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The attribute-oriented generalization method compresses the data set by replacing the attribute values with more general information in a form of a concept hierarchy. This procedure assumes that each attribute can be generalized independently of others thus, allowing large data sets to be efficiently generalized (Carter and Hamilton, 1998).A tree structure is used in this method, with the most general concept is placed at the root of the tree while its particulars constitute the leaves (See Fig.2). For example in the Strokes data set, the attribute “Diag” represents the patient diagnostic codes and the attribute “Age” represents the age of patients. In the case of continuous attributes the leaves or nodes in concept hierarchies are represented as a range of values, as shown in Fig.2. The purpose of providing a set of concept hierarchies is to summarize the training data set
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