Journal of Applied Mathematics
Volume 2013 (2013), Article ID 279203, 5 pages
Research Article

A Robust Control Chart for Monitoring Dispersion

1Science College, Civil Aviation University of China, Tianjin 300300, China
2School of Mathematical Sciences, Nankai University, Tianjin 300071, China

Received 14 April 2013; Accepted 26 June 2013

Academic Editor: Marcelo A. Savi

Copyright © 2013 Maoyuan Zhou and Wei Geng. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Most robust control charts in the literature are for monitoring process location parameters, such as mean or median, rather than process dispersion parameters. This paper develops a new robust control chart by integrating a two-sample nonparametric test into the effective change-point model. Our proposed chart is easy in computation, convenient to use, and very powerful in detecting process dispersion shifts.