Robustness comparison of exponentially weighted moving-average charts on autocorrelated data and on residuals

Daniel W. Apley, Hyun Cheol Lee

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


Control charting of autocorrelated data has been the subject of extensive research over the past two decades. A standard approach is to apply an exponentially weighted moving average (EWMA) chart to either the autocorrelated data or to the residuals of an autoregressive moving-average (ARMA) model of the process. Numerous empirical studies have demonstrated that many control charts for autocorrelated data, residual-based charts in particular, lack robustness to ARMA modeling errors. In this article, we quantify and corroborate these empirical findings by developing analytical expressions for the sensitivity of EWMA control charts applied to residuals and to autocorrelated data. The analytical results provide insight into the mechanisms behind the (lack of) robustness and also provide a basis for comparing the robustness of the two approaches. One conclusion is that, although the residual-based EWMA may lack robustness, it is generally more robust than the EWMA applied to the autocorrelated data.

Original languageEnglish (US)
Pages (from-to)428-447
Number of pages20
JournalJournal of Quality Technology
Issue number4
StatePublished - Oct 2008


  • Autoregressive moving-average model
  • Control chart
  • Model error
  • Robustness
  • Statistical process control

ASJC Scopus subject areas

  • Safety, Risk, Reliability and Quality
  • Strategy and Management
  • Management Science and Operations Research
  • Industrial and Manufacturing Engineering


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