Date of Original Version

4-2011

Type

Conference Proceeding

Rights Management

Copyright 2011 by the authors

Abstract or Description

Statistical anomaly detection typically focuses on finding individual data point anomalies. Often the most interesting or unusual things in a data set are not odd individual points, but rather larger scale phenomena that only become apparent when groups of data points are considered. In this paper, we propose two hierarchical probabilistic models for detecting such group anomalies. We evaluate our methods on synthetic data as well as astronomical data from the Sloan Digital Sky Survey. The experimental results show that the proposed models are effective in detecting group anomalies.

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Published In

Journal of Maching Learning Research: Workshops and Conferences, 15, 789-797.