[R] Variables selection in Neural Networks
Matthew Barber
c__programming at hotmail.com
Sun Apr 27 11:15:06 CEST 2008
Hi Fede,
You would have to eliminate the variables less correlated with the response
variable. And for the explanatory variables to choose those that are very
correlated to each other. I don't know if exists some function of R that
does this by you.
Mathew Barber
_Fede_ wrote:
>
> Hi folks,
>
> I want to apply a neural network to a data set to classify the
> observations in the different classes from a concrete response variable.
> The idea is to prove different models from network modifying the number of
> neurons of the hidden layer to control overfitting. But, to select the
> best model how I can choose the relevant variables? How I can eliminate
> those that are not significant for the model of neural networks? How I can
> do this in R? I do this:
>
> dataset.nn=nnet(response.variable~., dataset, subset = training, size=1,
> decay=0.001, linout=F, skip=T, maxit=200, Hess=T)
>
> What I am doing is to vary size between 0 and 1 since with a single layer
> it can learn any type of function or continuous relation between a group
> of input and output variables. But this only would give me two different
> models. The ideal would be to reduce the model eliminating nonsignifictive
> variables. How I can prove other different models?
>
> Regards.
>
> _Fede_
>
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