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Nonstationarity in statistical process control — issues, cases, ideas

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  • Bart De Ketelaere
  • Kristof Mertens
  • Frank Mathijs
  • Daniel Sabin Diaz
  • Josse De Baerdemaeker

Abstract

Statistical process control (SPC) is a powerful framework that is used in many industries to decrease process variability and to pinpoint special cause variation. Although a broad range of techniques have been developed to do so, often the real‐life situation does not fully comply with the basic assumptions that are made in SPC resulting in poor results. One of the main violations against the assumptions is the fact that industrial processes rarely behave in a stationary manner — this is evidently the case for biological processes but is also an important issue when monitoring industrial processes. Besides, the ever increasing amount of data, with a clear shift towards multivariate and even multiway quality control, makes the classical univariate approach not feasible anymore. These two observations pose important challenges to statisticians to develop novel SPC algorithms that are broadly applicable in modern industries. In this contribution we discuss both issues and use two very different case studies to show the reader recent directions and developments in the SPC landscape. Copyright © 2011 John Wiley & Sons, Ltd.

Suggested Citation

  • Bart De Ketelaere & Kristof Mertens & Frank Mathijs & Daniel Sabin Diaz & Josse De Baerdemaeker, 2011. "Nonstationarity in statistical process control — issues, cases, ideas," Applied Stochastic Models in Business and Industry, John Wiley & Sons, vol. 27(4), pages 367-376, July.
    • Handle: RePEc:wly:apsmbi:v:27:y:2011:i:4:p:367-376
    DOI: 10.1002/asmb.911
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