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Subject: Symmetry in MorphoJ
Date: Tue, 26 Jul 2011 06:01:09 -0400
From: J.C. van Rijssel <[email protected]>
To: <[email protected]>
Dear morphometricians,
Regarding the procrustes Anova in MorphoJ, I have a few questions.
1. What does a significant outcome of the term "individual" mean? Does
it mean that there is individual variation between samples in asymmetry?
2. What does a significant outcome of the term "side" mean? Is there
then no symmetry between sides (e.g. left and right)? So are all
individuals grouped together? Can we compare this with a paired t-test?
And if left and right are grouped together, what is than the difference
with a DFA and a procrustes ANOVA?
3. The graphical output of the procrustes Anova shows the one side minus
the other side (left-right). Is there with this analysis accounted for
variation of asymmetry? So in other words, is there accounted for the
fact that sometimes distances between landmarks are larger at one side,
and sometimes at the other side which would equilibrate differences in
asymmetry?
Thanks in advance,
/Jacco C. van Rijssel, PhD student/
Section Integrative Zoology
Institute of Biology Leiden
Leiden University
P.O.Box 9505, 2300 RA LEIDEN
Room number 6.5.14a
The Netherlands
Tel: +31(0)71 5274503
Mobile: +31(0)6 41453003
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Visiting address: Sylvius Laboratory, Sylviusweg 72, 2333 BE Leiden
Website: http://www.science.leidenuniv.nl/index.php/ibl/van_rijssel
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