A multivariate triple exponentially weighted moving average control chart
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Date
Authors
Malela-Majika, Jean-Claude
Chatterjee, Kashinath
Koukouvinos, Christos
Journal Title
Journal ISSN
Volume Title
Publisher
Wiley
Abstract
Statistical process monitoring (SPM) is mostly populated with univariate control charts used to monitor a single variable (or quality characteristic). Nowadays, industries and online environments are filled with processes in which two or more quality characteristics are related. In such situations, univariate control charts are replaced with multivariate control charts for the sake of monitoring several characteristics simultaneously. This paper develops a new multivariate triple exponentially weighted moving average (MTEWMA) chart to serve this purpose. Moreover, the design of the multivariate simple and double exponentially weighted moving average (denoted as MEWMA and MDEWMA) charts are revisited using extensive simulations. It is observed that the MTEWMA chart has very interesting time-varying properties as compared to the asymptotic properties. The newly proposed MTEWMA chart is superior over the MEWMA and MDEWMA charts in many situations of the asymptotic control limits. An illustrative example is provided to demonstrate the sensitivity of the proposed charts.
Description
Keywords
Multivariate triple exponentially weighted moving average (MTEWMA), Multivariate simple exponentially weighted moving average (MEWMA), Multivariate double exponentially weighted moving average (MDEWMA), Statistical process monitoring (SPM), Multivariate process, Overall performance, Exponentially weighted moving average (EWMA)
Sustainable Development Goals
Citation
Malela-Majika J-C, Chatterjee K, Koukouvinos C. A multivariate triple exponentially weighted moving average control chart. Quality and Reliability Engineering International 2022;38:1558–1589.https://doi.org/10.1002/qre.3038.