R help - Sep 2008 - NMDS and varimax rotation

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

have you looked at the vegan viginette- I know there is proscrutes rotation.

On Tue, Sep 9, 2008 at 3:54 PM, Bernd Panassiti
<bernd.panassiti at uni-rostock.de> 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
>
> ______________________________________________
> R-help at r-project.org mailing list
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> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>


-- 
Stephen Sefick
Research Scientist
Southeastern Natural Sciences Academy

Let's not spend our time and resources thinking about things that are
so little or so large that all they really do for us is puff us up and
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annoying little problems of being mammals.

	-K. Mullis

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


>
>______________________________________________
>R-help at r-project.org mailing list
>https://stat.ethz.ch/mailman/listinfo/r-help
>PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>and provide commented, minimal, self-contained, reproducible code.

-- 
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