Data Dictionary: Census 2000
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Survey: Census 2000
Data Source: U.S. Census Bureau
Table: PCT12A. Sex By Age (White Alone) [209]
Universe: People who are White alone
Table Details
PCT12A. Sex By Age (White Alone)
Universe: People who are White alone
Variable Label
PCT012A001
PCT012A002
PCT012A003
PCT012A004
PCT012A005
PCT012A006
PCT012A007
PCT012A008
PCT012A009
PCT012A010
PCT012A011
PCT012A012
PCT012A013
PCT012A014
PCT012A015
PCT012A016
PCT012A017
PCT012A018
PCT012A019
PCT012A020
PCT012A021
PCT012A022
PCT012A023
PCT012A024
PCT012A025
PCT012A026
PCT012A027
PCT012A028
PCT012A029
PCT012A030
PCT012A031
PCT012A032
PCT012A033
PCT012A034
PCT012A035
PCT012A036
PCT012A037
PCT012A038
PCT012A039
PCT012A040
PCT012A041
PCT012A042
PCT012A043
PCT012A044
PCT012A045
PCT012A046
PCT012A047
PCT012A048
PCT012A049
PCT012A050
PCT012A051
PCT012A052
PCT012A053
PCT012A054
PCT012A055
PCT012A056
PCT012A057
PCT012A058
PCT012A059
PCT012A060
PCT012A061
PCT012A062
PCT012A063
PCT012A064
PCT012A065
PCT012A066
PCT012A067
PCT012A068
PCT012A069
PCT012A070
PCT012A071
PCT012A072
PCT012A073
PCT012A074
PCT012A075
PCT012A076
PCT012A077
PCT012A078
PCT012A079
PCT012A080
PCT012A081
PCT012A082
PCT012A083
PCT012A084
PCT012A085
PCT012A086
PCT012A087
PCT012A088
PCT012A089
PCT012A090
PCT012A091
PCT012A092
PCT012A093
PCT012A094
PCT012A095
PCT012A096
PCT012A097
PCT012A098
PCT012A099
PCT012A100
PCT012A101
PCT012A102
PCT012A103
PCT012A104
PCT012A105
PCT012A106
PCT012A107
PCT012A108
PCT012A109
PCT012A110
PCT012A111
PCT012A112
PCT012A113
PCT012A114
PCT012A115
PCT012A116
PCT012A117
PCT012A118
PCT012A119
PCT012A120
PCT012A121
PCT012A122
PCT012A123
PCT012A124
PCT012A125
PCT012A126
PCT012A127
PCT012A128
PCT012A129
PCT012A130
PCT012A131
PCT012A132
PCT012A133
PCT012A134
PCT012A135
PCT012A136
PCT012A137
PCT012A138
PCT012A139
PCT012A140
PCT012A141
PCT012A142
PCT012A143
PCT012A144
PCT012A145
PCT012A146
PCT012A147
PCT012A148
PCT012A149
PCT012A150
PCT012A151
PCT012A152
PCT012A153
PCT012A154
PCT012A155
PCT012A156
PCT012A157
PCT012A158
PCT012A159
PCT012A160
PCT012A161
PCT012A162
PCT012A163
PCT012A164
PCT012A165
PCT012A166
PCT012A167
PCT012A168
PCT012A169
PCT012A170
PCT012A171
PCT012A172
PCT012A173
PCT012A174
PCT012A175
PCT012A176
PCT012A177
PCT012A178
PCT012A179
PCT012A180
PCT012A181
PCT012A182
PCT012A183
PCT012A184
PCT012A185
PCT012A186
PCT012A187
PCT012A188
PCT012A189
PCT012A190
PCT012A191
PCT012A192
PCT012A193
PCT012A194
PCT012A195
PCT012A196
PCT012A197
PCT012A198
PCT012A199
PCT012A200
PCT012A201
PCT012A202
PCT012A203
PCT012A204
PCT012A205
PCT012A206
PCT012A207
PCT012A208
PCT012A209
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.
 
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.