[R] boxplot and number of observations per box

[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:
> 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)
>
>
>
>
> >>> Marc Bernard <bernarduse1 at yahoo.fr> 30/01/2008 11:43:15 >>>
> Dear all,
>
>  How can I plot the number of observations per box in a boxplot. Many
> thanks,
>
>  Bernard
>
>
>
>
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