Dear List,

I am trying to predict species distributions using MADIFA (Calenge et al.
2008).
However, the codes (Monte Carlo simulation) are not familiar to me,
and they seem unavailable in package adehabitat.
(similar to the response from the authors)

Please kindly help and thank you in advance.

Elaine

In this paper, it says that

1. At  each  step  of  the  process,  we  simulated  a
random  habitat  use  by  the  chamois  by  generating  a
uniform distribution of 400 points over the study area.

=> Please kindly suggest any code or package that can perform the
randomization.


2.  We repeated this simulation
500 times to derive a distribution of eigenvalues under
the  hypothesis  of  random  habitat  use.

=> Please kindly suggest any code or package that can perform the
repetition.


3. We  finally
compared the first eigenvalue of the MADIFA of the
observed 400 chamois groups to this simulated distri-
bution to derive a P value.

=> Is this a chi-square test ? Or any other suitable tests ?

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