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Presents a study which looks at a general index of social, economic, and political threat in Europe and Belgium for 1920 to 1997. Characteristics of threat index; Detailed information on the methodology used to conduct the study; Discussion based on the results of the study.

Decision trees have proved to be valuable tools for the description, classification and generalization of data. Work on constructing decision trees from data exists in multiple disciplines such as statistics, pattern recognition, decision theory, signal processing, machine learning and artificial neural networks. Researchers in these disciplines, sometimes working on quite different problems, identified similar issues and heuristics for decision tree construction. This paper surveys existing work on decision tree construction, attempting to identify the important issues involved, directions the work has taken and the current state of the art. [ABSTRACT FROM AUTHOR]