Premium
MEWMA Control Chart and Process Capability Indices for Simple Linear Profiles with Within‐profile Autocorrelation
Author(s) -
Chiang JyunYou,
Lio Y. L.,
Tsai TzongRu
Publication year - 2017
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/qre.2101
Subject(s) - control chart , autocorrelation , shewhart individuals control chart , ewma chart , statistics , chart , statistical process control , \bar x and r chart , process (computing) , simple (philosophy) , multivariate statistics , moving average , control limits , mathematics , computer science , econometrics , operating system , philosophy , epistemology
A multivariate exponentially weighted moving average (MEWMA) control chart is proposed for detecting process shifts during the phase II monitoring of simple linear profiles (SLPs) in the presence of within‐profile autocorrelation. The proposed control chart is called MEWMA‐SLP. Furthermore, two process capability indices are proposed for evaluating the capability of in‐control SLP processes, and their utilization is demonstrated through examples. Intensive simulations reveal that the MEWMA‐SLP chart is more sensitive than existing control charts in detecting profile shifts. Copyright © 2016 John Wiley & Sons, Ltd.