Discriminant Functions for Multiple Groups
When there are more than two groups, then we can estimate more than one discriminant function like the one presented above.
Discriminant functions
Classifiers come in a great diversity of techniques and algorithms. Yet, the ways the decision regions and decision boundaries are determined share a common pattern : ...
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For example, a network with a single linear output can solve a two-class problem by learning a discriminant function which is greater than zero for one class, and less than zero for the other. Fig.
Fisher published the data on Iris setosa and Iris versicolor to demonstrate the use of discriminant functions.
 See also: Regression, Distribution, Classification, Data mining, Estimation
  
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