At 9:54 PM +0200 9/9/08, Bernd Panassiti wrote:
hello,
subsequently to a NMDS analysis (performed with metaMDS or isoMDS) is
it possible to
rotate the axis through a varimax-rotation?
Thanks in advance.
Bernd Panassiti
Bernd,
Yes. The output of isoMDS is an object with points and stress.
consider the following example:
test.data <- Harman74.cor$cov #twenty four mental measurements
harm.dist <- sqrt(2*(1- test.data) ) #convert correlations to distances
harm.iso <- isoMDS(harm.dist,k=2) # find the multidimensional solution
harm.varimax <- varimax(harm.iso$points) #rotate with varimax
op <- par(mfrow=c(1,2))
plot(harm.iso$points, main="unrotated")
plot(harm.varimax$loadings,main="rotated")
Bill
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