R help - Nov 2016 - GAMs: predictions with the number of live traps as an offset variable

Hello,

I built a Generalized Additive Model (GAM) using a negative binomial
distribution (my response variable represents an animal count). In the GAM, I
included the log(trapping effort) as an offset variable to account for
variations in the sampling effort across trapping sites. Trapping effort was
calculated as the total number of live traps per night. Is there a way to fit
the GAM at each raster pixel defining a landscape when the trapping effort in
the pixel is unknown (some landscape areas do not cover the trapping sites)? In
particular, I would like to use the GAM in order to build a predictive map of
abundance.

Thanks a lot for your help.
Nell


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