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A Class of Nearly Orthogonal Arrays

Summary: [This abstract is based on the authors' abstract.]While mixed-level orthogonal arrays are useful in factorial experiments when factors with different numbers of levels are to be investigated, many of them require a large number of runs. In such cases, nearly orthogonal arrays that require fewer runs may be useful. A definition of nearly orthogonal arrays of strength m is proposed, extending the concept of orthogonal arrays of strength m. The focus is on nearly orthogonal arrays involving 2- and 3-level factors with small run sizes. Some useful arrays are tabulated for practical use and are shown to have good statistical and combinational properties.

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  • Topics: Design of Experiments
  • Keywords: Mixed-level designs,Orthogonal array (OA),Factorial experiments
  • Author: Lu; Xuan; Li, William; Xie, Miao
  • Journal: Journal of Quality Technology