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Article type: Research Article
Authors: Humphrey, Matt; * | Cunningham, Sally Jo; 1 | Witten, Ian H.; 2
Affiliations: Department of Computer Science, University of Waikato, Hamilton, New Zealand
Correspondence: [*] Corresponding author. E-mail: matth@cs.waikato.ac.nz.
Note: [1] E-mail: sallyjo@cs.waikato.ac.nz.
Note: [2] E-mail: ihw@cs.waikato.ac.nz.
Abstract: Researchers in machine learning primarily use decision trees, production rules, and decision graphs for visualizing classification data, with the graphic form in which a structure is portrayed as having a strong influence on comprehensibility. We analyze the questions that, in our experience, end users of machine learning tend to ask of the structures inferred from their empirical data. By mapping these questions onto visualization tasks, we have created new graphical representations that show the flow of examples through a decision structure. These knowledge visualization techniques are particularly appropriate in helping to answer the questions that users typically ask, and we describe their use in discovering new properties of a data set. In the case of decision trees, an automated software tool has been developed to construct the visualizations.
Keywords: Knowledge representation, Decision tree, Decision graph, Graphical visualization
DOI: 10.3233/IDA-1998-2406
Journal: Intelligent Data Analysis, vol. 2, no. 4, pp. 333-347, 1998
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