iSixSigma

99% good

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  • #28214

    Neynes Ladha
    Participant

    what sixma level is 99% good?
    what is 3.8 sigma as a percentage?
    Can anybody help,
    Kind Regards
     
    NL

    0
    #69927

    Edwards
    Participant

    99% good equates to 3.83 sigma level. This should answer both questions.
     
    David

    0
    #69945

    gt
    Participant

    99% good is 2.53 sigma long term, 3.83 short term
    to help you:
    use in excel:
    norminv(.99,0,1)
     wich is the std function we should use for normal distributed data. The .99 correspond to the yield, the other values come from the central limit theorem. To determine the z value or sigma of a certain process we have to use the z table wich comes from the normalization of the data to a normal distribution with a mean of zero and a std dev of 1
    rgds

    0
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