Browsing by Author "Garcia, Nuno Ricardo da Cruz"
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- Social Network Analysis for Insurance Fraud DetectionPublication . Garcia, Nuno Ricardo da Cruz; Proença, Hugo Pedro Martins CarriçoFraud detection configures a very interesting problem yet to solve, particularly when related to automobile insurance claims. In this research we address this challenge from a not so typical "record" perspective of data, but rather from a network point of view, where relations between entities involved in claims are explored to detect organized fraud structures. First we propose a random data generator, able to generate graphs that resemble realistic patterns evidenced on authentic scenarios, based on insurance authorities statistics and graph features already described in the literature. We show how this graph copes with the requirements on every single step, and how it can be adjustable to different locals. Secondly, we propose a variation of Subelj approach [ŠFB11], and apply it to the generated graphs. This approach explores the relations between entities, takes advantage of the power of social network analysis metrics and statistical methods such as RIDIT scores and Principal Component Analysis to score each connected component and Support Vector Machines to classify them either fraudulent or honest. The main contributions of this research is a new approach to generate data regarding automobile insurance claims suitable for social network analysis, and a variation of an approach described on the literature, proving thus not only benchmark results but also new insights regarding fraud detection through graph-based algorithms.