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A Wald Test for Comparing Multiple Capability Indices

Summary: [This abstract is based on the authors' abstract.]The capability index CPU is recommended for quality features such a linearity, flatness, circularity, and cylindricity that exhibit a unilateral specification of USL. Using industrial data sets as illustrations, a Wald statistic is developed for testing the equality of k CPU indices. The procedure is then extended for testing the equality of k CPL indices used to summarize process performance relative to a single lower specification limit.

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