An EWMA chart for monitoring the process standard deviation when parameters are estimated

The EWMA chart for the standard deviation is a useful tool for monitoring the variability of a process quality characteristic. The performance of this chart is usually evaluated under the assumption of known parameters. However, in practice, process parameters are estimated from an in-control Phase...

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Bibliographic Details
Published inComputational statistics & data analysis Vol. 53; no. 7; pp. 2653 - 2664
Main Authors Maravelakis, Petros E., Castagliola, Philippe
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 15.05.2009
Elsevier
SeriesComputational Statistics & Data Analysis
Subjects
Applications
Exact sciences and technology
General topics
Mathematics
Multivariate analysis
Numerical analysis
Numerical analysis. Scientific computation
Numerical methods in probability and statistics
Probability and statistics
Reliability, life testing, quality control
Sciences and techniques of general use
Statistics
Industry
Statistical method
Engineering
Data analysis
Control chart
Statistical computation
Standard deviation
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Summary:The EWMA chart for the standard deviation is a useful tool for monitoring the variability of a process quality characteristic. The performance of this chart is usually evaluated under the assumption of known parameters. However, in practice, process parameters are estimated from an in-control Phase I data set. A modified EWMA control chart is proposed for monitoring the standard deviation when the parameters are estimated. The Run Length properties of this chart are studied and its performance is evaluated by comparing it with the same chart but with process parameters assumed known.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0167-9473
1872-7352
DOI:10.1016/j.csda.2009.01.004