Discussion : A Messy, But Instructive, Case Study In Design of Experiments

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Discussion A Messy, But Instructive, Case
StudyIn Design of Experiments

• Written by
• Belva J. Cooley, LeRoy A. Francklin, Gary Elrod
• Quality Engineering, 12(2), 211-216 (1999-2000)

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Contribution of Paper

• Facilitate a better understanding of the torque
  breaking strength for several assembly
  procedures
• Propose a guideline to the real problem

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Advantages

• Approach to the real problem
• (In order to solve thorny problem)
• Handling the missing data
• Graphical representation of the data
• Examine the equality of variances
• - breaking the one large problem into two
  smaller problems
• - students t-tests

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Disadvantages

• This paper is just a case study.
• No creative or innovative approach to the data
  analysis.
• Fortune

• Full factorial design - dividable data set etc.

Fortunate data
take such a step as the occasion demands

• a close look at

Trivial results

• Hole 1 Assembly -1 Barrel 1

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Discussion Points

• Is the statistical or complex approach needed for
  such a simple data set?
• If a data set is complex and composed of the
  large number of data, what then can be done?