Tree2 - Decision Trees for Tree Structured Data

We present Tree, a new approach to structural classification. This integrated approach induces decision trees that test for pattern occurrence in the inner nodes. It combines state-of-the-art tree mining with sophisticated pruning techniques to find the most discriminative pattern in each node. In contrast to existing methods, Tree uses no heuristics and only a single, statistically well founded parameter has to be chosen by the user. The experiments show that Tree classifiers achieve good accuracies while the induced models are smaller than those of existing approaches, facilitating better comprehensibility.