[R] Modeling presence only data in R

Alejandro González jano at rjb.csic.es
Wed Apr 23 16:07:11 CEST 2008

Dear Milton, you have 2 packages for modelling species distribution in 
R: grasper and Biomod (by Wilfried Thuiller), but they are all 
presence-absence models, so you must generate pseudoabsences for each 
species, following recommendations in papers (see Lobo 2007). On the 
other side, there are free gis tools to perform presence-only models 
(Biomapper, GARP, Openmodeller). Write me if you need if you want some 

Alejandro González Fernández de Castro

Departamento de Biodiversidad y Conservación
Real Jardín Botánico (Consejo Superior de Investigaciones Científicas)

Plaza de Murillo, 2
28014 Madrid - Spain
00 34 91 4203017

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