Abstract
The coefficient of variation (CV) is a quality characteristic that has several applications in applied statistics and is receiving increasing attention in quality control. A few papers have proposed control charts that monitor this normalized measure of dispersion. This paper suggests a new method to monitor the CV by means of two one-sided EWMA charts of the coefficient of variation squared γ2. Tables are provided for the statistical properties of the EWMA-γ2 when the shift size is deterministic or unknown. An example illustrates the use of these charts on real data gathered from a metal sintering process.
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