-------- Original Message --------
Subject: Re: Resistant Fit Procrustes Superimposition
Date: Wed, 8 Jun 2011 12:27:37 -0400
From: Kim van der Linde <[email protected]>
To: [email protected]
CC: morphmet <[email protected]>
I would suggest that solution as well. See Kim van der Linde & David
Houle (2009). Inferring the nature of allometry from geometric data.
Evolutionary Biology: 36(3): 311-322.
http://www.springerlink.com/content/y7x7r34w13330124/fulltext.pdf for
our more extended anal;ysis of the issue.
kim
On 6/2/2011 3:44 PM, morphmet wrote:
-------- Original Message --------
Subject: Re: Resistant Fit Procrustes Superimposition
Date: Thu, 2 Jun 2011 11:27:09 -0400
From: Philipp Mitteröcker <[email protected]>
To: [email protected]
Dear Ruth,
Depending on the assessed structure and the aim of your study, it might
be a solution to superimpose all landmarks just using a subset of
landmarks (in your case probably all landmarks except the problematic one).
Best wishes from Vienna,
Philipp
Am 02.06.2011 um 15:54 schrieb morphmet:
-------- Original Message --------
Subject: Resistant Fit Procrustes Superimposition
Date: Wed, 1 Jun 2011 01:21:37 -0400
From: Ruth Flatscher <[email protected]>
To: [email protected]
Dear all,
I am a botanist working with an object whose landmark distribution is
not ideal, i.e. one single landmark is quite far away from the others.
In addition, based on my observations I assume that this same landmark
is also more variable in its position to the others. Performing an
"ordinary" Least Squares Procrustes fit, I fear I am facing a "Pinocchio
effect". Therefore, I have thought of using Resistant Fit Procrustes
Superimposition. Does anybody of you have experience in it, and is there
any software available which is able to calculate it?
I have also thought of other solutions, like a Procrustes fit omitting
size standardization. Alternatively, I could calculate two
pseudolandmarks on either side of this distant landmark, in order to
make it less isolated from the others. What do you think about these
possibilities?
I would be very glad if somebody could help me out with some suggestions.
Best wishes, and greetings from Vienna,
Ruth
Mag. Ruth Flatscher
Department of Evolutionary and Systematic Botany
Rennweg 14
A-1030 Vienna
email: [email protected] <mailto:[email protected]>
___________________________________
Dr. Philipp Mitteroecker
Department of Theoretical Biology
University of Vienna
Althanstrasse 14
A-1090 Vienna, Austria
Tel: +43 1 4277 56705
Fax: +43 1 4277 9544
email: [email protected]
homepage: http://theoretical.univie.ac.at/people/mitteroecker
--
http://www.kimvdlinde.com
