[R] What is that?

Thomas Lumley thomas at biostat.washington.edu
Thu Jul 13 19:29:40 CEST 2000

On Thu, 13 Jul 2000, Yves Gauvreau wrote:

> Hi,
> I did a scatter plot involving to variables x and y where x is a 2
> levels factor and y is a numeric "vector". I kind of expected to see a
> series of points for both levels of x, which I got. But in addition
> there is also an horizontal rectangle and a line for both levels. My
> question is what's the meaning of these?

Sounds like a boxplot to me. If x is a factor then plot.factor will be
called, which gives a boxplot if y is numeric and a barplot if y is a
factor or is missing [help(plot.factor)].

>From your description it sounds as though y is very skewed, so the boxplot
looks strange.  


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