On 03/11/2018 22:28, Diego Ardón wrote:
Dear Mr. Soda,
Thank you for replying. Your statement " setting one group’s mean shape
to be the starting shape and the other group’s to the target; this will
lead to the most direct comparison. " pretty much describes what I have
in mind to do. Which software could I use to do this? since I believe
MorphoJ will not do it.
Dear Diego,
MorphoJ will actually do it. The easiest is to use what is under the
menu "Discriminant analysis". MorphoJ's user guide has a brief but very
clear description of the graphical output.
I hope this helps.
Best,
Carmelo
--
==================
Carmelo Fruciano
Institute of Biology
Ecole Normale Superieure - Paris
CNRS
http://www.fruciano.it/research/
El miércoles, 31 de octubre de 2018, 13:51:07 (UTC-6), K. James Soda
escribió:
Dear Mr. Ardón,
Good question. Whenever we make shape comparisons in GM, be that via
displacement vector or deformation grid (which is what you’re
doing), we can typically only compare two shapes at a time. One
shape is called the reference (or starting shape, in this case).
This is the shape for which the grid would look “normal”; straight,
equally spaced grid lines. The second is the target, where the grid
is deformed to take this second configuration. If you want to
compare two geographic groups, I would suggest setting one group’s
mean shape to be the starting shape and the other group’s to the
target; this will lead to the most direct comparison. I am not
certain how easy this is to do in MorphoJ, though.
Hope this helps,
James
On Oct 31, 2018, at 12:01 PM, Diego Ardón <diegoar...@gmail.com
<javascript:>> wrote:
Hello, my name is Diego and I'm currently undertaking a Master's
program in Mexico. One of my thesis project involves a geometric
morphometrics study on the shape of a freshwater fish which
distributes across Central America. I'm currently having trouble
with a concept that will probably be very simple to most of you,
but which I haven't found a way to get my head around.
I'm running a CVA on MorphoJ, dividing my dataset into two
geographically distinct groups. I run the test and change the type
of graph to a "Warped Outline Drawing". So now the graph is
showing a "starting shape" which I interpret as it being the
average of all my landmark data (both geographical groupings),
however I'm not sure on how to interpret the "target shape". I was
expecting to have two "target shapes", one for each of the
geographical groupings. Could someone please help point out my
misunderstanding and offer me a way on how to interpret the
"target shape"?
Thank you, I'll be very thankful
Diego Ardón
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Carmelo Fruciano
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CNRS
http://www.fruciano.it/research/
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