[R] Dotchart showing mean and median by group

[Gabor Grothendieck]

On Wed, May 9, 2012 at 3:25 AM, maxbre <mbressan at arpa.veneto.it> wrote:
> Given this example
>
> mean.values<-colMeans(VADeaths)
>
> mean.values<-apply(VADeaths, 2, mean)
> median.values<-apply(VADeaths, 2, median)
>
> dotchart(VADeaths, gdata=mean.values)
> dotchart(VADeaths, gdata=median.values)
>
> is it possible to “combine” a single dotchart showing both the mean and the
> median for each single group (with different plotting symbols)?
>

Try this:

dotchart(VADeaths, gdata=mean.values)
par(new = TRUE)
dotchart(VADeaths, gdata=median.values, gpch = 20)

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