An Application of Univariate and Multivariate Control Charts in Monitoring Water Quality
Control chart is a tool for detecting an out-of-control signal in statistical process control (SPC). It is widely used in process monitoring in order to detect changes in process mean or process dispersion. This study aims to illustrate the application of multivariate control charts in monitoring wa...
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| Format: | Article |
| Language: | English English |
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2020
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| Online Access: | https://eprints.ums.edu.my/id/eprint/25959/1/An%20Application%20of%20Univariate%20and%20Multivariate%20Control%20Charts%20in%20Monitoring%20Water%20Quality.pdf https://eprints.ums.edu.my/id/eprint/25959/2/An%20Application%20of%20Univariate%20and%20Multivariate%20Control%20Charts%20in%20Monitoring%20Water%20Quality1.pdf |
| _version_ | 1825713950881218560 |
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| author | Siti Rahayu Mohd Hashim Azwaan Andrew Wilter Azwal Malandi |
| author_facet | Siti Rahayu Mohd Hashim Azwaan Andrew Wilter Azwal Malandi |
| author_sort | Siti Rahayu Mohd Hashim |
| collection | UMS |
| description | Control chart is a tool for detecting an out-of-control signal in statistical process control (SPC). It is widely used in process monitoring in order to detect changes in process mean or process dispersion. This study aims to illustrate the application of multivariate control charts in monitoring water quality at one of the water treatments plants in Kota Kinabalu, Sabah. The tested water quality variables in this study are turbidity, pH value, dissolved oxygen (DO) and concentration of ferum. Two multivariate control charts, Hotelling’sT2 and MCUSUM control charts are constructed under the violation of the multivariate normality assumption. The purpose is to study the effect of non-normal data upon the monitoring process using the selected multivariate control charts. By comparing the monitoring process between the two types of control charts, the consistency of the results is studied. All the univariate and multivariate control charts produced out-of-control signals from different points, hence inconclusive results obtained |
| first_indexed | 2024-03-06T03:04:31Z |
| format | Article |
| id | ums.eprints-25959 |
| institution | Universiti Malaysia Sabah |
| language | English English |
| last_indexed | 2024-03-06T03:04:31Z |
| publishDate | 2020 |
| record_format | dspace |
| spelling | ums.eprints-259592020-09-15T07:47:01Z https://eprints.ums.edu.my/id/eprint/25959/ An Application of Univariate and Multivariate Control Charts in Monitoring Water Quality Siti Rahayu Mohd Hashim Azwaan Andrew Wilter Azwal Malandi Q Science (General) Control chart is a tool for detecting an out-of-control signal in statistical process control (SPC). It is widely used in process monitoring in order to detect changes in process mean or process dispersion. This study aims to illustrate the application of multivariate control charts in monitoring water quality at one of the water treatments plants in Kota Kinabalu, Sabah. The tested water quality variables in this study are turbidity, pH value, dissolved oxygen (DO) and concentration of ferum. Two multivariate control charts, Hotelling’sT2 and MCUSUM control charts are constructed under the violation of the multivariate normality assumption. The purpose is to study the effect of non-normal data upon the monitoring process using the selected multivariate control charts. By comparing the monitoring process between the two types of control charts, the consistency of the results is studied. All the univariate and multivariate control charts produced out-of-control signals from different points, hence inconclusive results obtained 2020 Article PeerReviewed text en https://eprints.ums.edu.my/id/eprint/25959/1/An%20Application%20of%20Univariate%20and%20Multivariate%20Control%20Charts%20in%20Monitoring%20Water%20Quality.pdf text en https://eprints.ums.edu.my/id/eprint/25959/2/An%20Application%20of%20Univariate%20and%20Multivariate%20Control%20Charts%20in%20Monitoring%20Water%20Quality1.pdf Siti Rahayu Mohd Hashim and Azwaan Andrew and Wilter Azwal Malandi (2020) An Application of Univariate and Multivariate Control Charts in Monitoring Water Quality. ASM Science Journal., 13. pp. 1-7. https://doi.org/10.32802/asmscj.2020.sm26(1.3) |
| spellingShingle | Q Science (General) Siti Rahayu Mohd Hashim Azwaan Andrew Wilter Azwal Malandi An Application of Univariate and Multivariate Control Charts in Monitoring Water Quality |
| title | An Application of Univariate and Multivariate Control Charts in Monitoring Water Quality |
| title_full | An Application of Univariate and Multivariate Control Charts in Monitoring Water Quality |
| title_fullStr | An Application of Univariate and Multivariate Control Charts in Monitoring Water Quality |
| title_full_unstemmed | An Application of Univariate and Multivariate Control Charts in Monitoring Water Quality |
| title_short | An Application of Univariate and Multivariate Control Charts in Monitoring Water Quality |
| title_sort | application of univariate and multivariate control charts in monitoring water quality |
| topic | Q Science (General) |
| url | https://eprints.ums.edu.my/id/eprint/25959/1/An%20Application%20of%20Univariate%20and%20Multivariate%20Control%20Charts%20in%20Monitoring%20Water%20Quality.pdf https://eprints.ums.edu.my/id/eprint/25959/2/An%20Application%20of%20Univariate%20and%20Multivariate%20Control%20Charts%20in%20Monitoring%20Water%20Quality1.pdf |
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