Method determining the extent to which the long-term performance of an industrial process complies with engineering requirements or managerial goals. Often it is required that output should lie between upper and lower specification limits (USL; LSL). One measure of the extent to which this is achieved is the potential capability, Cp, given by , where σ is the standard deviation of the output distribution. An equivalent statistic is Cr, the capability ratio, which is 1/Cp.
Subjects: Probability and Statistics.