Sharif University of Technology Scientia Iranica 1026-3098 17 1 2010 06 01 An Analytic Variable Limit np Control Chart 3317 EN M. Aminnayeri Department of Industrial Engineering,Amirkabir University of Technology M.H. Abooie Department of Industrial Engineering,Amirkabir University of Technology Journal Article 2010 07 21 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 eective 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. https://scientiairanica.sharif.edu/article_3317_ce56854bbb87ed70167f42e392938943.pdf