----- Forwarded message from
morphmet_modera...@morphometrics.org -----
Date: Mon, 29 Oct 2012
22:28:59 -0700
From: morphmet_modera...@morphometrics.org
Reply-To: morphmet_modera...@morphometrics.org
Subject: RE: Ontogentic
shape comparison
To: morphmet@morphometrics.org
----- Forwarded message from Murat
Maga
Date: Mon, 29 Oct 2012 18:39:08 -0400
From: Murat Maga
Reply-To: Murat Maga
Subject: RE: Ontogentic shape comparison
To:
morphmet@morphometrics.org
I have a somewhat
related question. Let’s say I have an ontological series and interested in
visualizing the form change due to growth, as well as the shape change. In such
case which one would be the better approach:
1.
Do GPA
without scaling for form change visualization, then regress the PCs against size
and use the residuals to visualize shape changes independent of
size.
2.
Do two
separate GPAs (with and without scaling) and conduct PCs
accordingly.
Thanks,
M
From:
morphmet_modera...@morphometrics.org
[mailto:morphmet_modera...@morphometrics.org]
Sent: Monday, October
29, 2012 12:53 AM
To: morphmet@morphometrics.org
Subject:
RE: Ontogentic shape comparison
----- Forwarded message from Javier
Santos -----
Date: Fri, 26 Oct 2012 08:14:23 -0400
From: Javier Santos
Reply-To: Javier Santos
Subject: RE: Ontogentic shape comparison
To:
Morphmet
Hello
Carmelo,
I think I was too focused on the PCA graphs. Both the
methods you mention are useful for what I was thinking about, although I prefer
the images of MorphoJ over those of the older tps series. Thanks for the
response!
Cheers,
Javier
Santos
> From: morphmet_modera...@morphometrics.org
>
To: morphmet@morphometrics.org
>
Subject: Re: Ontogentic shape comparison
> Date: Thu, 25 Oct 2012 13:05:45
-0700
>
>
> ----- Forwarded message from Carmelo Fruciano
-----
>
> Date: Thu, 25 Oct 2012 10:07:57 -0400
> From:
Carmelo Fruciano
> Reply-To: Carmelo Fruciano
> Subject: Re:
Ontogentic shape comparison
> To: morphmet@morphometrics.org
>
> morphmet_modera...@morphometrics.org
ha scritto:
>
> >
> > ----- Forwarded message from
"SANTOS SANTOS, JAVIER" -----
> >
> > Date: Wed, 24 Oct 2012
12:43:23 -0400
> > From: "SANTOS SANTOS, JAVIER"
> > Reply-To:
"SANTOS SANTOS, JAVIER"
> > Subject: Ontogentic shape
comparison
> > To: morphmet_modera...@morphometrics.org
>
>
> > Hello morphometricians,
> >
> > I am
comparing ontogenetic shapes in two species of Lake Victoria
> >
cichlids in MorphoJ (2D). I want to compare shape differences at each
>
> ontogenetic stage. My question lies in what would be the better
option
> > to compare the shapes visually (so for a illustration), and
I would
> > like to know which of these two options you think is best
to do so:
> > (1) Do a PCA in MorphoJ for each species at a given
ontogenetic stage.
> > Then compare the consensus configuration for
each. Or (2) Do the same
> > PCA and then compare both shapes at a
determined scale factor (i.e.
> > 0.1). Or (3) Do a combined PCA and
then compare the shapes obtained
> > with a negative scale factor
(where one species is located) and with a
> > positive scale factor
(where the other species is located).
> > Thanks in advance for your
advice.
> >
>
> Dear Javier,
> I'm not sure I
understand. Do you want to plot at each stage the
> difference between
the two species as a shape change?
> You could do a Generalized Procustes
Analysis of everything together,
> then compute mean Procustes residuals
for each stage of each species
> and finally produce deformation grids
between pairs of interest (for
> example in tpsSplin, if I remember).
> Another way to do it could be, after the GPA, just use the
>
discriminant function routine in the program to get the graph for the
>
difference in mean shape between the relevant pairs.
>
> If you,
instead, use the PCA module in the program you will get, as
> far as I
know, only shape changes associated with a certain PCA while,
> as far as
I can tell, you wanna plot shape changes between species
> spanning all
the dimensions (not only the first PC).
> I hope this helps,
>
Carmelo
>
> --
> Carmelo Fruciano
> Post-doc -
University of Konstanz - Konstanz, Germany
> Honorary Fellow - University
of Catania - Catania, Italy
> e-mail c.fruci...@unict.it
> http://www.fruciano.it/research/
>
> ----- End forwarded message -----
>
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