[R] error bars in line plots
Frank E Harrell Jr
fharrell at virginia.edu
Mon Oct 7 13:58:58 CEST 2002
On Mon, 7 Oct 2002 09:23:08 +0200 (CEST)
Ott Toomet <siim at obs.ee> wrote:
> On 6 Oct 2002, Myriam Abramson wrote:
>
> |Hi!
> |
> |Could you tell me how I can draw a graph with error bars?
> |Sorry, I don't use R that often and I couldn't find it easily in the
> |documentation.
>
> There is no errorbars function in the package. But you may easily construct
> your own using segments(). I add my own versions below (actually, why not
> put something similar into the base package?).
>
> You may use it as:
> plot(x,y)
> errorbars(x,y, dy=dy)
>
> The second function is for using with matplot().
>
> Ott
>
> -----------------------
>
> errorbars <- function(x, y, dy=NULL, dx=NULL, ...) {
. . .
Also look at errbar and xYplot in the Hmisc library. -Frank Harrell
--
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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