[R] Graph superimposition

Peter Dalgaard BSA p.dalgaard at biostat.ku.dk
Tue May 2 18:57:42 CEST 2000


Marc Feldesman <feldesmanm at pdx.edu> writes:

> I'm running a four-group, 15-variable discriminant analysis using the MASS 
> function lda().  Discriminant functions 1 and 2 explain about 93% of the 
> variance.  I would like to plot the group scatters in a single scatterplot, 
> identify each group's centroid, and encircle the group scatter with a 90% 
> bivariate confidence ellipse.  I can do this for each group on a separate 
> plot, but I cannot figure out how to place all information on a single 
> plot.   In S-Plus I use trellis graphics with panel.superpose as a trellis 
> option.
> 
> I know that R does not support trellis graphics, but is there another way 
> to accomplish this in R?  (I'm using 1.0.1 under Windows NT 4).

Well, you can always superimpose plots by using the following paradigm

  plot(1:10)
  par(new=T)
  plot(1:10,cex=2)

There might be a simpler way using the features for adding items to
a plot (e.g. points(), lines()).

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907
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