TY - JOUR ID - 3317 TI - An Analytic Variable Limit np Control Chart JO - Scientia Iranica JA - SCI LA - en SN - 1026-3098 AU - Aminnayeri, M. AU - Abooie, M.H. AD - Department of Industrial Engineering,Amirkabir University of Technology Y1 - 2010 PY - 2010 VL - 17 IS - 1 SP - EP - KW - np chart KW - Variable limit KW - Quantity of nonconforming KW - Average Run Length DO - N2 - The Shewhart np control chart is often used to monitor the quantity of nonconforming, but it is slow in detecting small deviations. This paper proposes an efficient approach to monitor the quantity of nonconforming. The novelty of the paper is utilization of an initial belief to construct an analytic variable limit np control chart. The proposed method uses all gathered data, sequentially. This approach is signi cantly faster than some existent e ective approaches in detecting small deviations. These charts are mainly used for evaluation of the initial setup in the process. The simulated results for the average run length profiles demonstrate the superiority of the new approach against the standard np chart, binomial CUSUM, binomial EWMA and moving average approach. UR - https://scientiairanica.sharif.edu/article_3317.html L1 - https://scientiairanica.sharif.edu/article_3317_ce56854bbb87ed70167f42e392938943.pdf ER -