The proposed Tukey-CUSUM control char
In TCC charting setup the concept of box-plot is used to define the control limits. It is baesd on measures including Q1,Q2,Q3 and IQR the makes TCC structure robust to outliers. In the classical CUSUM setup we generally depend on an idel assumption of normality for an efficient detection. For non-normal (more specifically skewed populations classical CUSUM may not have attractive properties. In such case we need robust structures that have the ability to perform better even for non-normal situations.