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Before we go ahead, lets define two terms:
Here are various formulae to measure different metrics related to Six Sigma Defects Defects Per Unit - DPU
The probability of getting 'r' defects in a sample having a given dpu rate can be predicted with the Poisson Distribution. Total Opportunities - TO
Defects Per Opportunity - DPO
Defects Per Million Opportunities - DPMO
Defects Per Million Opportunities or DPMO can be then converted to sigma values using Yield to Sigma Conversion Table given in Six Sigma - Measure Phase. According to the conversion table
How to find your Sigma Level
Simplified Sigma Conversion Table
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