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)* [[alternative HTML version deleted]] _______________________________________________ R-sig-Geo mailing list R-sig-Geo@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-geo