[R] Superposing data on boxplot

Peter Wolf s-plus at wiwi.uni-bielefeld.de
Tue May 4 17:14:28 CEST 2004

What about:


Peter Wolf

Ted Harding wrote:

>Hi folks,
>I have a vaiable Y and an associated factor Z at several (13)
>  boxplot(Y~Z)
>produces a nice array of boxplots, one for each level of Z,
>and each duly labaelled with its level of Z.
>I would like to superpose on each boxplot the actual data
>points which it represents, i.e. do something conceptually
>(though not in real R) expressed as
>  points(Y~Z)
>  points(Z,Y)
>It can be done "with bare hands" along the lines of
>  B<-boxplot(Y~Z)
>  x<-bxp(B)
>  X<-rep(x,ngroups)
>  points(X,Y)
>where ngroups is the number of data at each level of Z,
>*provided* the data are pre-sorted by level of Z and in the
>same order as these levels occurr in the boxplot. But of course
>they're not!
>OK, I could do this by hand as well, but now it's getting a bit
>tedious, and I'm wondering if there's a better way.
>Thanks for any suggestions,
>E-Mail: (Ted Harding) <Ted.Harding at nessie.mcc.ac.uk>
>Fax-to-email: +44 (0)870 167 1972
>Date: 04-May-04                                       Time: 15:48:23
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