Effect of Sample Size on the Control Limits of Exponentially Weighted Moving Average Distance Square Scheme - Open Access Library Journal

OALibJ > Vol.3 No.6, June 2016

Effect of Sample Size on the Control Limits of Exponentially Weighted Moving Average Distance Square Scheme ()

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DOI: 10.4236/oalib.1102663 1,052 Downloads 2,745 Views Citations

Author(s)

Athambawa Mohamed Razmy

Affiliation(s)

Department of Mathematics and Statistics, Sultan Qaboos University, Muscat, Oman.

ABSTRACT

In the series of quality monitoring schemes with exponentially weighted moving average, the exponentially weighted moving average distance square scheme was introduced for joint monitoring of process mean and variance. This scheme claims that it has a special feature that the control limits of the scheme are independent of sample size and therefore it gives more freedom to the users. However, this claim was not studied in detail. In this study, the control limits were found for this scheme through simulations, for different sample sizes with different combination of other scheme parameters. This study concludes that the control limits for designing this scheme are independent of sample size.

KEYWORDS

Average Run Length, Control Limit, Exponential Weighted Moving Average, Joint Monitoring

Share and Cite:

Razmy, A. (2016) Effect of Sample Size on the Control Limits of Exponentially Weighted Moving Average Distance Square Scheme. Open Access Library Journal, 3, 1-7. doi: 10.4236/oalib.1102663.

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