On designing a sequential based EWMA structure for efficient process monitoring

Control chart is a popular technique that is widely used in statistical process control to identify any possible deviations from a stable state of a process. Shewhart charts are famous for identifying larger shifts, while cumulative sum and exponentially weighted moving average control charts are we...

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Bibliographic Details
Main Authors: Saddam Akber Abbasi, Qurat-Ul-Ain Khaliq, M. Hafidz Omar, Muhammad Riaz
Format: Article
Language:English
Published: Taylor & Francis Group 2020-01-01
Series:Journal of Taibah University for Science
Subjects:
Online Access:http://dx.doi.org/10.1080/16583655.2020.1712011
Description
Summary:Control chart is a popular technique that is widely used in statistical process control to identify any possible deviations from a stable state of a process. Shewhart charts are famous for identifying larger shifts, while cumulative sum and exponentially weighted moving average control charts are well known for identifying smaller shifts in process parameters. This study examines the performance of a sequential-based EWMA (namely ${\rm SEWMA}_{\text{\texthtp}} $) chart for observing the location of a normally distributed process. The performance of ${\rm SEWMA}_{\text{\texthtp}} $ is oberved by using several overall run length properties (like average, median and standard deviation). The comparative study reveals that the overall performance of the proposed design is better than the existing counterparts. Moreover, the superiority depends on the choice of the design parameters of the proposed chart. A real-life data set from a steel rod manufacturing industry were considered to show the real-life illustration of the proposed design.
ISSN:1658-3655