Message-ID: <481243.45020.qm@web33101.mail.mud.yahoo.com>
Date: 2009-04-15T13:43:55Z
From: Michael Denslow
Subject: Kruskal's MDS results
Hi Dieter,
I'll take a shot at this.
As I understand it, the stress is telling you how the ordination distances compare with original dissimilarities that you calculated.
It is a measure how well your ordination has done in representing the relationship of your sites. Note that the stress will differ depending on how many dimensions are used. I believe the default is k = 2 in isoMDS.
Hope this helps,
Michael
>
> Dear List,
>
> I'm trying to interpret the results of the Kruskal's
> Non-metric Multidimensional Scaling algorithm (isoMDS, MASS
> package).
>
> The 'goodness of fit' is reported as "The final stress
> achieved (in percent)".
>
> What does this mean exactly? I've tried to google for an
> answer but I've not come up with a definitive answer.
>
> Regards,
> Dieter
>
>
> --
> Dieter Vanderelst
> PhD Student
>
> Active Perception Lab
> University of Antwerp
> http://batbits.webnode.com/
>
> Postal Address:
> Prinsstraat 13
> B-2000 Antwerp
> Belgium
Michael Denslow
Graduate Student
I.W. Carpenter Jr. Herbarium [BOON]
Department of Biology
Appalachian State University
Boone, North Carolina U.S.A.
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