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Normal Data for Control Charting?

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  • #32892

    Pritesh
    Participant

    Hi!!
    I need some help….does data have to be normal to be able to be control charted and have control limits established?
    This is a question posed to me durring an internal audit of our processes.

    Thanks for your help.
    -Pritesh.

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    #88384

    Gabriel
    Participant

    NO.
    Absolutely not.
    In fact, non-normal distributions are charted all the time. For example, R (in an Xbar-R chart) is not normal by definition of Range.

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    #88390

    rams
    Participant

    Also, that is why we use Xbar charts to achieve normality of data by invoking the central limit theorem.
     

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