A measure of the capability of a process to produce output within the specifications. The measurement is made without regard to the centering of the process.
Where σ is estimated from a within-subgroup estimate. Cpk A measure of the capability of the process to produce
output within the specifications. The centering of the process is taken into consideration by looking at the minimum of the upper specification limit capability ( puC (USL ) 3x= − σ ) and the lower specification limit
capability ( plC ( LSL) 3x= − σ ); Cpk = min(Cpu, Cpl). Where σ is estimated from a within-subgroup estimate.
CUSUM A control chart designed to detect small process shifts by looking at the CUmulative SUMs of the deviations of successive samples from a target value.
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