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The Stochastic Control Of Process Capability Indices - Discussion

Gomez-Villegas, Miguel Angel (1998) The Stochastic Control Of Process Capability Indices - Discussion. Test, 7 (1). pp. 1-74. ISSN 1133-0686

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Abstract

In manufacturing science, process capability indices play a role analogous to economic indices in government statistics. The existing capability indices are passive
devices whose main role is to retroactively monitor process capability. They have been developed under the restrictive assumption of process stability, and the procedures for using them are based on ad hoc rules. Using the normative point of view for decision making, it can be shown that some of the indices are, at best,convoluted special cases of a more general strategy; they can be justified only under
special assumptions, and the manner in which they are currently used could lead to incoherent actions. The available process capability indices should therefore be
abandoned and replaced by procedures that are normative, and also proactive with respect to both, prediction and control. An approach towards achieving this goal is proposed.


Item Type:Article
Uncontrolled Keywords:Process capability indices, quality control, manufacturing science,tolerances, control variables.
Subjects:Sciences > Mathematics > Mathematical statistics
ID Code:15957
References:

Conlin, M. (1998). Revealed at last: the secret of Jack Welch's success. Forbes,January 26, 1998, p. 44.

Lindley, D. V. and N. D. Singpurwalla (1991). On the evidence needed to reach agreed action between adversaries with application to acceptance sampling. Journal of the American Statistical Association, 86, 416, 933-937. Lindley, D. V. and N. D. Singpurwalla (1993). Adversarial life testing. Journal of the Royal Statistical Society, Series B, 55, 4, 837-847.

Deposited On:13 Jul 2012 11:10
Last Modified:06 Feb 2014 10:35

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