[R] Visualising the effects of PCAs

Roland Goecke R.Goecke at t-online.de
Sun Oct 20 21:42:11 CEST 2002


this may sound like a very stupid question and perhaps it is, so I 
apologise in advance if anyone feels bored by it.

I have done some principal component analysis with prcomp and what I 
would like to do is to visualise the effect of a principal component, 
i.e. show a graph of my data and then show how that graph would change 
if I go, let's say, one standard deviation, in either direction. Kind of 
original graph plus graph with +1 s.d. plus graph with -1 s.d. I know 
how to plot several graphs together but how do I compute the points of 
the graphs with the PC effects in R?


r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !)  To: r-help-request at stat.math.ethz.ch

More information about the R-help mailing list