使用带有数字 x 轴的 ggplot 在 R 中绘制类别变量在 y 轴上的比例

Question

Here's some example data:

result  age
y   20
y   20
n   20
n   20
y   21
n   21
n   21
n   21
y   22
n   22
n   22

I would like to plot the proportion of " y " as a total of " result " on the y-axis against " age " on the x-axis, displayed as a line graph and preferably also with the dot representing the proportion / frequency of y ( geom_point ). I don't want to display " n ". Preferably using ggplot2 because I always use that.

Many thanks for any help

Answer 1

You can summarize the data with dplyr and then plot the summarized data frame rather than the original data frame

library(dplyr)
library(ggplot2)

df %>% 
  group_by(age) %>% 
  summarise(p = mean(result == 'y')) %>% 
  ggplot(aes(x = age, y = p)) +
    geom_point() + 
    geom_line()