JSM Preliminary Online Program
This is the preliminary program for the 2007 Joint Statistical Meetings in Salt Lake City, Utah.

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Activity Number: 403
Type: Invited
Date/Time: Wednesday, August 1, 2007 : 10:30 AM to 12:20 PM
Sponsor: Section on Quality and Productivity
Abstract - #307925
Title: A Control Chart for the Coefficient of Variation
Author(s): Chang W. Kang*+ and Man S. Lee and Young J. Seong and Douglas M. Hawkins
Companies: Hanyang University and LG Philips LCD and Gyenggi Research Institute and The University of Minnesota
Address: 1271 Sa-1-dong, Sangnok-ku, Ansan, 426-791, South Korea
Keywords: : Statistical process control ; process variability ; clinical chemistry
Abstract:

Monitoring variability is a vital part of modern statistical process control. The conventional Shewhart R and S charts address the setting where the in-control process readings have a constant variance. In some settings, however, it is the coefficient of variation, rather than the variance, that should be constant. For example this setting is common in clinical chemistry, and then conventional R and S charts cannot be used. This paper develops a chart, equivalent to the S chart, for monitoring the coefficient of variation using rational groups of observations.

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Revised September, 2007