[R-sig-Geo] Collinearity test domain

[Maurizio Marchi]

Hallo everybody,
I have a question about Ecological Niche Modelling / Species Distribution
Modelling.

If I want to study the distribution of a species in present and future
time, to remove redundancy and collinearity between predictors should I
test predictors' correlation/covariance/collinearity using a database
including only presence/absence available points or should I have to use
the whole region I'm studing (e.g. the whole Europe?)

as example:
Presence points: Forest national inventory surveys classified as "pinus
nigra stands"
Absence/Pseudo absence points: Forest national inventory surveys NOT
classified as "pinus nigra stands"
Study region: Italy

many thanks,
Maurizio

-- 
Maurizio Marchi, Ph.D. student
Florence, Italy
ID skype: maurizioxyz
Ubuntu 14.04 LTS
linux user 552742

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