如何使用 R 在箱线图上显示特定的已知值？

Question

To be more specific, I have one value as a result of my analysis and I want to show where this specific value correspondence on the related boxplot.

I want to get something like the image. The red point will be the result of my analysis. Thank you in advance.

Answer 1

Create a new data frame with the points you want to mark and use geom_point .

library(ggplot2)

ggplot(mpg, aes("", hwy)) +
  geom_boxplot() +
  geom_point(data = data.frame(hwy = 30), color = "red")