You asked for SPSS or SYSTAT, but I can't resist mentioning how easy this is in R.
For most cases something as simple as the code below would work. All you need is a data frame (my.data) with your variables as columns. my.pca <- prcomp(~ var1 + var2 + var3, data=my.data) summary(my.pca) my.pca$rotation screeplot(my.pca, npcs=3, type="lines") biplot(my.pca) In the R console... ?read.table -- getting the data into a data.frame ?prcomp OR ?princomp -- for the PCA (see 'center' and 'scale' options) ?biplot -- for the biplot ?screeplot -- for a scree plot HTH, Dave Hewitt ---- Original message ---- >Date: Fri, 2 May 2008 01:56:11 -0700 >From: Dragos Zaharescu <[EMAIL PROTECTED]> >Subject: [ECOLOG-L] Biplot on PCA >To: [email protected] > >Dear ecologers, > >I would much appreciate if someone could provide some information on how to >run Biplot on PCA (either for SPSS or SYSTAT)? > >Many thanks > >George @ Kingston University > > > > ____________________________________________________________________________________ >Be a better friend, newshound, and >know-it-all with Yahoo! Mobile. Try it now. >http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ
