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Efficient shift detection using multivariate exponentially‐weighted moving average control charts and principal components
Author(s) -
Scranton Richard,
Runger George C.,
Keats J. Bert,
Montgomery Douglas C.
Publication year - 1996
Publication title -
quality and reliability engineering international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 62
eISSN - 1099-1638
pISSN - 0748-8017
DOI - 10.1002/(sici)1099-1638(199605)12:3<165::aid-qre990>3.0.co;2-q
Subject(s) - control chart , principal component analysis , multivariate statistics , statistics , control limits , ewma chart , shewhart individuals control chart , x bar chart , statistical process control , mathematics , chart , moving average , process (computing) , multivariate analysis , control (management) , econometrics , computer science , artificial intelligence , operating system
This paper demonstrates the use of principal components in conjunction with the multivariate exponentially‐weighted moving average (MEWMA) control procedure for process monitoring. It is demonstrated that the number of variables to be monitored is reduced through this approach, and that the average run length to detect process shifts or upsets is substantially reduced as well. The performance of the MEWMA applied to all the variables may be related to the MEWMA control chart that uses principal components through the non‐centrality parameter. An average run length table demonstrates the advantages of the principal components MEWMA over the procedure that uses all of the variables. An illustrative example is provided.