[Biomod-commits] Yweights and Projections

Martin Videla videla.martin at gmail.com
Tue Jul 17 17:33:56 CEST 2012

Hi Biomodellers!

I have a few questions:

1) I’m trying to use the Yweight function to weight presence points
according their georreferencing accuracy. I have these data for presence
points but obviously not for pseudoabsences so I guess this is causing a
problem when I run the models. This is the error message

Error in `[.data.frame`(tr, , 4) : undefined columns selected

So my question is how can I incorporate the georreferencing accuracy when
using pseudoabsences?

2) I run the models successfully and then I projected them using the
Projection.raster function to a large region (Latin America). The resulting
maps predict far more presences than expected. When I perform the
projection of the exact same model to a smaller area (Central America)
within the range of the species the maps look very different (better)! Does
anyone know what could be the reason for such variation?

Thank you!


Martín Videla
Centro de Investigaciones Entomológicas de Córdoba (CIEC)
Faculdad de Ciencias Exactas,Fisicas y Naturales (FCEFyN)
Universidad Nacional de Córdoba (UNC)
Velez Sarfield 299, CP: 5000, Córdoba, Argentina
TE: 0054351-4332090 int 43
e-mail: videla.martin at gmail.com
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