A control chart consists of several parts. It has two control limits and an average line. The bottom dashed line is called ...

On a Shewhart chart, upper and lower control limits are used to decide whether a point signals an out-of-control condition. On a cusum chart, the limits take the form of a decision interval or a ...

Three sigma limits set the upper and lower control limits in statistical quality control charts. Data above the average and beyond the three sigma line on a bell curve represent less than 1% of ...

The variables _LCLX_ and _UCLX_ are assigned lower limits of zero for the cusums, and the variables _MEAN_ and _S_ are assigned dummy values. Now, TABBOTH has the structure required for a TABLE= data ...