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Sigma to DPMO to Yield to Cpk Table: Take Control of Your Data
To convert to short-term Z, which is the Sigma level, use the following formula: Z(short term) = Z(long term) + 1.5 Then you can determine Cpk using the following formula: Cpk = Z(short-term) / 3 ...
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How to Set and Use Control Limits to Improve Your Process Performance
They are placed +/-3 sigma away from the average line ... and the average length of the five parts are part of the control limit formula. The range represents within and the average between ...