Robust individuals control chart for shifts in process mean and variance
Statistical process control (SPC) involves ongoing checks to ensure whether the mean or variance of the process readings has changed. When a change does occur, the control chart should locate it quickly. If the operator can also be supplied information that aids in the search for the special cause,...
| Main Authors: | , |
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| Format: | Conference or Workshop Item |
| Language: | English |
| Published: |
WSEAS Press
2010
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| Online Access: | http://psasir.upm.edu.my/id/eprint/64984/ http://psasir.upm.edu.my/id/eprint/64984/1/A%20-46.pdf |
| _version_ | 1848855157723365376 |
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| author | Ng, Kooi Huat Midi, Habshah |
| author_facet | Ng, Kooi Huat Midi, Habshah |
| author_sort | Ng, Kooi Huat |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | Statistical process control (SPC) involves ongoing checks to ensure whether the mean or variance of the process readings has changed. When a change does occur, the control chart should locate it quickly. If the operator can also be supplied information that aids in the search for the special cause, then critical off-line time can be saved. We examine a process-monitoring tool that not only provides speedy detection regardless of the magnitude of the process shift, but also provides useful change point statistics. A Likelihood ratio method is used to develop test statistics for step change shifts. Apart from traditional charts, robust control charts is a better alternative for a process with contaminated data as the effects of the outlying data values are eliminated. In which robustness against assignable causes of variation appears to be important. The proposed methodology is demonstrated with numerical example. |
| first_indexed | 2025-11-15T11:21:18Z |
| format | Conference or Workshop Item |
| id | upm-64984 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T11:21:18Z |
| publishDate | 2010 |
| publisher | WSEAS Press |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-649842018-09-03T04:15:47Z http://psasir.upm.edu.my/id/eprint/64984/ Robust individuals control chart for shifts in process mean and variance Ng, Kooi Huat Midi, Habshah Statistical process control (SPC) involves ongoing checks to ensure whether the mean or variance of the process readings has changed. When a change does occur, the control chart should locate it quickly. If the operator can also be supplied information that aids in the search for the special cause, then critical off-line time can be saved. We examine a process-monitoring tool that not only provides speedy detection regardless of the magnitude of the process shift, but also provides useful change point statistics. A Likelihood ratio method is used to develop test statistics for step change shifts. Apart from traditional charts, robust control charts is a better alternative for a process with contaminated data as the effects of the outlying data values are eliminated. In which robustness against assignable causes of variation appears to be important. The proposed methodology is demonstrated with numerical example. WSEAS Press 2010 Conference or Workshop Item PeerReviewed text en http://psasir.upm.edu.my/id/eprint/64984/1/A%20-46.pdf Ng, Kooi Huat and Midi, Habshah (2010) Robust individuals control chart for shifts in process mean and variance. In: 9th WSEAS International Conference on Applications of Computer Engineering (ACE '10), 23-25 Mar. 2010, Penang, Malaysia. (pp. 270-275). |
| spellingShingle | Ng, Kooi Huat Midi, Habshah Robust individuals control chart for shifts in process mean and variance |
| title | Robust individuals control chart for shifts in process mean and variance |
| title_full | Robust individuals control chart for shifts in process mean and variance |
| title_fullStr | Robust individuals control chart for shifts in process mean and variance |
| title_full_unstemmed | Robust individuals control chart for shifts in process mean and variance |
| title_short | Robust individuals control chart for shifts in process mean and variance |
| title_sort | robust individuals control chart for shifts in process mean and variance |
| url | http://psasir.upm.edu.my/id/eprint/64984/ http://psasir.upm.edu.my/id/eprint/64984/1/A%20-46.pdf |