Projections and the U2 multivariate control chart

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


A projection approach to designing multivariate control schemes is used that simplifies the construction and understanding of these charts. The method is applied to construct charts that are sensitive to specific assignable causes such as a mean shift that affects only a subset of the variables and a model-fixed assignable cause that can occur when one variable causes another. The projection results in a chart that is easy to compute and design and it has greater sensitivity than a chi-square chart for the assignable cause under study. Furthermore, the chart can be analyzed using the convenient central and noncentral chi square distributions when the process is on-target and off-target, respectively.

Original languageEnglish (US)
Pages (from-to)313-319
Number of pages7
JournalJournal of Quality Technology
Issue number3
StatePublished - Jul 1996
Externally publishedYes


  • Average Run Length
  • Chi-Square Control Charts
  • Multivariate Control Charts
  • 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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