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Det elliptiska säkerhetsområdets robusthet: hur robust är metoden med de elliptiska säkerhetsområdena förett symmetriskt men icke normalfördelat datamaterial?
Umeå University, Faculty of Social Sciences, Department of Statistics.
Umeå University, Faculty of Social Sciences, Department of Statistics.
2010 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
The robustness of the elliptical safety region (English)
Abstract [en]

Quality Control is a term often used within production and is referring to managing processes so they produce capable products. Within Quality Control, process capability index is a common measure to oversee processes. Safety Region Plots were introduced to do this graphically. In Albing & Vännman (2010) the concept of Safety Region Plots is expanded to incorporate an elliptical shape. The method of Elliptical Safety Region Plots assumes a normally distributed data. In this paper we are looking at the robustness of the Elliptical Safety Region Plots if we can assume a symmetrically, but non-normal, distribution. In the results we can conclude that an adjustment is required for symmetric, but non-normal, data if the method in Albing & Vännman (2010) is going to be used. An eventual adjustment is discussed in discussions. To easily be able to use the Elliptical Safety Region Plots mentioned in Albing & Vännman (2010) we have developed a program in RExcel.

Place, publisher, year, edition, pages
2010. , 59 p.
Keyword [en]
Elliptical safety region plot, RExcel, non-normality
National Category
Probability Theory and Statistics
URN: urn:nbn:se:umu:diva-34821OAI: diva2:325841
Social and Behavioural Science, Law
Available from: 2010-06-22 Created: 2010-06-21 Last updated: 2010-06-24Bibliographically approved

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