Abstract #300318

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JSM 2003 Abstract #300318
Activity Number: 410
Type: Contributed
Date/Time: Wednesday, August 6, 2003 : 2:00 PM to 3:50 PM
Sponsor: Section on Quality & Productivity
Abstract - #300318
Title: Multivariate CUSUM and EWMA Control Charts for Variability
Author(s): Raid W. Amin*+
Companies: University of West Florida
Address: Bldg. 38, Pensacola, FL, 32514-5732,
Keywords: multivariate control charts ; EWMA control charts ; CUSUM control charts ; process variability
Abstract:

There are few publications presenting material on the Average Run Length properties of control charts for monitoring the variability of a continuous process. The few listings in the literature focus on Shewhart-type control charts, which are known to lack power for small and moderate sized changes in the process variance. Most articles focus on increases in variability and they do not cover decreases. This paper presents new results based on extensions of existing control charts to the EWMA and CUSUM charts. The ARL results show that our proposed charts are far more powerful in detecting increases and decreases in the process variance.

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