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Viewing 3 posts - 1 through 3 (of 3 total)
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  • June 20, 2006 at 7:28 pm #43786

    Bala Karthik
    ★ 10 Years ★
    Participant

    Hello-
    my USL and LSL for a process is 5 mins and 20 mins. I have about 100 data points and all the data points are within the spec limits, which means no defects. However when i run a pcap my z score is not 6. When i calculated the sigma score using the isixsigma calculator it says my sigma level is 6 but minitab pcap says it is 1.16. Please help
     

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    June 20, 2006 at 8:10 pm #139368

    Jered Horn
    ★ 10 Years ★
    Participant

    What numbers did you key into the Sigma Calculator to get a Z value of 6?
    Did Minitab calculate a Z value of 1.16?  I ask that because a “default” process capability analysis in Minitab doesn’t display the Z value.  Also, if that’s the case, the probability of a defect is something like 12.3%…which doesn’t seem likely.
    Basically, the information you provided in your post (spec limits and number of data points) isn’t enough to calculate process capability.

    0
    June 21, 2006 at 8:11 am #139382

    Yadav
    ★ 10 Years ★
    Participant

    Bala,
    Can you provide details of your data ???

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