[R-sig-Geo] Soil as predictor in SDM

Patrick Schratz patrick.schratz at gmail.com
Wed Sep 27 17:05:36 CEST 2017

Hi Maurizio,

I do not really understand what exactly your problem is.
Getting the soil information stored in a raster file into a data.frame?
General use of factor variables in a model?
I also do not see the link between a factor variable and model bias.

Happy to help after clarification.

Regards, Patrick

On 09/27/2017 04:59 PM, Maurizio Marchi wrote:
> Dear R users,
> I would like to include soil as predictor in my model and in addition to
> climatic variables. Anyway I have some doubts concerning the usd of
> categorical values such as the format of my raster file. Actually, my soil
> type data are categorical codes, should these codes be described as
> categories prior to be used? Or shoul I reclassify my raster into numeric
> values? My main concern is if I would create directional influence and bias
> in the results.
> Thanks

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