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lower control limit

   Also found in: Acronyms 0.01 sec.
lower control limit [¦lō·ər kən′trōl ‚lim·ət]
(industrial engineering)
The horizontal line drawn on a control chart at a specified distance below the central line; points plotted below the lower control limit indicate that the process may be out of control.


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49) For example, Figure 1 illustrates TNMCM performance (large solid black line), with upper and lower control limits (represented by the solid red lines), at Dover Air Force Base (AFB) during calendar year 2006.
Additionally upper and lower control limits can be calculated and plotted.
When using DPMO values, the center line, upper and lower control limits can be calculated: Center line = dpmo* = average of the dpmo values Control limits = dpmo* +/- 300 [square root of (dpmo*/n.
 
 
 
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