Summarizing by state and region
You can group by multiple columns instead of grouping by one. Here, you'll practice aggregating by state and region, and notice how useful it is for performing multiple aggregations in a row.
counties_selected <- counties %>%
select(region, state, county, population)
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 and summarize to find the total population
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