A Multivariate Discriminator for Process Drift

Korean Society for Quality Management
Publication Type:
Journal Article
The Asian Journal on Quality, 2002, 3 (1), pp. 119 - 128
Issue Date:
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Multivariate Exponentially Weighted Moving Average (MEWMA) chart is a control chart under multivariate process based on the idea of EWMA that rapidly detects small dispersion with a trend. The MEWMA chart was first time discussed by Woodall. However, in his study the correlativity among the multivariate was not considered for the selection of the constant of the diagonal matrix (the smooth parameter i.). In this paper, the EWMA chart with a generalized smooth parameter matrix has been discussed which is believed to have a better fitness for practical production processes than Woodall's approach.
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