Pp vs. Cp

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    Eileen Beachell

    Your question is “What does the k stand for?” When you calculate the distance the mean is from the closest specification limit, you use a z-score. That is, you calculate the distance of the average from the spec limit in units of the std. dev. (take the distance and divide by 3-sigma).
    This calculation used to be referred to as a k-value (1950’s?)(later referred to as z). Hence the confusion. Maybe we should start calling it Cz ??
    Eileen Beachell, Quality Disciplines

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