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- Title
Evaluating process centering with large samples – an approximate lower bound on the accuracy index.
- Authors
Lin, G. H.
- Abstract
Process accuracy index Ca has been proposed in the manufacturing industry to provide numerical measures on process centering (the ability to cluster around the specification mid-point). Investigations on process accuracy in existing engineering statistics and quality assurance literature are all focused on small samples with a normality assumption. In this paper, a natural estimator of process accuracy index is considered. The limiting distribution and related large sample properties of the considered estimator are studied under general populations having fourth central moment exists. A decision-making procedure based on an approximate 100(1-α)% lower bound of the process accuracy index is also constructed. A practical example is demonstrated to illustrate how the proposed procedure may be applied for in-plant applications to judge whether the process runs under the desirable accuracy requirement.
- Subjects
PRODUCTION engineering; MANUFACTURING processes; ENGINEERING statistics; NUMERICAL analysis; DECISION making; RELIABILITY in engineering
- Publication
International Journal of Advanced Manufacturing Technology, 2006, Vol 28, Issue 1/2, p149
- ISSN
0268-3768
- Publication type
Article
- DOI
10.1007/s00170-004-2341-y