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...train,size=4,linout=FALSE,decay=0.025,maxit=800) It works well and give me ROC 0.85. However, when I want to reproduce the result in java, I cannot get the same prediction as nnet output. I checked modern applied statistics with S and I think the output is as follows: y=sigmoid(a_0+\sum (w_{hk} sigmoid_h(a_h+\sum (w_{ih}*x_i)))) and this is exactly how I reproduce the result, the activation function is logistic function for hidden layer and output layer. I use the exact weights I get from the model. Will anyone be kind of pointing out where thing goes wrong? Thanks Eric -- View this message i...