-------- Original Message --------
Subject: Calculation of Procrustes distances
Date: Fri, 18 Nov 2011 13:55:30 -0500
From: Javier Santos <[email protected]>
To: <[email protected]>
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
