An Improved Approach for Estimating Product Performance Based on the Capability Index C pmk |
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Authors: | W L Pearn Ya-Ching Cheng |
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Institution: | Department of Industrial Engineering and Management , National Chiao Tung University , Hsinchu , Taiwan |
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Abstract: | In this article, we construct an improved procedure for estimating the process capability index C pmk . We propose a new C pmk lower-bound approach based on the GCI concept, and compare it with other existing methods. Based on the comparison results, we conclude with a recommendation, and construct a step-by-step procedure for the recommended approach to estimate the actual process capability C pmk for various sample sizes. The lower bound attended by our recommended approach, indeed, improves other existing lower bound methods. We also investigate a real-world application to illustrate how we could apply the recommended approach to the actual manufacturing processes. |
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Keywords: | Confidence level Coverage rate Generalized confidence intervals Lower confidence bound Process capability index Process loss Process yield |
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