----- Forwarded message from andrea cardini <alcard...@gmail.com> -----
Date: Mon, 25 Feb 2013 03:41:07 -0500
From: andrea cardini <alcard...@gmail.com>
Reply-To: andrea cardini <alcard...@gmail.com>
Subject: Re: TPS outlining method
To: morphmet@morphometrics.org
Dear Eloise,
I am not sure if this may help, but you can find
an intro to GMM in this preprint:
https://docs.google.com/file/d/0BxZeFy3y3MEpOFp4ZHJzRnNWdzQ/edit?usp=sharing
Something more in that line (examples, intro and
many refs) is in Viscosi & Cardini, 2011, Plos
One http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0025630
I also suggest you to read Oxnard & O'Higgins,
2009, and Klingenberg, 2008 (refs in the EOLSS preprint).
Where and how many points you digitize is
strictly functional to the specific hypothesis
you're testing. Of course, you'll have to factor
in practical considerations (i.e., how much
knowledge you have on the study structure, what
kind of points are available etc.). Probably, if
you use semilandmarks, you might want to do some
sensitivity analysis in relation to how you
digitize those points (density, spacing etc.).
There are suggestions on this, if I remember
well, in Gunz et al., 2009 (also in the refs of
the EOLSS paper) and in the Green Book by
Zelditch et al (I have the 2004 version but there's now a new edition).
Bear in mind that Procrustes based methods cannot
tell you if variation occurs at specific points
within a landmark configuration. This is because
of the arbitrariness of the choice of the
superimposition (Procrustes or other): see Figure
9 of Viscosi & Cardini about this and some of the
suggested refs. You might be, however, able to
work on subsets following the examples of people working on modularity.
Good luck.
Cheers
Andrea
At 08:08 24/02/2013, you wrote:
><mailto:ec...@fau.edu>ec...@fau.edu.
Dr. Andrea Cardini
Researcher in Animal Biology
Dipartimento di Scienze Chimiche e Geologiche,
Università di Modena e Reggio Emilia, l.go S. Eufemia 19, 41121 Modena, Italy
Honorary Fellow
Centre for Anatomical and Human Sciences
University of Hull, Cottingham Road, Hull, HU6 7RX, UK
University of York, Heslington, York YO10 5DD, UK
Adjunct Associate Professor
Centre for Forensic Science , The University of Western Australia
35 Stirling Highway, Crawley WA 6009, Australia
E-mail address: alcard...@gmail.com, andrea.card...@unimore.it
Webpage: http://sites.google.com/site/hymsfme/drandreacardini
Datasets:
http://ads.ahds.ac.uk/catalogue/archive/cerco_lt_2007/overview.cfm#metadata
Editorial board for:
Zoomorphology:
http://www.springer.com/life+sciences/animal+sciences/journal/435
Journal of Zoological Systematics and
Evolutionary Research: http://www.wiley.com/bw/journal.asp?ref=0947-5745&site=1
Hystrix, the Italian Journal of
Mammalogy: http://www.italian-journal-of-mammalogy.it/
----- End forwarded message -----
