-------- Original Message --------
Subject: RE: Calculation of Procrustes distances
Date: Tue, 22 Nov 2011 14:49:13 -0500
From: Javier Santos <[email protected]>
To: Morphmet <[email protected]>
Thank you all for your answers, I wasn't aware that tpsSmall calculated
the Procrustes distances, and have actually been trying to do them manually!
Thanks again :)
> Date: Tue, 22 Nov 2011 10:38:55 -0500
> From: [email protected]
> To: [email protected]
> Subject: RE: Calculation of Procrustes distances
>
>
>
> -------- Original Message --------
> Subject: RE: Calculation of Procrustes distances
> Date: Mon, 21 Nov 2011 19:46:43 -0500
> From: F. James Rohlf <[email protected]>
> Reply-To: [email protected]
> Organization: Stony Brook University
> To: [email protected]
>
> 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:[email protected]]
> > 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 <[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
>
>
>
