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Journal article
An EWMA Quality Control Procedure for Jointly Monitoring the Mean and Variance
The International journal of quality & reliability management, Vol.10(7), p.58
11/01/1993
Abstract
The usual practice in using a control chart to monitor a process is to take samples at fixedlength sampling intervals from the process. A statistic computed from the sample is plotted on a chart with two control limits. Any point outside the control limits is taken as an indication that the process may have changed. A control scheme in which the sampling intervals are allowed to vary depending on what is being observed in the data is referred to as a variable sampling interval control scheme. Proposes an exponentially weighted moving average EWMA control procedure with variable sampling intervals for monitoring the process mean and standard deviation. Shows that the proposed control scheme is considerably more sensitive in detecting changes in the process mean andor process standard deviation than its corresponding fixed sampling interval scheme.
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Details
- Title
- An EWMA Quality Control Procedure for Jointly Monitoring the Mean and Variance
- Publication Details
- The International journal of quality & reliability management, Vol.10(7), p.58
- Resource Type
- Journal article
- Publisher
- MCB UP Ltd
- Copyright
- © 1993, Emerald Group Publishing Limited
- Identifiers
- 99380553393806600
- Academic Unit
- Hal Marcus College of Science and Engineering ; Mathematics and Statistics
- Language
- English