Ariadne Schulz <ariadne.sch...@gmail.com> ha scritto:
Hello All,
I have another rather silly question that I'm hoping either has a very
simple answer or will set off another wave of debate. I'm still on about my
3D semilandmarks and now I want to plot them in form space in R. I have my
original landmarks and my GPA coordinates and centroid size from gpagen
with a sliding function, and so forth so the new version of plotAllometry
should work, but I really want to plot in form space. It seems to me I'm
just missing something really easy. Is there a way to do this?
Dear Ari,
if you are referring to plots of principal components/relative warps
in "size-shape space", as defined by Mitteroecker et al 2004 (Journal
of Human Evolution), it is basically a PCA on Procrustes coordinates +
log centroid size. Reading of the original paper is also useful to
understand the idea and its application.
I don't know if this approach is implemented "out of the box" in some
R package but, given its simplicity, it's easily obtained referring to
the original publication by using even basic R function or other
general-purpose statistical software.
You can see an example of these plots in one of my own papers
(Fruciano et al 2012 - Environmental Biology of Fishes) and, really,
in many others, where it is used to produce exploratory plots.
I hope this helps.
Best,
Carmelo
--
Carmelo Fruciano
Postdoctoral Fellow - Queensland University of Technology - Brisbane,
Australia
Honorary Fellow - University of Catania - Catania, Italy
e-mail c.fruci...@unict.it
http://www.fruciano.it/research/
--
MORPHMET may be accessed via its webpage at http://www.morphometrics.org
---
You received this message because you are subscribed to the Google Groups "MORPHMET" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to morphmet+unsubscr...@morphometrics.org.
