The first thing we want to do is calculate the DPMO (Defects Per Million Opportunities). To do that, we will define an Opportunity as one registration card. A defect is a card that cannot be processed due to some fraudulent issue with the card (duplicate, fake name, dead person, etc.).
For our data, we'll use information from Cleveland where ACORN led a very successful voter registration drive. There are other places where one can get data, but they're all in the same ballpark from a DPMO stand point.
Let's run the numbers, shall we?
- Total number of cards: 65,000
- Total number of defects: 80
- DPMO: 1231
- Sigma: 4.6
- Yield: 99.998%