How do you judge when a process is out of control? By plotting a control chart of the output of a process, it is possible to spot special or unnatural causes of variability and indications that the process is drifting. Drifting is defined by the mean or range of the variation changing as the process is running. The most common indication of change is a point falling outside of the control limits, but other tests for process instability are also valuable.
The rules used by Statit for control charts are based on rules described in AT&T’s Statistical Quality Control Handbook and by Lloyd Nelson. Different rules are appropriate for variable data and attribute data. Consequently, the default rules used by Statit vary with the type of chart being produced.
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