Summarizing by year and country
You're more interested in trends of voting within specific countries than you are in the overall trend. So instead of summarizing just by year, summarize by both year and country, constructing a dataset that shows what fraction of the time each country votes "yes" in each year.
Cet exercice fait partie du cours
Case Study: Exploratory Data Analysis in R
Instructions
Change the code in the editor to group by both year and country rather than just by year. Save the result as by_year_country.
Exercice interactif pratique
Essayez cet exercice en complétant cet exemple de code.
# Group by year and country: by_year_country
votes_processed %>%
group_by(year) %>%
summarize(total = n(),
percent_yes = mean(vote == 1))