Horizontal line with individual Mean value in GGplot

Hello Anders,

Welcome to RStudio Community. It is most useful if you can provide a reproducible example of your data and code. Please read the below link carefully as to how to produce one:

FAQ: What's a reproducible example (reprex) and how do I create one?

A generic example of something similar is below:


tibble(iris) |> 
  group_by(Species) |> 
  mutate(mean = mean(Petal.Width)) |> 
  ggplot(aes(x = Petal.Width)) +
  geom_density() +
  geom_vline(aes(xintercept = mean)) +
  facet_wrap(~Species, scales = "free")

Created on 2022-01-25 by the reprex package (v2.0.1)