-------- Original Message --------
Subject: Procrustes distance
Date: Mon, 3 Nov 2008 04:32:04 -0800 (PST)
From: Rebeca <[EMAIL PROTECTED]>
To: <[email protected]>
Dear Morphometricians,
I am studying shape variation in four populations of fish coming from
different geographical areas using a landmark- based GM approach.
I am doing permutation tests to check for mean shape differences between
the populations using the Procrustes distances, and a question about
these distances came up: Can we tell if a Proc. distance is fairly big
or small by seeing just the numbers? For example, if the distance
between two mean shapes is 0.031, is this a fairly big difference or not?
My question is more like when we describe the variation in the data, we
have a mean and a standard deviation, if the mean is 34.5 cm, and the sd
is 12 cm, I would say, by looking at the numbers that the sd is quite ‘big’.
Considering I am not an expert in morphometrics nor statistics, I hope
someone can help me to understand better this issue!
Thanks in advance,
Rebeca
Rebeca P. Rodriguez Mendoza
Email: [EMAIL PROTECTED]
Marine Research Institute CSIC
– Fisheries Dept.
C/ Eduardo Cabello, 6
Tel. 986 23 19 30 ext. 254
Fax: 986 29 27 62
36 208 Vigo, ESPAÑA
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