Re: UPGMA: Euclidean and Procrustes distances

Sat, 17 Nov 2012 22:41:46 -0800


----- Forwarded message from Philipp Mitteröcker -----

Date: Fri, 16 Nov 2012 11:18:49 -0500
From: Philipp Mitteröcker
Reply-To: Philipp Mitteröcker
Subject: Re: UPGMA: Euclidean and Procrustes distances
To: [email protected]

Euclidean distances are equal to Procrustes distances in tangent space, so they are close enough to the original Procrustes distances.

Best,

Philipp 




Am 15.11.2012 um 20:32 schrieb [email protected]:


----- Forwarded message from Rodrigo Lima -----

Date: Thu, 15 Nov 2012 12:21:28 -0500
From: Rodrigo Lima 
Reply-To: Rodrigo Lima 
Subject: UPGMA: Euclidean and Procrustes distances
To: "[email protected]" 

Dear morphometricians,

I would greatly appreciate your input on this matter:

The context: I am studying 9 populations of a small rodent species and I wanted to represent morphological relationships between populations using a UPGMA cluster analysis.

The problem:  I used the mean population shapes (Procrustes coordinates) to do this analysis in PAST using Euclidean distances and got a nice tree with bootstrap values, but there is no option for using Procrustes distances in this package. I get the same topology using Procrustes distances with R, but I can’t get the bootstrap values on the nodes of the tree.

The questions:
1 - Are UPGMA analyses using Euclidean distances and Procrustes distances equivalent?
2 - Is there any package in which I could simply enter the Procrustes distances and get a UPGMA tree with bootstrap values?

Thank you in advance,
Rodrigo


----- End forwarded message -----





___________________________________

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



----- End forwarded message -----



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