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Abstract
A new measure of the process capability (Cpm) is proposed that takes into account the proximity to the target value as well as the process variation when assessing process performance. The sampling distribution for an estimate of Cpm (Ĉpm) and some of its properties have been examined and an example of its application is included. The new index is easy to compute and, with the aid of the included tables, easy to analyze. Ĉpm has some more desirable statistical properties than Ĉp and Ĉpk, the estimates of the Cp and Cpk indices, respectively.
Additional information
Notes on contributors
Lai K. Chan
Dr. Chan is a Professor and Head of the Department of Statistics. He is a Senior Member of ASQC.
Smiley W. Cheng
Dr. Cheng is a Professor in the Department of Statistics. He is a Member of ASQC.
Frederick A. Spiring
Mr. Spiring is a Graduate Student in the Department of Statistics.