1. 학습
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  2. 강의
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  3. Data Manipulation with dplyr
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연습 문제

Counting by region

The counties dataset contains columns for region, state, population, and the number of citizens, which we selected and saved as the counties_selected table. In this exercise, you'll focus on the region column.

counties_selected <- counties %>%
  select(county, region, state, population, citizens)

지침

100 XP
  • Use count() to find the number of counties in each region, using a second argument to sort in descending order.