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This software has been written by Christiane Weber, based on a paper by Jesse Davis and Mark Goadrich
Jesse Davis and Mark Goadrich. The relationship between Precision-Recall and ROC curves. Proceedings of the 23rd international conference on Machine learning - ICML '06, pages 233-240, 2006. ISSN 14710080. doi: 10.1145/1143844.1143874. URL http://portal.acm.org/citation.cfm?doid=1143844.1143874. 2.3.4, 2.3.4, II