Description Usage Format Variables References Examples
Population figures for the entire United States of America from the decennial census.
1 |
A data frame with 23 observations of 2 variables.
year
: date of the census.
population
: population of the state or territory.
This dataset has been gathered by the NHGIS. Minnesota Population Center, National Historical Geographic Information System: Version 2.0 (Minneapolis: University of Minnesota, 2011).
1 2 3 4 5 6 7 | head(us_national_population)
if(require(ggplot2)) {
ggplot(us_national_population,
aes(x = year, y = population)) +
geom_line() +
ggtitle("Population of the United States, 1790-2010")
}
|
year population
1 1790 3929625
2 1800 5308483
3 1810 7239881
4 1820 9638239
5 1830 12860702
6 1840 17063353
Loading required package: ggplot2
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