Det elliptiska säkerhetsområdets robusthet: hur robust är metoden med de elliptiska säkerhetsområdena förett symmetriskt men icke normalfördelat datamaterial?
Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
The robustness of the elliptical safety region (English)
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.
Elliptical safety region plot, RExcel, non-normality
Probability Theory and Statistics
IdentifiersURN: urn:nbn:se:umu:diva-34821OAI: oai:DiVA.org:umu-34821DiVA: diva2:325841
UppsokSocial and Behavioural Science, Law