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Process Capability for Attribute Data.

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  • #34470

    RK
    Member

    Hi All,
    I am trying to measure the process capability for a data collection process. My Six Sigma measurement is % Defects (Defect defined as erroneous data) recorded monthly. I am using an XmR chart to record the measurement and I beleive the process average would give me the process capability.
    Am I on the right track. I would appreciate if someone can throw light on this?
    Your help much appreciated.
    RK
     
     
     

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    #95120

    rwatters
    Member

    You will need to figure out how many samples you have checked and how many opportunities there are for a defect. Multiply the opportunities by the # samples to get your total opps, then devide the # of defects by total opps to get your DPO. Multiply this # by 1,000,000 to get your DPMO and then convert this to a sigma value.
    Eg.
    Defs=99     Units=7528    Opps=2     Total Opps=15056
    99/15056=0.006575×1,000,000
    DPMO=6575
    6575dpmo= 3.98 sigma(approx)

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