (American Indian And Alaska Native Alone)
Universe: People who are American Indian and Alaska Native alone
Variable Label
PCT012C001
PCT012C002
PCT012C003
PCT012C004
PCT012C005
PCT012C006
PCT012C007
PCT012C008
PCT012C009
PCT012C010
PCT012C011
PCT012C012
PCT012C013
PCT012C014
PCT012C015
PCT012C016
PCT012C017
PCT012C018
PCT012C019
PCT012C020
PCT012C021
PCT012C022
PCT012C023
PCT012C024
PCT012C025
PCT012C026
PCT012C027
PCT012C028
PCT012C029
PCT012C030
PCT012C031
PCT012C032
PCT012C033
PCT012C034
PCT012C035
PCT012C036
PCT012C037
PCT012C038
PCT012C039
PCT012C040
PCT012C041
PCT012C042
PCT012C043
PCT012C044
PCT012C045
PCT012C046
PCT012C047
PCT012C048
PCT012C049
PCT012C050
PCT012C051
PCT012C052
PCT012C053
PCT012C054
PCT012C055
PCT012C056
PCT012C057
PCT012C058
PCT012C059
PCT012C060
PCT012C061
PCT012C062
PCT012C063
PCT012C064
PCT012C065
PCT012C066
PCT012C067
PCT012C068
PCT012C069
PCT012C070
PCT012C071
PCT012C072
PCT012C073
PCT012C074
PCT012C075
PCT012C076
PCT012C077
PCT012C078
PCT012C079
PCT012C080
PCT012C081
PCT012C082
PCT012C083
PCT012C084
PCT012C085
PCT012C086
PCT012C087
PCT012C088
PCT012C089
PCT012C090
PCT012C091
PCT012C092
PCT012C093
PCT012C094
PCT012C095
PCT012C096
PCT012C097
PCT012C098
PCT012C099
PCT012C100
PCT012C101
PCT012C102
PCT012C103
PCT012C104
PCT012C105
PCT012C106
PCT012C107
PCT012C108
PCT012C109
PCT012C110
PCT012C111
PCT012C112
PCT012C113
PCT012C114
PCT012C115
PCT012C116
PCT012C117
PCT012C118
PCT012C119
PCT012C120
PCT012C121
PCT012C122
PCT012C123
PCT012C124
PCT012C125
PCT012C126
PCT012C127
PCT012C128
PCT012C129
PCT012C130
PCT012C131
PCT012C132
PCT012C133
PCT012C134
PCT012C135
PCT012C136
PCT012C137
PCT012C138
PCT012C139
PCT012C140
PCT012C141
PCT012C142
PCT012C143
PCT012C144
PCT012C145
PCT012C146
PCT012C147
PCT012C148
PCT012C149
PCT012C150
PCT012C151
PCT012C152
PCT012C153
PCT012C154
PCT012C155
PCT012C156
PCT012C157
PCT012C158
PCT012C159
PCT012C160
PCT012C161
PCT012C162
PCT012C163
PCT012C164
PCT012C165
PCT012C166
PCT012C167
PCT012C168
PCT012C169
PCT012C170
PCT012C171
PCT012C172
PCT012C173
PCT012C174
PCT012C175
PCT012C176
PCT012C177
PCT012C178
PCT012C179
PCT012C180
PCT012C181
PCT012C182
PCT012C183
PCT012C184
PCT012C185
PCT012C186
PCT012C187
PCT012C188
PCT012C189
PCT012C190
PCT012C191
PCT012C192
PCT012C193
PCT012C194
PCT012C195
PCT012C196
PCT012C197
PCT012C198
PCT012C199
PCT012C200
PCT012C201
PCT012C202
PCT012C203
PCT012C204
PCT012C205
PCT012C206
PCT012C207
PCT012C208
PCT012C209
Notes:
Source: 2000 SF1 PCT12C.
Relevant Documentation:
Excerpt from: Social Explorer, U.S. Census Bureau; 2010 Census of Population and Housing, Summary File 1: Technical Documentation, Issued June 2011.
 
Sex
Individuals were asked to mark either "male&quot or "female" to indicate their sex. For most cases in which sex was not reported, the appropriate entry was determined from the persons given (i.e., first) name and household relationship. Otherwise, sex was allocated according to the relationship to the householder and the age of the person. (For more information on allocation, see "2010 Census: Operational Overview and Accuracy of the Data.")


Sex Ratio
The sex ratio represents the balance between the male and female populations. Ratios above 100 indicate a larger male population, and ratios below 100 indicate a larger female population. This measure is derived by dividing the total number of males by the total number of females and then multiplying by 100. It is rounded to the nearest tenth.

Comparability
A question on the sex of individuals has been asked of the total population in every census.

Excerpt from: Social Explorer, U.S. Census Bureau; 2010 Census of Population and Housing, Summary File 1: Technical Documentation, Issued June 2011.
 
Age
The data on age were derived from answers to a two-part question (i.e., age and date of birth). The age classification for a person in census tabulations is the age of the person in completed years as of April 1, 2010, the census reference date. Both age and date of birth responses are used in combination to
determine the most accurate age for the person as of the census reference date. Inconsistently reported and missing values are assigned or allocated based on the values of other variables for that person, from other people in the household or from people in other households (i.e., hot-deck imputation).
Age data are tabulated in age groupings and single years of age. Data on age also are used to classify other characteristics in census tabulations.


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 using a linear interpolation method.

Limitation of the data
There is some tendency for respondents to provide their age as of the date they completed the census questionnaire or interview, not their age as of the census reference date. The two-part question and editing procedures have attempted to minimize the effect of this reporting problem on tabulations. Additionally, the current census age question displays the census reference date prominently, and interviewer training emphasizes the importance of collecting age as of the reference date.

Respondents sometimes round a persons age up if they were close to having a birthday. For most single years of age, the misstatements are largely offsetting. The problem is most pronounced at age 0. Also, there may have been more rounding up to age 1 to avoid reporting age as 0 years. (Age in completed months was not collected for infants under age 1.) Editing procedures correct this problem.

There is some respondent resistance to reporting the ages of babies in completed years (i.e., 0 years old when the baby is under 1 year old). Instead, babies ages are sometimes reported in months. The two-part question along with enhanced editing and data capture procedures correct much of this problem before the age data are finalized in tabulations. Additionally, the current census age question includes an instruction for babies ages to be answered as 0 years old when they are under 1 year old.

Age heaping is a common age misreporting error. Age heaping is the tendency for people to overreport ages (or years of birth) that end in certain digits (commonly digits 0 or 5) and underreport ages or years of birth ending in other digits. The two-part question helps minimize the effect of age heaping on the final tabulations.

Age data for centenarians have a history of data quality challenges. The counts in the 1970 and 1980 Censuses for people 100 years and over were substantially overstated. Editing and data collection methods have been enhanced in order to meet the data quality challenges for this population.

It also has been documented that the population aged 69 in the 1970 Census and the population aged 79 in the 1980 Census were overstated. The population aged 89 in 1990 and the population aged 99 in 2000 did not have an overstated count. (For more information on the design of the age question, see the Comparability section below.)

Comparability
Age data have been collected in every census. However, there have been some differences in the way they have been collected and processed over time. In the 2010 Census (as in Census 2000), each individual provided both an age and an exact date of birth. The 1990 Census collected age and year of birth. Prior censuses had collected month and quarter of birth in addition to age and year of birth. The 1990 Census change was made so that coded information could be obtained for both age and year 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 2010 Census: Operational Overview and Accuracy of the Data.)

Excerpt from: Social Explorer, U.S. Census Bureau; 2010 Census of Population and Housing, Summary File 1: Technical Documentation, Issued June 2011.
 
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 maintains tribal affiliation or community attachment. This category includes people who indicate their race as American Indian or Alaska Native or report entries such as Navajo, Blackfeet, Inupiat, Yupik, or Central American Indian groups or South American Indian groups.

Respondents who identified themselves as American Indian or Alaska Native 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, Metlakatla Indian Community and Umatilla) represent reservations or a confederation of tribes on a reservation. The information on tribe is based on self-identification and, therefore, does not reflect any designation of federally or state-recognized tribe. The information for the 2010 Census was derived from the American Indian and Alaska Native Tribal Classification List for Census 2000 and updated from 2002 to 2009 based on the annual Federal Register notice entitled Indian Entities Recognized and Eligible to Receive Services From the United States Bureau of Indian Affairs, Department of the Interior, Bureau of Indian Affairs, issued by OMB, and through consultation with American Indian and Alaska Native communities and leaders.
The American Indian categories shown in Summary Files 1 and 2 represent tribal groupings, which refer to the combining of individual American Indian tribes, such as Fort Sill Apache, Mescalero Apache, and San Carlos Apache, into the general Apache tribal grouping.
The Alaska Native categories shown in Summary Files 1 and 2 represent tribal groupings, which refer to the combining of individual Alaska Native tribes, such as King Salmon Tribe, Native Village of Kanatak, and Sunaq Tribe of Kodiak, into the general Aleut tribal grouping.