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boxplot and number of observations per box

2 messages · S Ellison, Gabor Grothendieck

Original
S Ellison
# 
Do you mean something like

y<-rnorm(50)
x<-factor(sample(letters[1:5],50,replace=T))
boxplot(y~x)
text(1:5,rep(min(y),5),paste("n=",tapply(y,x,length)) )
?
(You can fiddle about with the text placement easily enough).

Also note that boxplot's varwidth parameter provides a graphical
indication of group size;
boxplot(y~x, varwidth=T)
Dear all,
   
  How can I plot the number of observations per box in a boxplot. Many
thanks,
   
  Bernard
   
   

       
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Gabor Grothendieck
# 
Here is a variation in which the sample sizes appear under the
labels:

set.seed(1)
y <- rnorm(50)
x <- factor(sample(letters[1:5], 50, replace = TRUE))
bp <- boxplot(y ~ x, varwidth = TRUE)
mtext(paste("(n=", bp$n, ")", sep = ""), at = seq_along(bp$n), line =
2, side = 1)
On Jan 30, 2008 7:30 AM, S Ellison <S.Ellison at lgc.co.uk> wrote: