Abstract #300432

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JSM 2003 Abstract #300432
Activity Number: 410
Type: Contributed
Date/Time: Wednesday, August 6, 2003 : 2:00 PM to 3:50 PM
Sponsor: Section on Quality & Productivity
Abstract - #300432
Title: An Economic Model for EWMA and MEWMA Control Charts with In-Control and Out-of-Control Regions
Author(s): Francisco Aparisi*+ and J. Carlos Garcia-Diaz
Companies: Universidad Politecnica De Valencia and Universidad Politecnica De Valencia
Address: Departamento De Estadistica, Valencia, 46020, Spain
Keywords: economic ; quality ; control ; charts ; regions ; genetic
Abstract:

In some industrial applications of quality control charts, it is not relevant to detect small-magnitude shifts, Woodall (1985). Therefore, it is possible to define an in-control region (shifts not to be detected) where ARL has to be maximum, and an out-of-control region (shifts to be detected) where ARL has to be minimum. An economic model, with possible statistical restrictions, for the optimum design of EWMA and MEWMA control charts is introduced, taking into account the previous restrictions and the past process behavior in the in-control region. Genetic algorithms have been used to minimize the average cost. A friendly Windows software has been developed to help the practitioner to use this model.

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