[R] Boxplots using percentiles?

Robert Gentleman rgentlem at jimmy.harvard.edu
Sun Nov 25 23:53:31 CET 2001

On Mon, Nov 26, 2001 at 11:25:36AM +1300, Nick Davis wrote:
> The standard R boxplot appears to use quartiles to determine the height of
> the rectangles and a range parameter - RNG - (default=1.5 I think) that
> determines the length of the whiskers as <= RNG x Interquartile Range.  Is
> it possible to instead define the range as extending to the 95th percentile?
> If so, how would this be done?  

 You need to create the right kind of thing to call bxp -- which has
 some documentation but basically it is the z component that you need
 to construct.

 You can call boxplot with plot=FALSE to get it to do most of the work
 and then just fiddle with the parts you want to change

> nb, I'm plotting multiple boxplots on a single chart so a function that
> applies to multiple series would be useful.
> Thanks,
> Nick

| Robert Gentleman                 phone : (617) 632-5250                   |
| Associate Professor              fax:   (617)  632-2444                   |
| Department of Biostatistics      office: M1B28
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