A control chart plots measured values along with upper ... Although many statisticians use three standard deviations from the average to construct these limits, Donald Wheeler, recipient of ...

These are typically captured using a control chart -- a statistical tool used in manufacturing or business to show the extent of the variation in a process. Control charts usually present a ...

The endophthalmitis data between 01/07/97 and 30/06/07 (10 years) at the Royal Gwent Hospital were analysed using the control chart method. Certain criteria related to the control chart were ...