Boxplot- input the median point and the median value

  Dear,

I am a newbie to R.

Now I am learning to draw boxplot using graphics().

I want to highlight the median position

with a round point and the value left (or on the top of)to the point.


   

Hi Elaine,

For your boxplot questions, I'll use the first example from the boxplot 
help page:

boxplot(count ~ spray, data = InsectSprays,
  col = "lightgray",yaxt="n")
axis(2,c(2,8,14,20),c(2,8,14,20))

For the "dotted to solid" question:

boxplot_info<-boxplot(count ~ spray,
  data = InsectSprays,col = "lightgray")
segments(rep(1:6,each=2),boxplot_info$stats[c(1,4),],
  rep(1:6,each=2),boxplot_info$stats[c(2,5),])

And finally, for the median value question:

boxplot_info<-boxplot(count ~ spray, data = InsectSprays,
  col = "lightgray")
points(1:6,boxplot_info$stats[3,])
text(1:6,boxplot_info$stats[3,]+1,boxplot_info$stats[3,])

A bit messy, but you get the idea.

Jim