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**PPM&SIGMA換算公式(createdby:IfenChiang)*PPM換算Sigma,Cpk&PpkPPMZSigmaCpkCp60004.0121443284.01.341.782005.0400837995.01.682.243.45.999854476.02.002.67*Sigma換算PPM,Cpk&PpkSigmaYIELDRATEPPMCpkCp7.50.9999999990.002.503.336.50.9999997130.292.172.8960.9999966023.402.002.6750.999767371232.631.672.224.50.9986501021349.901.502.00*代入已知的PPM值即可換算出相對之Sigma值or代入已知之Sigma即可換算出相對之PPM*Z為一統計用之代號,Z-score=((x-u)/s);u:mean