Data Dictionary: Census 1980
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Survey: Census 1980
Data Source: U.S. Census Bureau
Table: T16. Sex By Age [55]
Universe: Persons
Table Details
T16. Sex By Age
Universe: Persons
Variable Label
T016_001
T016_002
T016_003
T016_004
T016_005
T016_006
T016_007
T016_008
T016_009
T016_010
T016_011
T016_012
T016_013
T016_014
T016_015
T016_016
T016_017
T016_018
T016_019
T016_020
T016_021
T016_022
T016_023
T016_024
T016_025
T016_026
T016_027
T016_028
T016_029
T016_030
T016_031
T016_032
T016_033
T016_034
T016_035
T016_036
T016_037
T016_038
T016_039
T016_040
T016_041
T016_042
T016_043
T016_044
T016_045
T016_046
T016_047
T016_048
T016_049
T016_050
T016_051
T016_052
T016_053
T016_054
T016_055
Relevant Documentation:
Excerpt from: Social Explorer; U.S. Census Bureau; Census of Population and Housing, 1980: Summary Tape File 3 [machine-readable data file] / conducted By the U.S. Bureau of the Census. Washington: Bureau of the Census [producer and distributor], 1982.
 
Sex
Ascertained on a complete-count basis.

Historical 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; Census of Population and Housing, 1980: Summary Tape File 3 [machine-readable data file] / conducted By the U.S. Bureau of the Census. Washington: Bureau of the Census [producer and distributor], 1982.
 
Age
Age at last birthday, i.e., number of completed years from birth to April 1, 1980, based on replies to a question on month and year of birth. This item was asked on a complete-count basis.

Because of the central importance of the data on age, the question contains redundancies. The age entry on the basic tape record is derived from the FOSDIC entries of quarter and year of birth. For those persons who do not provide this information but who do provide "age at last birthday," the census enumerator or clerk uses an equivalency table to mark the appropriate FOSDIC circles. The item "age at last birthday" is used only secondarily because of the tendency of some people, in reporting their ages, to round off to "0" or "5" (and to report even rather than odd numbers). The write-in entries of month and year of birth are requested because some people have difficulty with (and therefore skip) the FOSDIC marking system in this question.

Age is tabulated by single years of age and by many different groupings such as 5-year age groups. Basic records identify single years (and quarter years on sample basic records) to 112. Public-use microdata samples show single years and quarters to 99, and 100 years or more.

Median Age
Calculated as the value which divides the age distribution into two equal parts, one-half the cases falling below this value, one-half above. Median age is computed from the age intervals or groupings shown in the particular tabulation, and thus a median based on a less detailed distribution may differ slightly from a corresponding median for the same population based on a more detailed distribution. If the median falls in the terminal category, e.g., 75 years and over, the median is shown as the initial age of the category with a plus sign, e.g., 75+.

Limitations
In previous censuses, undercoverage of the population has been associated with age. Young adults, especially Black males, were missed at a higher rate than other segments of the population. The same is true of centenarians.

Historical comparability
Age data have been collected in each census since 1790. Counts in 1970 and 1980 for persons 100 years old
and over were substantially overstated.

See also: "Age of Householder".