US national population by four groups from 1900 to 1979. The four groups are: Age 0; Age 20; Age 40; Age 60.
A data frame with 320 observations on 3 variables.
||numeric||the group variable of age|
||numeric||a numeric vector, giving year|
||numeric||a numeric vector, giving population in millions|
www.census.gov/popest/archives/pre-1980/PE-11.html, U.S. Census Bureau, Population Division. Internet Release date: October 1, 2004
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