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The SPRT control chart for process dispersion
Author(s) -
Godase Dadasaheb G.,
Mahadik Shashibhushan B.
Publication year - 2019
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.2481
Subject(s) - control chart , chart , markov chain , statistical process control , sequential probability ratio test , computer science , control limits , ewma chart , statistics , dispersion (optics) , process (computing) , x bar chart , reliability engineering , mathematics , engineering , physics , optics , operating system
This paper investigates the statistical performance of a sequential probability ratio test control chart for monitoring the dispersion of a normally distributed process. The expressions for statistical performance measures of the chart are derived using a Markov chain approach. It is shown through numerical comparisons that the overall statistical performance of this chart is superior to that of the existing competitor charts for dispersion. An example illustrating an application of the chart in practice is provided.