# cp to DPMO?

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umich1404
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I know I can use this formula to convert Cpk to DPMO
Sigma Level= 0.8406 + SQRT(29.37 – 2.221 * (ln(DPMO)))Cpk= Sigma level / 3
But what about converting Cp to DPMO?
Thanks

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#189577

I’m not familiar with this formula, but it looks like you’ve assumed a Possion Distribution? Is this assumption reasonable given the following:”1. The probability of observing a single event over a small interval is approximately proportional to the size of that interval.
2. The probability of two events occurring in the same narrow interval is negligible.
3. The probability of an event within a certain interval does not change over different intervals.
4. The probability of an event in one interval is independent of the probability of an event in any other non-overlapping interval.” Quoted from http://www.childrens-mercy.org/stats/definitions/poisson.htmCheers,
Andy

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