One-sided control charts for the mean of positively skewed distributions

Traditional control charts for the mean are based on the normal process assumption. However, in reality there are many situations in which the process populations are non-normal. This paper proposes a new control charting technique for the mean of positively skewed distributions. The charting procedure is described in detail. Some existing robust control charts are reviewed and the properties of these control schemes are compared with the proposed method. A simulation study shows that the proposed control charting method has good robust performance and can detect process shifts efficiently.