[S] xyplot function

Cande V Ananth (ananthcv@epi.umdnj.edu)
Tue, 8 Sep 1998 09:33:23 -0400

Dear S'ers:

I'm trying to use the "xyplot" function to produce a scatter plot with
a loess smooth, with the plots stratified on a third variable. The
stratifying variable has 4 levels, coded "No-abrupt", "<25%", "25-49%",
and "50+%". Everything works fine except that the order in which
the plots appear is not the one that I'd like to see.

The function plots in the following order: "<25%", "No-abrupt", "25-49%",
and "50+%". I'd like to see it plot exactly as I have described the 4
levels in the preceding paragraph. Here's the code that I used:

> xyplot(bwt ~ ga | abpl, aspect=1,
> panel = function(x,y){
> panel.xyplot(x,y)
> panel.loess(x,y,span=0.3,lwd=2)}
> )

I'm using S-Plus on the UNIX, version 3.4, release 1 (SunOS 5.3).
I'd appreciate any help. Thanks.

Cande V. Ananth
Assistant Professor                       Tel: (732) 235-7940
Div of Epidemiology and Biostatistics     Fax: (732) 235-6627
Dept of OB/GYN and Reproductive Sciences  ananthcv@EPI.UMDNJ.EDU
UMDNJ-Robert Wood Johnson Medical School  http://www.rwj-obgyn.umdnj.edu/
125 Paterson St, New Brunswick NJ 08901      homepages/Ananth/ananth.html   
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