[R] Pca loading plot lables
Jari Oksanen
jarioksa at sun3.oulu.fi
Mon Apr 25 14:00:42 CEST 2005
On Mon, 2005-04-25 at 13:21 +0200, Frédéric Ooms wrote:
> Dear colleagues,
> I a m a beginner with R and I would like to add labels (i.e. the variable names) on a pca loading plot to determine the most relevant variables. Could you please tell me the way to do this kind of stuff.
> The command I use to draw the pca loading plot is the following :
> Plot(molprop.pc$loading[,1] ~ molprop.pc$loading[,2])
> Thanks for your help
Have you tried 'biplot' and found it unsatisfactory for your needs?
biplot(pr)
Alternatively, you can do it by hand:
plot(pr$loadings, type="n")
text(pr$loadings, rownames(pr$loadings), xpd=TRUE)
abline(h=0); abline(v=0)
If you really want to have Axis 2 as horizontal, then you must replace
all pr$loadings pieces with pr$loadings[,2:1].
cheers, jari oksanen
--
Jari Oksanen <jarioksa at sun3.oulu.fi>
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