Summarizing by state
Another interesting column is land_area, which shows the land area in square miles. Here, you'll summarize both population and land area by state, with the purpose of finding the density (in people per square miles).
counties_selected <- counties %>%
select(state, county, population, land_area)
Deze oefening maakt deel uit van de cursus
Data Manipulation with dplyr
Praktische interactieve oefening
Probeer deze oefening eens door deze voorbeeldcode in te vullen.
counties_selected %>%
# Group by state
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# Find the total area and population
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