Hi
is there a way to plot only the loadings in a biplot (with the nice arrows), and to skip the scores?
thanks christoph
Hi Christoph,
Three options I can think of:
1) Hack the source for biplot.princomp and biplot.default (which does the plotting) by commenting out the lines that plot the scores or altering the code to plot only the scores. You want to plot just y[,1] against y[,2] and ignore the x[,1] and x[,2] bits in biplot.default.
2) Write your own function based on biplot.default and biplot.princomp
3) If you don't like hacking/coding then see package vegan and the function scores, which has a method for class princomp, which can extract the loadings and the scores (in princomp terms, vegan calls them something else). Function ordiplot (also in vegan) provides direct plotting of various ordination results including objects from princomp.
All the best,
Gav
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