Adding points to multiple boxplots

Question

How would you add points to a several boxplots beside one another of varying lengths?

boxplot(box1, box2, box3, box4, beside=T, col=c(\"grey100\", \"grey70\"         


        

Answer 1

Try:

ndata=mtcars[mtcars$carb%in%c(1:4),]
boxplot(mpg ~ carb, data=ndata 
        , beside=T,
        col=c("grey100", "grey70", "grey50", "grey70"),
        names=c("box1", "box2", "box3", "box4"),
        main="all the boxes", las=2)

points(factor(ndata$carb), ndata$mpg,col=3)
points(3,30,col=4,pch=13)
text (3.5,30,"Oops",pos = 4)