Multivariate and univariate process control: Geometry and shift directions

Research output: Contribution to journalArticle


Multivariate process control procedures based on simultaneous univariate control charts have been suggested by several authors. These procedures are very sensitive to the direction of a process shift. We present a simple geometrical description of this directional sensitivity and quantify its effect. The advantages of control charts based on the principal components are noted.

Original languageEnglish (US)
Pages (from-to)153-158
Number of pages6
JournalQuality and Reliability Engineering International
Issue number3
StatePublished - 1997
Externally publishedYes


  • Chi-square chart
  • Principal components
  • Statistical process control

ASJC Scopus subject areas

  • Safety, Risk, Reliability and Quality
  • Management Science and Operations Research

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