Re: [R] Akaike or BIC criteria for feed-forward neural nets

From: Prof Brian Ripley <ripley_at_stats.ox.ac.uk>
Date: Thu, 03 Jul 2008 12:33:27 +0100 (BST)

On Mon, 30 Jun 2008, J. Miguel Marin wrote:

> Hello all,
>
> I would like to know whether there exists any way to calculate the AIC or the
> BIC criteria for a nnet object (not only in the multinomial case).
> Commands like stepAIC, AIC or extractAIC do not work with a feed forward
> neural net and I cannot find any command that deals with nnet objects.

They are not defined for most nnet fits -- they need a maximized likelihood, and no neural-net fitting package gives you that.

>
> Best
>
> jm~
>
> _______________________________
>
> J. Miguel Marin
>
> http://www.est.uc3m.es/jmmarin
>
> Dep. of Statistics
> University Carlos III of Madrid
> Spain (E.U.)
>
> ______________________________________________
> R-help_at_r-project.org mailing list
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>

-- 
Brian D. Ripley,                  ripley_at_stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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Received on Thu 03 Jul 2008 - 11:40:26 GMT

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