Browsing Mathematics, Statistics & Physics by Author "Abbasi S.A."
Now showing items 1-12 of 12
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An Efficient Phase I Analysis of Linear Profiles with Application in Photo-Voltaic System
Mahmood T.; Abbasi S.A.; Riaz M.; Abbas N. ( Springer Verlag , 2019 , Article)In many manufacturing industries, quality of an item depends on different characteristics and their relationship may be modeled by profiles. For instance, in photo-voltaic (PV) system, output voltage is dependent on the ... -
Enhancing the performance of the EWMA control chart for monitoring the process mean using auxiliary information
Adegoke N.A.; Abbasi S.A.; Dawod A.B.A.; Pawley M.D.M. ( John Wiley and Sons Ltd , 2019 , Article)When using control charts to monitor manufacturing processes, the exponentially weighted moving average (EWMA) control chart is useful for detecting persistent shifts in the process parameter. This paper proposes enhancements ... -
Location charts based on ranked set sampling for normal and non-normal processes
Abbasi S.A. ( John Wiley and Sons Ltd , 2019 , Article)Control charts, based on ranked set sampling schemes, had been proposed recently for efficient monitoring of process location. All the proposals in the literature are based on the ideal assumption of normally distributed ... -
Monitoring Coefficient of Variation Using Progressive Mean Technique
Abbasi S.A.; Mohamed M.A.; Ahmed M.A.; Lajara R.J.; Hadi H.F. ( Institute of Electrical and Electronics Engineers Inc. , 2019 , Conference Paper)Control charts are mostly used for the monitoring of process mean and dispersion. In cases, when the process standard deviation is proportional to the mean, it is recommended to use control charts based on coefficient of ... -
Multivariate coefficient of variation control charts in phase I of SPC
Abbasi S.A.; Adegoke N.A. ( Springer London , 2018 , Article)Multivariate control charts are mostly available for monitoring the process mean vector or the covariance matrix. Recently, work has been done on monitoring the multivariate coefficient of variation (CV) in phase II of the ... -
Noise pollution in the hospital environment of a developing country: A case study of Lahore (Pakistan)
Baqar M.; Arslan M.; Abbasi S.A.; Ashraf U.; Khalid A.; Zahid H.... more authors ... less authors ( Taylor and Francis Inc. , 2018 , Article)The present study investigates the noise pollution levels in public- and private-sector hospitals of Lahore. The noise pollution parameters were investigated from 20 public and 10 private hospitals. We observed that the ... -
On auxiliary information-based control charts for autocorrelated processes with application in manufacturing industry
Ahmad S.; Riaz M.; Hussain S.; Abbasi S.A. ( Springer London , 2019 , Article)Multivariate autoregressive (MAR) models are an attractive choice for applications in the processes related to finance, medical, and industry. For the monitoring of such processes, control chart is the most important and ... -
On efficient estimation strategies in monitoring of linear profiles
Dawod A.B.A.; Al-Momani M.; Abbasi S.A. ( Springer London , 2018 , Article)A fundamental strategy to diminish variations in manufacturing process urged the practitioners to characterize the quality of a process by a relationship between the response variable and one or more explanatory variables ... -
On improved monitoring of linear profiles under modified successive sampling
Riaz M.; Mahmood T.; Abbas N.; Abbasi S.A. ( John Wiley and Sons Ltd , 2019 , Article)Control charts are often used for the monitoring of quality characteristics of interest. There may exist some other characteristics that are associated with the main quality characteristic. A model that quantifies the ... -
On the performance of coefficient of variation control charts in Phase I
Dawod A.B.A.; Abbasi S.A.; Al-Momani M. ( John Wiley and Sons Ltd , 2018 , Article)Control charts are mainly carried out in 2 interconnected phases: Phase I (retrospective phase) and Phase II (monitoring phase). Phase I uses a stable historical sample to establish control limits that will be used later ... -
Optimization design of the CUSUM and EWMA charts for autocorrelated processes
Osei-Aning R.; Abbasi S.A.; Riaz M. ( John Wiley and Sons Ltd , 2017 , Article)The traditional control charts produce frequent false alarm signals in the presence of autocorrelation. The implementation of the modified chart scheme is a way of handling the problem of autocorrelation in control charts. ... -
Shrinkage estimates of covariance matrices to improve the performance of multivariate cumulative sum control charts
Adegoke N.A.; Smith A.N.H.; Anderson M.J.; Abbasi S.A.; Pawley M.D.M. ( Elsevier Ltd , 2018 , Article)Multivariate cumulative sum control charts require knowledge of the in-control process covariance parameters. Here, we show that the performance of the multivariate cumulative sum control charts for individual-observation ...