Dear list,
To build a species distribution models with biomod2 package, I have a
Spatial Points Data Frame with approximately 1500 presence points and more
than 100000 absence points (forest inventory of Tuscany). Considering that
using all my dataset I have very different predictions than using the same
number of presence and absence (subset of the absence points, extracting
randomly 1500 points) what should I do? Should presence/absence ratio be
closer to 1 or not?

Thanks,


-- 
Maurizio Marchi, Phd student
CRA-SEL (Arezzo, Italy)
skype: maurizioxyz
*Ubuntu 12.04 (Precise Pangolin)*

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