Jie,

I'm not exactly sure what you're after.  Perhaps this will help you get
started.

count <- table(a)
prop <- count/length(a)
b <- plot(a)
text(b, count, prop, pos=1)

Jean


On Mon, Aug 26, 2013 at 11:27 AM, Jie <jimmycloud@gmail.com> wrote:

> Dear All,
>
> Suppose I have a categorical variable
> a=as.factor(sample(1:3,10,replace=T))
>
> plot(a) and hist(as.numeric(a),freq=F) would give the histogram of it.
> But I do not know how to add the counts or percentage information for
> plot.factor().
> hist() can do it but as a numeric variable, the x-axis is not 3
> categories in this case.
> Thank you for any suggestion.
>
> Best wishes,
> Jie
>
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