-------- Original Message --------
Subject: RE: DA or CVA?
Date: Mon, 6 Oct 2008 12:27:02 -0700 (PDT)
From: Dominique Adriaens <[EMAIL PROTECTED]>
To: <[email protected]>
References: <[EMAIL PROTECTED]>
Hi all,
I agree totally with Andrea that there is a lot of confusion in
literature, and would like to see this being cleared out. It is always a
drag to explain to students what the difference is.
In a slightly alternative of the second definition given by Andrea, I
also understood that in such an analysis, a DFA is a combination of a
MANOVA (so strictly the DFA part, yielding the p-levels, F-values, etc)
and an ordination (the CVA part - yielding CVA-scores and D²-values).
But of course, considering the confusion, I could be totally wrong.
Thanks
Dominique
Prof. Dr. Dominique Adriaens
Ghent University
Evolutionary Morphology of Vertebrates & Zoology Museum
K.L. Ledeganckstraat 35, B-9000 Gent
BELGIUM
tel: +32 9 264.52.19, fax: +32 9 264.53.44
E-mail: [EMAIL PROTECTED]
URL: http://www.fun-morph.ugent.be/
http://www.zoologymuseum.ugent.be/
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Subject: DA or CVA?
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Subject: DA or CVA?
Dear morphometricians,
a very simple question for you, please.
What's the difference between CVA and DA?
They're often used as synonyms. Sometimes, DA is used when only 2 groups are
avaialable and CVA when it's a multigroup DA. Other times, it seems that the
term DA is preferred when the purpose is to classify specimens and the term
CVA when the focus is more on ordinations rather than on proportions of
correctly classified specimens.
If this is all, they're just differences in terminology.
If I remember well, however, there's a more subtle and more substantial
difference which is, possibly, explained in Numerical Taxonomy, that
unfortunately I do not have handy.
I'd greatly appreciate your comments and advice.
Thanks in advance.
Cheers
Andrea
Dr. Andrea Cardini
Lecturer in Animal Biology
Museo di Paleobiologia e dell'Orto Botanico Universitá di Modena e Reggio
Emilia via Università 4, 41100, Modena, Italy
tel: 0039 059 2056520
fax: 0039 059 2056535
&
Hull York Medical School
The University of York, Heslington, York YO10 5DD, UK
E-mail address: [EMAIL PROTECTED], [EMAIL PROTECTED],
[EMAIL PROTECTED] http://hyms.fme.googlepages.com/drandreacardini
http://ads.ahds.ac.uk/catalogue/archive/cerco_lt_2007/overview.cfm#metadata
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