Basic Process Capability Indices: An Expository Review

Mohammed Z. Anis

International Statistical Review, 2008, vol. 76, issue 3, 347-367

Abstract: A review of the four basic process capability indices has been made. The interrelationship among these indices has been highlighted. Attention has been drawn to their drawbacks. The relation of these indices to the proportion nonconforming has been dwelt upon and the requirement of the adequate sample size has been emphasized. Cautionary remarks on the use of these indices in the case of nonnormal distributions, skewed distributions, and autocorrelated data are also presented. The effect of measurement error on process capability indices has been dealt with in great detail. Une revue des quatre index de capacité de procédé fondamentaux a été faite. L'inter‐relation entre ces index a été soulignée. L'attention a été dessinée à leurs inconvénients. La relation de ces index au nonconformer de proportion a été demeurée sur et la condition de la taille d'échantillon suffisante a été soulignée. Les remarques d'avertissement sur l'usage de ces index dans le cas de distributions nonnormaux, les distributions déformés et les données d'auto‐correspondu sont aussi présentés. L'effet d'erreur de mesure sur les index de capacité de procédé a été traité dans les moindres détails.

Date: 2008
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