Display actual numerical median on boxplot

[Kim]

Hi there,

I would like to display the actual numeric value of the median next to
the median line of the boxplots (or anywhere on the plot really, if
there is an easy way to do this). Could anyone help with this?

Here is my code for the boxplot that does not display the numeric
value of the median.
qplot(Calculator,score,data=ds,geom=c("boxplot"),fill=disease)

Thank you very much for your help; it is greatly appreciated.

Best wishes,

Kim

[Brandon Hurr]

Kim, 

Since I didn't have your dataset I used the diamonds one that comes with ggplot2. 

Here's what I came up with...

require(ggplot2)

median.s<-ddply(diamonds, .(cut), function(df) {

return(median(df$depth))

})

p<-ggplot(data=diamonds, aes(label=median.s$V1))

p1<-p+geom_boxplot(aes(x=cut, y=depth))

p2<-p1 + geom_text(data = median.s, aes(x=cut, y= V1, label = V1, hjust = -2, vjust = 0.5))

p2

I mangled it together so maybe someone can come up with something more elegant, but it seems to work. You can adjust the position with the justifications. I can't get them exactly in the right positions for my preferences. Again, someone else might know better. 

Brandon

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