[R] Neural Net Validation Sub Set

[Prof Brian Ripley]

On Sun, 1 Aug 2004, Matthew Oliver wrote:

> Dear R users,
> I have been playing with the nnet and predict.nnet functions and have two questions.
> 
> 1) Is it possible to specify a validation set as well as a training set
> in the nnet function before using predict.nnet to test the nnet object
> against new data?

No, as nnet just trains.  What would the validation set be for?  
(Validation is testing a fitted model against new data.)

> 2) Is it possible to specify more than one layer of neurons?

Yes.  nnet is a wrapper for other functions, and see how it constructs a 
net -- the construction is general.

-- 
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