Show percent of total on top of geom_bar in ggplot2 while showing counts on y axis

问题

I'm trying to create a bar plot with ggplot2, showing counts on the y axis, but also the percents of total on top of each bar. I've calculated the counts and percents of total, but can't figure out how to add the percents total on top of the bars. I'm trying to use geom_text, but not able to get it work.

A minimal example:

iris %>% 
  group_by(Species) %>% 
  summarize(count = n()) %>% 
  mutate(percent = count/sum(count)) %>% 
  ggplot(aes(x=Species, y=count)) +
    geom_bar(stat="identity") + 
    geom_text(aes(label = scales::percent(..prop..), y=..count..), stat= "count", vjust = -.5)

I have looked at other answers like How to add percentage or count labels above percentage bar plot?, but in those examples, both the y axis and labels show percents. I am trying to show counts on the y axis and percents in the labels.

回答1:

Just use percent as label.

iris %>% 
  group_by(Species) %>% 
  summarize(count = n()) %>% 
  mutate(percent = count/sum(count)) %>% 
  ggplot(aes(x=Species, y=count)) +
  geom_col() +
  geom_text(aes(label = paste0(round(100 * percent, 1), "%")), vjust = -0.25)

回答2:

library(dplyr)
library(ggplot2)
df1 = iris %>% 
    group_by(Species) %>% 
    summarize(count = n()) %>% 
    mutate(percent = count/sum(count))
ggplot(data = df1, aes(x = Species, y = count, label = paste0(round(percent,2),"%"))) +
    geom_bar(stat="identity") +
    geom_text(aes(y = count*1.1))

来源：https://stackoverflow.com/questions/50520228/show-percent-of-total-on-top-of-geom-bar-in-ggplot2-while-showing-counts-on-y-ax