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Using Confidence Intervals to Compare Process Capability Indices

Summary: [This abstract is based on the authors' abstract.]When selecting a supplier or assessing process improvement, it is useful to compare capability indices for two different processes or the same process before and after adjustment. Using computer simulation, several methods for performing this comparison are assessed. Recommendations are made for choosing an appropriate method based on power and test size computations.

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  • Topics: Process Management, Process Capability
  • Keywords: Process improvement,Process capability index (Cpk),Confidence intervals
  • Author: Daniels, Lorraine; Edgar, Byron; Burdick, Richard K.; Hubele, Norma Faris
  • Journal: Quality Engineering