Control charts have two general uses in an improvement project. Undeniably, the most common application is as a tool to monitor process stability and control. A less common, although some might ...

Key Points An I-MR chart is a control chart used for process stability. It relies on continuous data. They only provide a single view of your current dataset. While some data are social creatures ...

Control charts usually present a graphic display of process stability and/or instability with time, from which the you can determine mean and standard deviation.

Many processes must be monitored by using observations that are correlated. An approach called algorithmic statistical process control can be employed in such situations. This involves fitting an ...

Control chart- a time-ordered plot of sample statistics, used to distinguish between random and nonrandom variability Control limits- the dividing lines between random and nonrandom deviations from ...

Control charts that are properly constructed and maintained prevent false out-of-control signals and provide a useful method for monitoring a process.

Two decades ago, when I was just out of graduate school and working in the automotive industry, I got my first introduction to the statistical process-control chart. We used this laborious ...

Traditional statistical process control charts assume that observations are independent and normally distributed about some mean. We investigate the robustness of traditional charts to data ...