[Biomod-commits] Help on variable importance

Damien Georges damien.georges2 at gmail.com
Thu Nov 22 09:52:53 CET 2012

Dear Pablo,

As you said, upper a variables importance score is, more effect the 
variable have (for the studied model).
The value returned is dependent from considered algorithm. I am not 
aware of any kind of consensus threshold to determine if a variable must 
be considered as important or not.. And I think it would not be fair to 
do it.

I guess the best, and the safest, way to interpret variables importance 
is to consider them relatively.. You can rank your variables by scores 
and say : for this model, this variable is more important than this other...



On 21/11/2012 21:31, Pablo Riul wrote:
> Dear list,
> Is there any threshold to consider a predictor as an important 
> variable? I understand the importance is the result of one minus the 
> correlation between the original prediction and the prediction with 
> the permuted variable. And higher the value higher the importance. But 
> an reference value would be useful. Does anybody have any suggestion?
> Cheers,
> Pablo Riul
> Departamento de Engenharia e Meio Ambiente
> Centro de Ciências Aplicadas e Educação
> Universidade Federal da Paraíba - Campus IV
> R: Mangueira s/n, Centro CEP: 58.297-000
> Rio Tinto - Paraíba - Brasil
> _______________________________________________
> Biomod-commits mailing list
> Biomod-commits at lists.r-forge.r-project.org
> https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/biomod-commits

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