[R] adding the mean and standard deviation to boxplots

jim holtman jholtman at gmail.com
Wed Jul 23 13:20:59 CEST 2008


This is the underlying routine called by boxplot and you can supply
your own values to the 5 that define a boxplot.

On Wed, Jul 23, 2008 at 2:24 AM, Fernando Marmolejo-Ramos
<fernando.marmolejoramos at adelaide.edu.au> wrote:
> Dear users
> This is a message I was directing to Harold Baize but because I pressed the
> wrong button the message got lost grrrr!!!
> So I'm doing it all over again:
> Lets suppose I have three batches of data:
> a <- rnorm(50,2500,300)
> b <- rnorm(50,3500,250)
> c <- rnorm(50,4000,200)
> # Now I want to plot them as boxplots and violin plots
> require(vioplot)
> vioplot (a,b,c, horizontal=T, col="white")
> boxplot (a,b,c, horizontal=T, col="white")
> As we know boxplot show the least-greates values, lower-upper quartiles, the
> mean, and outliers (when present).
> However, for some data is not important the MEDIAN but the MEAN. Also, it is
> more relevant to show ERROR BARS instead of quartiles.
> So, how could I see (for the batches of data I introduced above)…
> 1.      a boxplot showing the MEAN and the SD instead of the lower/upper
> quartile?
> 2.      a boxplot showing the MEAN and the STANDARD ERROR OF THE MEAN instead of
> the lower/upper quartile?
> 3.      a boxplot showing the MEAN and the 95% CI instead of the lower/upper
> quartile?
> (I think in all these cases is preferable to have visual access, or to have
> the line that shows, the LEAST and the GREATEST VALUES.)
> In other words, that the ERROR BARS (95% CI, SD, SE) proposed here take the
> place of the boxes usually used to represent the lower/upper quartile.
> Now, the big question, is all this jazz possible to be implemented in violin
> plots as well?
> How could that be done?
> Cheers,
> Fernando
> --
> View this message in context: http://www.nabble.com/adding-the-mean-and-standard-deviation-to-boxplots-tp15271398p18604571.html
> Sent from the R help mailing list archive at Nabble.com.
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Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem you are trying to solve?

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