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Defects per Million to difference confidence level

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  • #38732

    Eve
    Participant

     I need to convert Defects per Million to difference confidence level. Does anyone know of a correct formula?
    Thanks
    Eve

    0
    #116385

    Pankaj Singh
    Participant

    Dear Sir,
    You cannot relate DPMO with confidence level or interval etc. For same DPMO level you may have different intereval or level.But you may calculate sigma level from it ,if required.
    You send me some detail of your problem then probably I may help you.

    0
    #116432

    Bob J
    Participant

    Eve,
    If you are counting defectives, you can use p-Za/2*SQRT(p(1-p)/n) < P < p+Za/2*SQRT(p(1-p)/n)…
    You will need to convert to DPM afterwards but that shouldn’t be a problem…;-)
    Hope this helps…
    Best Regards,
    Bob J

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