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Skewed zero-bound distributions and process capability indices for upper specifications
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Matematiska vetenskaper.
2009 (engelsk)Inngår i: Journal of Applied Statistics, ISSN 0266-4763, E-ISSN 1360-0532, Vol. 36, nr 2, s. 205-221Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

A common practical situation in process capability analysis, which is not well developed theoretically, is when the quality characteristic of interest has a skewed distribution with a long tail towards relatively large values and an upper specification limit only exists. In such situations it is not uncommon that the smallest possible value of the characteristic is 0 and this also is the best value to obtain. Hence a target value 0 is assumed to exist. We investigate a new class of process capability indices for this situation. Two estimators of the proposed index are studied and the asymptotic distributions of these estimators are derived. Furthermore we suggest a decision procedure useful when drawing conclusions about the capability at a given significance level, based on the estimated indices and their asymptotic distributions. A simulation study is also performed, assuming that the quality characteristic is Weibull distributed, to investigate the true significance level when the sample size is finite.

sted, utgiver, år, opplag, sider
2009. Vol. 36, nr 2, s. 205-221
HSV kategori
Forskningsprogram
Matematisk statistik inriktning industriell statistik
Identifikatorer
URN: urn:nbn:se:ltu:diva-12942DOI: 10.1080/02664760802443954ISI: 000261738300006Scopus ID: 2-s2.0-57949109145Lokal ID: c1716d10-79c4-11dd-b356-000ea68e967bOAI: oai:DiVA.org:ltu-12942DiVA, id: diva2:985893
Merknad
Validerad; 2009; 20080903 (malina)Tilgjengelig fra: 2016-09-29 Laget: 2016-09-29 Sist oppdatert: 2018-07-10bibliografisk kontrollert

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