@article { author = {Fallah nezhad, Mohammad Saber and Shamstabar, Yousof and Vali Siar, Mohammad Mahdi}, title = {Performance of CCC-r control chart with variable sampling intervals}, journal = {Journal of Industrial Engineering and Management Studies}, volume = {4}, number = {2}, pages = {19-34}, year = {2017}, publisher = {Iran Center for Management Studies}, issn = {2476-308X}, eissn = {2476-3098}, doi = {10.22116/jiems.2017.54603}, abstract = {The CCC-r chart is developed based on cumulative count of a conforming (CCC) control chart that considers the cumulative number of items inspected until observing r nonconforming ones. Typically, the samples obtained from the process are analyzed through 100% inspection to exploit the CCC-r chart. However, considering the inspection cost and time would limit its implementation. In this paper, we investigate the performance of CCC-r chart with variable sampling interval (CCC-rVSI chart). The efficiency of CCC-rVSI chart is compared with fixed sampling interval (FSI) scheme of CCC-r chart (CCC-rFSI chart) and CCCVSI chart. The comparison results show that CCC-rVSI chart is more efficient than the CCCVSI chart in reducing the average time to signal (ATS) and also CCC-rVSI chart performs better than CCC-rFSI chart. In addition, some sensitivity analyses are performed to illustrate the effect of the input parameters on the performance of CCC-rVSI chart.}, keywords = {Attribute control chart,variable sampling interval,CCC-r chart,average time to signal}, url = {https://jiems.icms.ac.ir/article_54603.html}, eprint = {https://jiems.icms.ac.ir/article_54603_edb155e008e1930954e1665bfa3d8676.pdf} }