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Identifying Need for New Factors in EVOP

Summary: [This abstract is based on the authors' abstract.]Evolutionary operation (EVOP), introduced by Box in 1957, was first applied manually to operations by teams who met frequently to determine whether EVOP should shift to a new phase. A recently developed automated EVOP approach has required a replacement be found for the team meetings to handle phase changes. A new method that capitalizes on the time series aspects of EVOP is described for determining when new factors need to be incorporated into the design. The method compares a time order-independent variance of the response variable with one that is time order dependent. Examples of the proposed method are given.

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  • Topics: Design of Experiments, Data Quality
  • Keywords: Evolutionary operation (EVOP),Factor analysis,Variable data,Variance components
  • Author: Holmes, Donald S.; Mergen, A. Erhan
  • Journal: Quality Engineering