Six Sigma Fundamentals: A Complete Introduction to the System, Methods, and Tools

In addition to the statistical formulas, there are some basic formulas that everyone should be familiar with. They are:

• Proportion defective = [number of defectives]/[number of units].

• Final yield (noted as Y_final) = 1 - Proportion defective.

• Defects per unit (DPU) = [number of defects]/number of units].

• Defects per opportunity (DPO) = [number of defects]/number of units number of opportunities].

• Defects per million opportunities (DPMO) = DPO 1,000,000.

• first pass yield = 1 - [number of units reworked]/[number of units input].