Modeling and analysis of EWMA control schemes with variance-adjusted control limits |
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| Authors: | S. Chandrasekaran J.R. English R.L. Disney |
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| Affiliation: |
a Department of Industrial Engineering, Texas A and M University, College Station, TX, USA
b Department of Industrial Engineering, University of Arkansas, Fayetteville, AR, USA |
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| Abstract: | A stochastic model of the EWMA control chart employing the variance-adjusted control limits is presented. The average run length for various shifts in the process mean is approximated by using a Markov chain approach. Following this, an alternative basis for the design of EWMA schemes is proposed. Computational results are presented and the impact of employing the variance-adjusted control limits on the average run length is investigated. Finally, conditions that permit the use of the asymptotic control limits in place of the variance-adjusted control limits are also identified. |
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