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Unification of some multivariate process capability indices for asymmetric specification region
Authors:Moutushi Chatterjee  Ashis Kumar Chakraborty
Affiliation:1. SQC & OR Unit, Indian Statistical Institute, Kolkata, India;2. Lady Brabourne College, Kolkata, India
Abstract:In manufacturing industries, it is often seen that the bilateral specification limits corresponding to a particular quality characteristic are not symmetric with respect to the stipulated target. A unified superstructure urn:x-wiley:stan:media:stan12112:stan12112-math-0001 of univariate process capability indices was specially designed for processes with asymmetric specification limits. However, as in most of the practical situations a process consists of a number of inter‐related quality characteristics, subsequently, a multivariate analogue of urn:x-wiley:stan:media:stan12112:stan12112-math-0002, which is called CM(u,v), was developed. In the present paper, we study some properties of CM(u,v) like threshold value and compatibility with the asymmetry in loss function. We also discuss estimation procedures for plug‐in estimators of some of the member indices of CM(u,v). Finally, the superstructure is applied to a numerical example to supplement the theory developed in this article.
Keywords:asymmetry in loss function  capability indices  multivariate delta method  non‐normality  threshold value
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