[Biomod-commits] Help on variable importance

[Damien Georges]

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...

Cheers,

Damien.

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
>
>
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