[R] boxplot knowing Q1, Q3, median, upper and lower whisker value

[William Dunlap]

is.nan(bd.coerce(as.bdVector(c(1.0, N> -----Original Message-----
> From: r-help-bounces at r-project.org 
> [mailto:r-help-bounces at r-project.org] On Behalf Of Brian Diggs
> Sent: Thursday, September 09, 2010 12:41 PM
> To: David A.
> Cc: R-help
> Subject: Re: [R] boxplot knowing Q1, Q3, median,upper and 
> lower whisker value
> 
> On 9/6/2010 8:46 AM, David A. wrote:
> >
> > Dear list,
> >
> > I am using a external program that outputs Q1, Q3, median, upper and
> > lower whisker values for various datasets simultaneously in a tab
> > delimited format. After importing this text file into R, I 
> would like
> > to plot a boxplot using these given values and not the original
> > series of data points, i.e. not using something like
> > boxplot(mydata).
> >
> > Is there an easy way for doing this? If I am not wrong, boxplot()
> > does not accept these values as parameters.

I believe boxplot(x,y,z) computes the required statistics
and passes them to the bxp() function for plotting.  If
you have the statistics you can pass them to bxp() yourself.
You might call trace(bxp) followed by a call to boxplot()
to see how boxplot uses bxp.

Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com 

> >
> > Cheers,
> >
> > Dave  [[alternative HTML version deleted]]
> 
> If you use ggplot2, you can specify the aesthetics lower, 
> upper, middle, 
> ymin, and ymax directly to variables in geom_boxplot.  Just 
> be sure to 
> set stat="identity" so that it does not try to summarize your 
> data again.
> 
> --
> Brian Diggs
> Senior Research Associate, Department of Surgery
> Oregon Health & Science University
> 
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