On 20/08/2009, at 12:41 PM, S Ellison wrote:
The OP asked how to plot mild and extreme outliers
with distinct plotting symbols. ...
In fact it can't be done!
I hate to contradict (yeah, right! ;-) ) but actually the basic info
needed for distinguishing different extents of outlier is available in
the help files if you read through sufficiently to understand how
boxplot and bxp.default operate.
Sigh. ***IT CAN'T BE DONE*** simply by specifying an argument
to the boxplot() function, which was clearly the intent of
the OP's question.
Certainly bxp and boxplot do not do that by themselves, and it is, er,
optimistic to expect a beginner to work out how to put it together
with
nothing but the help pages.
Exactly.
But boxplot does return the group stats and
the identified outliers per group and with plot=FALSE no plot is
generated, so it can be done with only modest ingenuity.
Modest to you maybe. A good day's work for me, and possibly
a month's for a newbie.
It is however wonderful how well designed R is, thus allowing
this sort of modification/adaptation to be achieved very simply,
provided that one is clever enough.
cheers,
Rolf Turner
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