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An Alternative to the Bivariate Control Chart for Process Dispersion

Summary: [This abstract is based on the authors' abstract.] A Shewhart-type control chart is proposed for monitoring changes in the process variability of a bivariate process. The chart is based on the generalized Gini mean differences. The design structure of the proposed chart is developed assuming bivariate normality of two correlated quality characteristics, and its performance is then compared with that of the S-chart.

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  • Topics: Statistical Process Control (SPC)
  • Keywords: Average run length (ARL), Control charts, Shewhart control chart, Variance (statistics), Non-normality, Normality, Process variability
  • Author: Riaz, Muhammad; Does, Ronald J. M. M.
  • Journal: Quality Engineering