[R] biplots for PCA

Scott Chamberlain
2011-05-13T15:32:49Z

Have you looked into the options for par?, which it looks like can be included
in your call to biplot, perhaps adj or something else to reduce overlap.

Scott
On Friday, May 13, 2011 at 4:38 AM, Anna Renwick wrote:
> Hi all
>
> I have produced a biplot for a PCA (see attached pdf) that I ran however
the
> names of the variables which are placed at the end of the arrows overlap
and
> are thus unreadable. Similarly some of the numbered points overlap. I was
> wondering if there was a way to edit the biplot to move the label names and
> if not what the best alternative is.
>
> Thanks
> Anna
>
> pca<-biodata[,3:10]
> model<-prcomp(pca,scale=TRUE)
> summary(model)
> biplot(model)
>
>
> --
> Dr Anna R. Renwick
> Research Ecologist
> British Trust for Ornithology,
> The Nunnery,
> Thetford,
> Norfolk,
> IP24 2PU,
> UK
> Tel: +44 (0)1842 750050; Fax: +44 (0)1842 750030
> ______________________________________________
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> PLEASE do read the posting guide
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> and provide commented, minimal, self-contained, reproducible code.
>
> Attachments:
> - PCA.pdf
>
>


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