Summarizing by year
The summarize() function is especially useful because it can be used within groups.
For example, you might like to know how much the average "agreeableness" of countries changed from year to year. To examine this, you can use group_by() to perform your summary not for the entire dataset, but within each year.
Este exercício faz parte do curso
Case Study: Exploratory Data Analysis in R
Instruções do exercício
Add a group_by() to your code to summarize() within each year.
Exercício interativo prático
Experimente este exercício completando este código de exemplo.
# Change this code to summarize by year
votes_processed %>%
summarize(total = n(),
percent_yes = mean(vote == 1))