Efficient homogeneously weighted dispersion control charts with an application to distillation process
نویسندگان
چکیده
Monitoring disturbances in process dispersion using control chart is mostly based on the assumption that quality characteristic follows normal distribution, which not case many real-life situations. This paper proposes a set of new charts homogeneously weighted moving average (HWMA) scheme, for efficient detection shifts standard deviation (σ). These are variety σ estimators and investigated as well heavy tailed symmetric skewed distributions. The shift ability evaluated different run length characteristics, such (ARL), extra quadratic loss (EQL), relative ARL measures. performance proposed HWMA also compared with existing EWMA charts, design parameters. Furthermore, an illustrative example presented to monitor vapor pressure distillation process.
منابع مشابه
Mixed Cumulative Sum-Exponentially Weighted Moving Average Control Charts: An Efficient Way of Monitoring Process Location
Shewhart, exponentially weighted moving average (EWMA), and cumulative sum (CUSUM) charts are famous statistical tools, to handle special causes and to bring the process back in statistical control. Shewhart charts are useful to detect large shifts, whereas EWMA and CUSUM are more sensitive for small to moderate shifts. In this study, we propose a new control chart, named mixed CUSUM-EWMA chart...
متن کاملMemory-Type Control Charts for Monitoring the Process Dispersion
Control charts have been broadly used for monitoring the process mean and dispersion. Cumulative sum (CUSUM) and exponentially weighted moving average (EWMA) control charts are memory control charts as they utilize the past information in setting up the control structure. This makes CUSUM and EWMA-type charts good at detecting small disturbances in the process. This article proposes two new mem...
متن کاملMultivariate statistical process control charts: an overview
In this paper we discuss the basic procedures for the implementation of multivariate statistical process control via control charting. Furthermore, we review multivariate extensions for all kinds of univariate control charts, such as multivariate Shewhart-type control charts, multivariate CUSUM control charts and multivariate EWMA control charts. In addition, we review unique procedures for the...
متن کاملStatistical process control charts.
An outbreak of invasive aspergillosis among allogeneic bone marrow transplants: a case-control study. Infect Confvol1985;6:347-355. 3. Sherertz RJ, Belani A, Kramer BS. et al. Impact of air filtration on nosocomialA@ergil-lus infections. Unique risk of bone marrow transplant recipients. A discriminant scorecard for diagnosis of invasive pulmonary asper-gillosis in patients with acute leukemia. ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Quality and Reliability Engineering International
سال: 2021
ISSN: ['0748-8017', '1099-1638']
DOI: https://doi.org/10.1002/qre.2904