[R] biplot drawing conc ellipses

[Pierre BADY]

Hi all,

you can see in the library(ade4).
there is  a nice graphical function called ‘s.class’.

Example for a principal components analysis:
?s.class

data(meaudret)
pca1 <- dudi.pca(meaudret$mil, scan = FALSE, nf = 4)
# plot row coordinates 
s.class(pca1$li, meaudret$plan$dat, sub = "Principal Component Analysis",add.
p=F,col=c(1,2,3,4),cstar=0)
# add principal axes
s.arrow(pca1$c1,clabel=0.7,add.p=T)


# &#8220;&#8230;  'scatter.dudi' is a factorial map of individuals and the
# projection of the vectors of the canonical basis multiplied by a
# constante of rescaling. &#8230;&#8221;

?scatter.dudi
scatter.dudi(pca1,clab.row=0)
s.class(pca1$li, meaudret$plan$dat, sub = "Principal Component Analysis",add.
p=T,col=c(1,2,3,4), cstar=0)

hope this helps,


P.BADY

Quoting "T. Murlidharan Nair" <nair at sdsc.edu>:

> Is there an option to draw concentration ellipses in biplots ? It
> seems
> really nice to summarize large number of points of each group.
> 
> Cheers../ Murli
> 
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