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Multivariate Control Chart for Process Dispersion Based on Individual Observations
Authors:
Michael B. C. Khoo a;
S. H. Quah a
(Show Biographies)
| Affiliation: | a School of Mathematical Sciences, Universiti Sains Malaysia, USM, Penang, Malaysia |
DOI:
10.1081/QEN-120018394
Publication Frequency:
4 issues per year
Subjects:
Mathematics & Statistics for Engineers;
Production & Quality Control Management;
Production Systems;
Quality Control & Reliability;
Statistical Theory & Methods;
Statistics;
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Abstract
In this paper, we will discuss a simple way for monitoring shifts in the covariance matrix of a p-dimensional multivariate normal process distribution, Np(μ,Σ). An exact method based on the chi-square distribution for constructing multivariate control limits will also be shown. We will illustrate the proposed procedure at work based on an example.
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| Keywords: Process dispersion; In-control; Out-of-control; Average run length (ARL) |
| view references (2) : view citations |
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