Economic-statistical design of 2-of-2 and 2-of-3 runs rule scheme
Article first published online: 5 AUG 2008
Copyright © 2008 John Wiley & Sons, Ltd.
Quality and Reliability Engineering International
Volume 25, Issue 2, pages 215–228, March 2009
How to Cite
Kim, Y.-B., Hong, J.-S. and Lie, C.-H. (2009), Economic-statistical design of 2-of-2 and 2-of-3 runs rule scheme. Qual. Reliab. Engng. Int., 25: 215–228. doi: 10.1002/qre.963
- Issue published online: 6 FEB 2009
- Article first published online: 5 AUG 2008
- economic-statistical design;
- average run length;
- average time to signal;
- runs rule;
- Markov chain approach
In this paper, we investigate the economic-statistical design method for the 2-of-2 runs rule and the 2-of-3 runs rule. The Markov chain approach is used to obtain the average run length and the process cycle time. In addition, a simplified algorithm is presented to search the optimal setting of the design parameters. A numerical example and sensitivity analysis are also provided to compare the performances of the runs rules. The results show that the use of runs rule scheme can reduce operating cost comparing with the Shewhart control chart while maintaining a good statistical performance. Copyright © 2008 John Wiley & Sons, Ltd.