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.
Deze oefening maakt deel uit van de cursus
Case Study: Exploratory Data Analysis in R
Oefeninstructies
Add a group_by() to your code to summarize() within each year.
Praktische interactieve oefening
Probeer deze oefening eens door deze voorbeeldcode in te vullen.
# Change this code to summarize by year
votes_processed %>%
summarize(total = n(),
percent_yes = mean(vote == 1))