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:: Home ::Six Sigma ::SIX SIGMA GLOSSARY: Average Run Length (ARL) :: CURRENT STUDENTS LOGIN

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Average Run Length (ARL)
 

The Average Run Length is the number of points that, on average, will be plotted on a control chart before an out of control condition is indicated (for example a point plotting outside the control limits).

If the process is in control:

If the process is out of control:

Where α is the probability of a Type I error and β the probability of a Type II error.

For an overview of this topic see the Statistical Process Control entry.

 

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