plot number of data points in r

Question

I am using the following in R to generate a Boxplot out of a given set of data:

ggplot(data = daten, aes(x=Bodentyp, y=Fracht)) + geom_boxplot(aes(fill=Bewirtschaftungsform))

Now I want to display the number of data points going into each category of the column "Bodentyp". How do I achieve this?

I'm not quite sure what you exactly want to have (perhaps some data and/or the expected (visual) output would help), but does adding geom_jitter(aes(colour = Bewirtschaftungsform)) do what you like to have? — Daniel
– Daniel, Commented Jun 30, 2015 at 13:34

Rorschach · Accepted Answer · 2015-06-30 14:02:11Z

4

You can use fun.datato apply a function (f) to the grouped data to return a count (length(y)) and a position for the label (median(y))

f <- function(y) 
    c(label=length(y), y=median(y))

library(ggplot2)
data(mtcars)
ggplot(mtcars, aes(x=as.factor(cyl), y=mpg)) +
  geom_boxplot() + theme_bw() +
  stat_summary(fun.data=f, geom="text", vjust=-0.5, col="blue")

enter image description here

answered Jun 30, 2015 at 14:02

Rorschach

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