Finding the lowest-income state in each region
You've been learning to combine multiple dplyr verbs together. Here, you'll combine group_by(), summarize(), and slice_min() to find the state in each region with the highest income.
When you group by multiple columns and then summarize, it's important to remember that the summarize "peels off" one of the groups, but leaves the rest on. For example, if you group_by(X, Y) then summarize, the result will still be grouped by X.
counties_selected <- counties %>%
select(region, state, county, population, income)
Questo esercizio fa parte del corso
Data Manipulation with dplyr
Istruzioni dell'esercizio
- Calculate the average income (as
average_income) of counties within each region and state (notice thegroup_by()has already been done for you). - Find the state with the lowest
average_incomein each region.
Esercizio pratico interattivo
Prova a risolvere questo esercizio completando il codice di esempio.
counties_selected %>%
group_by(region, state) %>%
# Calculate average income
___
# Find the lowest income state in each region
___