Hi Clement,

I'm using the gnesfa approach to understand octopus distribution in the
Mediterranean Sea and Atlantic Ocean.

I have read the madifa and gnesfa papers and (of course) I have some doubts,
mainly practical details.

In the Gnesfa paper, when you explain the examples and compare the
eigenvalues of the 3 analysis, you mentioned a significance test for the
eigenvalues. For example, at the end of page 680: "Indeed, the tests of the
first (γ1 = 1.61, P<0.002) and of the last eigenvalue (γ6 = 0.53, P<0.002)
were both significant." I don't know if I miss it (I'm sorry if I did!!),
but I don't know where did you get those tests from? Are they implemented in
adehabitat too?

Another thing, in the MADIFA paper -Calenge et al (2008)-, you tested the
habitat selection value (θ1 = 3.7, P< 0.002, pag 561) with a Monte Carlo
test. Is it like the renfa function? Again, can I find it in adehabitat?

Regarding the goodness of fit you used, is it implemented in adehabitat? The
Fig.4 of that paper reminds me AUC plots, are they equivalent?

Just two last details... In Calenge et al (2008) you mentioned the inertia
ratio, but I'm not sure where I can find it in the output of madifa/fanter?
And about enfa, the output gives the global marginality, but, where can I
find the global specialization or global tolerance?

Thank you very much!!

Consuelo

-------------
Consuelo Hermosilla
PhD student
Departamento de Ecología y Biología Animal
Departamento de Bioquímica, Genética e Inmunología, Área de Genética
Facultad de Ciencias del Mar
Campus de As Lagoas-Marcosende
Universidad de Vigo
36310 Vigo
SPAIN
Mobile: +34 692 633 298

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---------- Forwarded message ----------
From: Consuelo Hermosilla <cheluna@gmail.com>
Date: Sun, May 30, 2010 at 8:05 PM
Subject: gnesfa details
To: calenge@biomserv.univ-lyon1.fr


Hi Clement,

I wasn't sure if I should post these questions in the R-Sig-Geo forum, but
if you want, I can do it. As part of my thesis, I'm using the gnesfa
analysis you have developed to understand octopus distribution in the
Mediterranean Sea and Atlantic Ocean.
I have read the madifa and gnesfa papers and (of course) I have some doubts,
mainly practical details. I hope you have some time to help me.
In the Gnesfa paper, when you explain the examples and compare the
eigenvalues of the 3 analysis, you mentioned a significance test for the
eigenvalues. For example, at the end of page 680: "Indeed, the tests of the
first (γ1 = 1.61, P<0.002) and of the last eigenvalue (γ6 = 0.53, P<0.002)
were both significant." I don't know if I miss it (I'm sorry if I did!!),
but I don't know where did you get those tests from? I know how to obtain
the eigenvalues, but not these tests.... Is implemented in adehabitat too?
Another thing, in the MADIFA paper -Calenge et al (2008)-, you tested the
habitat selection value (θ1 = 3.7, P< 0.002, pag 561) with a Monte Carlo
test. Is it like the renfa function? Again, can I find it in adehabitat?
One last thing, the goodness of fit you used, is not implemented in
adehabitat, isn't it? The Fig.4 reminds me AUC plots, are they equivalent?

I thank you very much in advance,

Consuelo

-------------
Consuelo Hermosilla
PhD student
Departamento de Ecología y Biología Animal
Departamento de Bioquímica, Genética e Inmunología, Área de Genética
Facultad de Ciencias del Mar
Campus de As Lagoas-Marcosende
Universidad de Vigo
36310 Vigo
SPAIN
Mobile: +34 692 633 298

oooO
(     ) Oooo
   (   (     )
  _)    )  /
        (_/

Stop Gaza Massacre

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