[R] Error bars.

[Frank E Harrell Jr]

The errbar function in the Hmisc library for R/S+ is not as comprehensive as the S+ error.bar function but it does most of what's needed (for vertical bars anyway).  It was originally written by Geyer in 1991.  There is another version of it ('error') which is a function internal to xYplot when lattice/grid is in effect.  -Frank Harrell

On Mon, 17 Jun 2002 11:11:39 -0300 (ADT)
Rolf Turner <rolf at math.unb.ca> wrote:

> 
> There was an inquiry on this list recently about plotting some simple
> error bars on a graph.  Now Splus has a function (error.bar ---
> originally written by Sue Clancy of DMS, CSIRO, I believe) to do this
> job virtually at the touch of a key.  (Well a few keys. :-) )  The
> error.bar function is written completely in raw S --- no calls to
> ``.Internal'' or anything like that.  So it would be trivial to port
> over to R.
> 
> My question is:  Is doing so legal?  Moral?  (Given that Splus is
> proprietary, and error.bar is a ``built-in'' part of that package,
> and not something out of statlib, or like that.)
> 
> 				cheers,
> 
> 					Rolf Turner
> 					rolf at math.unb.ca
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-- 
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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