Abbreviations and Notations
 BMU
 Best Matching Unit
 EBIT
 Earnings Before Interests and Taxes
 GIGO
 Garbage In Garbage Out
 GUI
 Graphical User Interface
 HSOM
 Hierarchical SolfOrganizing Map
 KDD
 Knowledge Discovery in Databases
 LVQ
 Learning Vector Quantizer
 MLP
 MultiLayered Perceptron
 PDF
 Probability Density Function
 RKDE
 Reduced Kernel Density Estimation
 ROCE
 Return On Capital Employed
 SOM
 SelfOrganizing Map
 VQ
 Vector Quantization
 VRML
 Virtual Reality Modeling Language

 a vector in the input space

 a sample vector i from the input data set

 reference vector of neuron i

 the bestmatching reference vector of an input vector

 location of neuron i on the map grid

 neighborhood kernel around unit c

 the jneighborhood around unit i

 the Voronoi region around unit i
Juha Vesanto
Tue May 27 12:40:37 EET DST 1997