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CuSum
Control Limits
The V mask parameters are
calculated as:
Angle ( ):
where 
is the size of the shift in the process mean that the user desires to detect
(i.e. the Amount of Concern,), and k is a scaling factor relating the vertical
scale unit to the horizontal scale unit.
Lead Distance (d):
where 
is the Producer's risk (i.e. a false
alarm) and 
is the Consumer's risk , and
where N is the total number
of observations (= n * m), and  x
is calculated is the sample sigma .
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