Normalized Yield (NY)Normalized yield is the average yield per process step. The probability of a unit passing through one process step or opportunity without rework. Formula:
where k equals the number of processes.
A calculation using example from above:
Calculation: Using k = 3 NY = 0.475^(1/3) NY = 0.780 = 78.0% There is a 78% chance of a unit passing through one process step without rework. Another relationship is shown below to obtain the normalized defects per unit.
The normalized defects per unit equals 0.2481. Normalized Yield and other yield metrics can serve as baseline scores (Measure Phase) and final scores for Six Sigma projects (Control Phase). The baseline score does not have to be a z-score and often these yield metrics are easier for team and other company employees to relate with and understand.
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