Detecting anomalies in graphs with numeric labels

  • Authors:
  • Michael Davis;Weiru Liu;Paul Miller;George Redpath

  • Affiliations:
  • Queen's University, Belfast (QUB), Belfast, United Kingdom;Queen's University, Belfast (QUB), Belfast, United Kingdom;Queen's University, Belfast (QUB), Belfast, United Kingdom;CEM Systems, Belfast, United Kingdom

  • Venue:
  • Proceedings of the 20th ACM international conference on Information and knowledge management
  • Year:
  • 2011

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Abstract

This paper presents Yagada, an algorithm to search labelled graphs for anomalies using both structural data and numeric attributes. Yagada is explained using several security-related examples and validated with experiments on a physical Access Control database. Quantitative analysis shows that in the upper range of anomaly thresholds, Yagada detects twice as many anomalies as the best-performing numeric discretization algorithm. Qualitative evaluation shows that the detected anomalies are meaningful, representing a combination of structural irregularities and numerical outliers.