[Biomod-commits] create background data for presence-only data

[Robin Engler]

Dear Elaine,

I would suggest to start by reading the Biomod Manual, it contains
explanations on which functions should be used for generating background
pseudo-absences (i.e. artificial absences when no real absences are
available). It will explain how to use the "pseudo.abs()" function.

For general information about different methods to generate pseudo-absences,
simply search for "pseudo-absences" using scholar.google.com, this will
bring-up plenty of papers on the topic.
In particular there is this paper "Assessing the effects of pseudo-absences
on predictive distribution model performance" by Chefaoui and Lobo (2007,
Ecological Modelling) that should be a good start (then you can also look at
the references cited in that paper).

Hope this helps,
have a nice day,

Best,
Robin Engler




On Sat, Jan 16, 2010 at 1:27 AM, elaine kuo <elaine.kuo.tw at gmail.com> wrote:

> Dear,
>
>
> This is Elaine, a postgraduate studying bird distribution in East Asia.
>
> I found your article in Biological Invasion very interesting.
> However, I do not see the modelling procedure quite clearly.
>
> Concerning BIOMOD application, please kindly share your experience about
> how to generate background data for presence-only data.
> (which software and which function)
>
> Thank you very much in advance.
>
>
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