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process capability index

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越高越好，一般要大于1.33或1.66. Cpk measures how close your manufacturing process is to the centre of the specification limits. A high Cpk value indicates that your manufacturing process is operating close to the centre of the specification limits; a low Cpk value indicates room for improvement. Cpk = min[(Upper Specification Limit – Process Mean), (Process Mean – Lower Specification Limit)] / (3 * Standard Deviation)