WIT Press


Anomalies In Multidimensional Contexts

Price

Free (open access)

Paper DOI

10.2495/DATA090181

Volume

42

Pages

7

Page Range

173 - 179

Published

2009

Size

165 kb

Author(s)

N. Dunstan, I. Despi & C. Watson

Abstract

This paper investigates the problem of presenting anomalies in a multidimensional data set. In such a data set, some dimensions may be merely descriptive, while others represent measures and attribute values used to determine whether the data is anomalous. A data cube of the descriptive dimensions is used as a data structure to partition the data set into subgroups at each node, or context. It is shown that it is possible for a datum to be anomalous in more than one context. Previous work has dealt with this problem by embedding exception indicators in the data cube. Since the data cube is potentially large and anomalies are rare, searching for anomalies is inconvenient. Instead, it is proposed to construct a report for each anomaly that shows its status in each possible context. This results in a direct presentation of anomalous data. Keywords: anomalies, outliers, exception indicators, data cubes, decision support, discovery-driven exploration, knowledge management.

Keywords

anomalies, outliers, exception indicators, data cubes, decision support, discovery-driven exploration, knowledge management.