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2 Operations Research and Decisions

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On the performance of modified EWMA charts using resampling schemes

Khan N., Yasmin T., Aslam M., Jun C. -H.

Operations Research and Decisions

2018

Vol. 28, No. 3

29--43

Two popular sampling schemes have been used to design control charts by means of a modified exponentially weighted moving average (EWMA) statistic. The structures of the proposed charts, using repetitive group sampling and multiple dependent state sampling, have been presented. The values of average run length have been determined by some specified control chart parameters. The performance of the proposed chart was illustrated via a simulation study. The efficiency of the proposed chart has been compared with the existing one. A practical example based on real data was also given to explain the application of the proposed chart in industry.

An EWMA control chart for the exponential distribution using repetitive sampling plan

Azam M., Aslam M., Jun C. -H.

Operations Research and Decisions

2017

Vol. 27, No. 2

5--19

A new EWMA control chart has been proposed under repetitive sampling when a quantitative characteristic follows the exponential distribution. The properties of the proposed chart, including the average run lengths has been is compared with two existing control charts with the help of simulated data. An application of the proposed chart hs been illustrated using a healthcare data set.