[R] Boxplots using percentiles?

Frank E Harrell Jr fharrell at virginia.edu
Mon Nov 26 01:16:07 CET 2001


The last things to be ready in my porting the Hmisc library to R are Trellis-related functions.  When I have ported panel.bpplot, which extends work of Jeff Banfield, that panel function offers a huge number of options for constructing box plots.  You can specify multiple percentiles and various ranges of raw data (rug plots) to show.

If you are already familiar with Grid/Lattice and would like to port panel.bpplot as a replacement for panel.bwplot, I would be glad to send you the code.

Frank Harrell

On Mon, 26 Nov 2001 11:25:36 +1300
Nick Davis <Nick.Davis at treasury.govt.nz> 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?  
> nb, I'm plotting multiple boxplots on a single chart so a function that
> applies to multiple series would be useful.
> Thanks,
> Nick

Frank E Harrell Jr              Prof. of Biostatistics & Statistics
Div. of Biostatistics & Epidem. Dept. of Health Evaluation Sciences
U. Virginia School of Medicine  http://hesweb1.med.virginia.edu/biostat
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