Wu, Zhang; Khoo, Michael B.C.; Shu, Lianjie; Jiang, Wei - In: International Journal of Production Economics 121 (2009) 1, pp. 141-147
This article proposes a new np control chart, called the npx chart, that employs an attribute inspection (inspecting whether a unit is conforming or nonconforming) to monitor the mean value of a variable x. The distinctive feature of the npx chart is using the statistical warning limits to...