-------- Original Message --------
Subject: Re: multivariate growth
Date: Wed, 13 Apr 2011 14:43:10 -0400
From: Joseph Kunkel <[email protected]>
To: [email protected]
You might try resistant fit which I remember using from Siegel (1981,
1982). It allows for a conservative set of landmarks such as cranium vs
a growing set such as snout (in developing chimpanzee) and allows you to
fit the resistant set independent from the morphing set. This often
produces a more rational set of embryonic factors to plot as shape
development.
Siegel, A. F. 1981. Geometric data analysis: An interactive graphics
program for shape comparison. Modern Data Analysis, R. L. Launer and A.
F. Siegel eds. Academic Press 103-122.
Siegel, A. F., and R. H. Benson. 1982. A robust comparison of biological
shapes. Biometrics 38:341-350.
Joe
On Apr 13, 2011, at 9:35 AM, morphmet wrote:
-------- Original Message --------
Subject: multivariate growth
Date: Tue, 12 Apr 2011 13:41:04 -0400
From: Fabio de Andrade Machado <[email protected]>
To: [email protected]
Dear all,
I want to investigate ontogenesis of animals with determinate growth
with known ages.
The plot of Procrustes distance from the youngest individual against
age shows a perfect growth growth curve (initial rapid growth followed
by stability around a value).
I was analyzing this through non-parametric correlation between
Procrustes distance and age. I also tried a non-parametric manova
implemented in R on the package "vegan". The results were
qualitatively similar, but I was wondering if there is any
implementation of a multivariate growth model (similar do Bertalanffy)
that is applicable to landmark data.
cheers,
--
Fabio de Andrade Machado
Laboratorio de Herpetologia/Morfometria
Museu de Zoologia da USP
Av. Nazaré, 481, Ipiranga
São Paulo, SP, 04263-000
Brazil
+55 11 61658120
+55 11 82631029
-·. .· ·. .><((((º>·. .· ·. .><((((º>·. .· ·. .><((((º> .··.· >=-
=º}}}}}><
Joseph G. Kunkel, Professor
Biology Department
University of Massachusetts Amherst
Amherst MA 01003
http://www.bio.umass.edu/biology/kunkel/
