Description Usage Format References See Also Examples
US national population by four groups from 1900 to 1979. The four groups are: Age 0; Age 20; Age 40; Age 60.
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A data frame with 320 observations on 3 variables.
age | numeric | the group variable of age |
year | numeric | a numeric vector, giving year |
population | numeric | a numeric vector, giving population in millions |
https://www.census.gov/data/tables/time-series/demo/popest/pre-1980-national.html, U.S. Census Bureau, National Intercensal Tables: 1900-1990. Last Revised: November 30, 2016
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