TITLE:
Effect of Sample Size on the Control Limits of Exponentially Weighted Moving Average Distance Square Scheme
AUTHORS:
Athambawa Mohamed Razmy
KEYWORDS:
Average Run Length, Control Limit, Exponential Weighted Moving Average, Joint Monitoring
JOURNAL NAME:
Open Access Library Journal,
Vol.3 No.6,
June
21,
2016
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.