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.
This exercise is part of the course
Case Study: Exploratory Data Analysis in R
Exercise instructions
Add a group_by() to your code to summarize() within each year.
Hands-on interactive exercise
Have a go at this exercise by completing this sample code.
# Change this code to summarize by year
votes_processed %>%
summarize(total = n(),
percent_yes = mean(vote == 1))