-------- Original Message --------
Subject: Re: Fluctuating asymmetry analysis
Date: Thu, 26 May 2011 06:55:38 -0400
From: M. Viviana Toro Ibacache <[email protected]>
To: [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
