-------- Original Message --------
Subject: RE: Calculation of Procrustes distances
Date: Mon, 21 Nov 2011 19:46:43 -0500
From: F. James Rohlf <ro...@life.bio.sunysb.edu>
Reply-To: ro...@life.bio.sunysb.edu
Organization: Stony Brook University
To: morphmet@morphometrics.org
The tpsSmall program will output matrices of Procrustes distances.
However, an easier way to compute that rate would be to just use tpsRegr
to regress shape on size (usually ln(centroid size)).
----------------------
F. James Rohlf, John S. Toll Professor
Dept. Ecology and Evolution, Stony Brook University, NY 11794-5245
Please consider the environment before printing this email
-----Original Message-----
From: morphmet [mailto:morphmet_modera...@morphometrics.org]
Sent: Monday, November 21, 2011 2:20 PM
To: morphmet
Subject: Calculation of Procrustes distances
-------- Original Message --------
Subject: Calculation of Procrustes distances
Date: Fri, 18 Nov 2011 13:55:30 -0500
From: Javier Santos <javiersant...@hotmail.com>
To: <morphmet-requ...@morphometrics.org>
Hello morphometricians,
I am doing an allometric analysis on three species of cichlids and have come
upon a problem. Following Zelditch et al. (2004) I am trying to calculate the
rate of response between shape and my size variable. In the book (pg. 254)
the method used was:
'calculating the the Procrustes distance between each shape and the shape
having the lowest score on the independent variable (i.e. size) we estimate
the rate of response of shape to the independent variable, and can also put
confidence levels to the rate.'
I think I am aware of how to calculate the 'shape having the lowest score on
the independent variable' in IMP software, but I don't know how to calculate
the Procrustes distance. Is there any software that calculates these distances
between shape coordinate data? or an R code?
As well, does anyone know of a simpler way of calculating the rate of
response of shape variation or of any other possible methodology I could
follow?
Thank you all in advance,
Javier Santos Santos
University of Salamanca - Department of Zoology University of Ghent -
Evolutionary Morphology of Vertebrates MNCN-CSIC - Department of
Biodiversity and Evolutionary Biology
+34 648834019
