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A Messy, But Instructive, Case Study in Design of Experiments

Summary: [This abstract is based on the authors' abstract.] A company that manufacturers fans wished to use an experimental design to determine the best combination of three factors affecting the breaking torque of the fans. Data analysis ceased to be straightforward when the data failed the test for homogeneity of variances. Data transformation for meeting necessary assumptions was unsuccessful. So, a graphical analysis and a careful study of the means for each design point ensued. A statistically sound but novel strategy for completing this analysis is described.

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  • Topics: Design of Experiments
  • Keywords: Case study,Design of experiments (DOE),Factorial designs,Statistical tests,Homogeneity
  • Author: Cooley, B. J.; Franklin, L. A.; Elrod, G.
  • Journal: Quality Engineering