-------- Original Message --------
Subject: Re: Fluctuating asymmetry analysis
Date: Thu, 26 May 2011 07:16:22 -0400
From: M. Viviana Toro Ibacache <[email protected]>
To: [email protected]
Another thing, Marion.
After you perform a Procrustes ANOVA, you should see if those results
are answering your questions. FA levels comparison requires a bit of
extra steps. I suggest you get in touch with Chris Klingenberg (MorphoJ
creator) for this.
Best,
Vivi
2011/5/26 M. Viviana Toro Ibacache <[email protected]
<mailto:[email protected]>>
Hi Marion,
If I understand correctly, one of the errors was that you didn´t
identify your specimens. FA analysis requires you to have each
specimen identified as well as the source of error (that you say
it's the image, I presume each one with its own set of landmarks),
so the analysis can test for effects, and specifically for the
individual x side effect. I suggest that you include a classifier
with the ID of each specimen, so at the end you should have 2
specimens for each individual category (one from image 1 and one
from image 2).
e.g. Specimen1northIMAGE1
Specimen1northIMAGE2
Your identifier for "individual" should be from "S" to "h", and your
error source "image" from "I" to the number 1 or 2. Geography should
be just "north" After you set your classifiers, you should run a
Procrustes fit, and then Procrustes ANOVA. See how it goes.
Hope this helps!
Vivi
2011/5/26 morphmet <[email protected]
<mailto:[email protected]>>
-------- Original Message --------
Subject: Fluctuating asymmetry analysis
Date: Wed, 25 May 2011 11:46:24 -0400
From: marion chevrinais <[email protected]
<mailto:[email protected]>>
To: [email protected] <mailto:[email protected]>
Hi,
I'm a new to geometric morphometrics analysis and I try to work
on the
fluctuating asymmetry of vole's populations.
For this, I make landmarks and I would use MorphoJ to realise a
procrustes ANOVA. I have some voles to the North of Quebec and
some to
the south I would compare the fluctuating asymmetry of each
population
to characterize the stress which they are subject.
In MorphoJ, I have made the procrustes fit, and after I have
created a
covariance matrice. I have also created some classifiers. One
for the
geographic location I have called "geography", I discriminated
north to
south population. And I created a classifier for the error of
measurements I have called "image", I put 1 or 2 respectively
for the
first image and the replicate.
When I would execute the Procrustes ANOVA, I complete the
classifiers boxes like this :
Individual : from dataset
Side : none (I work with object asymmetry so I do not have any
choice)
Error 1 : image
Additional main effect : geography.
My results are not good, the ANOVA is not the one that I expected.
I do not understand the results for the freedom degrees and for F.
So I would know if there is a kind of "fluctuating asymmetry
analysis
step by step" or anything like that which help me to understand the
MorphoJ program.
Any help is great.
Thanks.
Marion.
--
M. Viviana Toro Ibacache
Universidad de Chile - University of York
--
M. Viviana Toro Ibacache
Universidad de Chile - University of York
