"Munir Mahgub" wrote in message <firstname.lastname@example.org>... > "Greg Heath" <email@example.com> wrote in message <firstname.lastname@example.org>... > > Data = Design + Non-design > > > > Design = Train(estimate weights) + Validation(Stop training when MSEval goes thru a minimum). > > > > Non-design = Test(Obtain UNBIASED generalization estimate of performance on unseen non-design data). > > > > I hope this eliminates a lot of confusion. > > > > Greg > > Thank you for your help. I use nftool > then feeding with input, in mat lab 2009 I have to use training, validation and testing what I need to know what is the purpose of each one ?