Practical Applications of Data Mining

6.6 kNowledge disCovery iN databases 235

6.5.1 Neural Net and Traditional Classifiers

Computational elements or nodes in a neural network form a weighted sum

of N inputs and pass it through a nonlinear function y, as shown in Figure

6.6. In practice, signal values are usually either binary or bipolar. Binary signal

functions take on any values in the unit interval [0, 1]. On the other hand,

bipolar signals are signed values that take on any values in the bipolar interval

[–1, 0]. Both binary and bipolar signals can be transformed into each other by

simple scaling and translation methods. The details of the parameters used in

Figure 6.6 ar ...