Show percent % instead of counts in charts of categorical variables

Question

I\'m plotting a categorical variable and instead of showing the counts for each category value.

I\'m looking for a way to get ggplot to display the perc

Answer 1

As of March 2017, with ggplot2 2.2.1 I think the best solution is explained in Hadley Wickham's R for data science book:

ggplot(mydataf) + stat_count(mapping = aes(x=foo, y=..prop.., group=1))

stat_count computes two variables: count is used by default, but you can choose to use prop which shows proportions.