TITLE:
Outlier Detection Based on Robust Mahalanobis Distance and Its Application
AUTHORS:
Xu Li, Songren Deng, Lifang Li, Yunchuan Jiang
KEYWORDS:
MCD Estimator, Rocke Estimator, Outlier, Mahalanobis Distance
JOURNAL NAME:
Open Journal of Statistics,
Vol.9 No.1,
January
24,
2019
ABSTRACT: Classical Mahalanobis distance is used as a method of detecting outliers,
and is affected by outliers. Some robust Mahalanobis distance is proposed via the fast MCD estimator. However, the bias of the MCD estimator
increases significantly as the dimension increases. In this paper, we propose the
improved Mahalanobis distance based on a more robust Rocke estimator under
high-dimensional data. The results of numerical simulation and empirical
analysis show that our proposed method can better detect the outliers in the
data than the above two methods when there are outliers in the data and the
dimensions of data are very high.