This is the `S-news' mailing list. Could you kindly explain what your
question has to do with S or S-PLUS? (You have not mentioned whether you
did your work in S-PLUS, and if you did, how you did it, etc.)
Andy
> From: Augusto Cesar H. Dantas
>
> Dear S-plus users,
>
> I have designed a simple backpropagation neural network
> to perform
> time series prediction, that is, inputs x(t), x(t-1),...,
> x(t-N+1) must
> produce x(t+1) in the output. Training converges, but when I
> pass the test
> set through the network, the output is delayed by one sample
> (that is,
> the output follows x(t) and not (x(t+1)). Also surprising is the fact
> that, when I train a network to generate x(t+1) and x(t+2),
> both outputs
> follow x(t). This behavior is valid only for the test set;
> the training
> and validation sets are correctly mapped.
> Has anyone seen this before? Any help would be truly welcome!
>
> Regards,
>
> Augusto.
>
> --
> Augusto Cesar Heluy Dantas
> D.Sc. Student at COPPE/UFRJ
> Rio de Janeiro, Brazil
>
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