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Within Subgroup Variations in DOE

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  • #55599

    Nitin Verma
    Guest

    Hi!
    How is within subgroup variation addressed in full factorial DOE.
    Eg if a variable X is varied over lower spec and upper spec , the outcomes will impact the result Y in DOE model.
    However the variable X itself has inherent variation which will result in different outcomes in different trial runs.
    How do we address this process variation in variable X?

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    #200676

    MBBinWI
    Participant

    Why don’t you provide your thoughts and rationale and we can confirm or guide you where you are wrong. We don’t do homework.

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    #200679

    Robert Butler
    Participant

    Hint: Find a good book on regression and check the index for the topic concerning regression when there is variation in both the X and the Y.

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    #200694

    Mike Bonnice
    Participant

    Record the actual value of x in the worksheet in addition to the actual y. After the analysis, make a plot of residuals versus the actual x values. Or residuals versus the difference between actual x and nominal x.

    The bigger problem is that your process is in trouble if the y variable shows reproducible variation across the tolerance range of x. The point of well-chosen tolerances is that the customer will not notice a performance difference across the range of tolerance. Maybe the tolerances are too loose?

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