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A new S2 control chart using repetitive sampling |
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| Authors: | Muhammad Aslam Nasrullah Khan Chi-Hyuck Jun |
| Affiliation: | 1. Department of Statistics, Faculty of Sciences, King Abdulaziz University, Jeddah 21551, Saudi Arabia;2. Department of Statistics, National College of Business Administration and Economics, Lahore, Pakistan;3. Department of Industrial and Management Engineering, POSTECH, Pohang 790-784, Republic of Korea |
| Abstract: | A new S2 control chart is presented for monitoring the process variance by utilizing a repetitive sampling scheme. The double control limits called inner and outer control limits are proposed, whose coefficients are determined by considering the average run length (ARL) and the average sample number when the process is in control. The proposed control chart is compared with the existing Shewhart S2 control chart in terms of the ARLs. The result shows that the proposed control chart is more efficient than the existing control chart in detecting the process shift. |
| Keywords: | repetitive sampling control chart average run length process shift |