Results 281 to 290 of about 17,139,342 (375)

EWMA control charts and extended EWMA control charts.

, 2002
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Double exponentially weighted moving average control chart with supplementary runs-rules

Quality Technology & Quantitative Management, 2020
Enhancing the sensitivity of control charts for detecting small process shift is desirable and may be done in different ways. In this paper, we propose the double exponentially weighted moving average (DEWMA) control chart using the 2-of-2 and 1-of-1 or ...
O. A. Adeoti, J. Malela‐Majika
semanticscholar   +1 more source

An adaptive EWMA control chart for monitoring the process mean in Bayesian theory under different loss functions

Quality and Reliability Engineering International, 2020
The Shewhart control chart is used for detecting the large shift and an exponentially weighted moving average (EWMA) control chart is used for detecting the small/moderate shift in the process mean.
M. Noorulamin, Surria Noor
semanticscholar   +1 more source

Two perspectives for designing a phase II control chart with estimated parameters: The case of the Shewhart Chart

Journal of QualityTechnology, 2020
The impact of parameter estimation on control charts has been studied with great interest in the recent literature. The estimated control limits affect chart performance, often negatively, relative to the known parameter case.
F. S. Jardim, S. Chakraborti, E. Epprecht   +2 more
semanticscholar   +1 more source

Functional Regression Control Chart

Technometrics, 2020
The modern development of data acquisition technologies in many industrial processes is facilitating the collection of quality characteristics that are apt to be modeled as functions, which are usually referred to as profiles.
Fabio Centofanti, A. Lepore, A. Menafoglio, B. Palumbo, S. Vantini   +4 more
semanticscholar   +1 more source

A double homogeneously weighted moving average control chart for monitoring of the process mean

Quality and Reliability Engineering International, 2020
In the service and manufacturing industry, memory‐type control charts are extensively applied for monitoring the production process. These types of charts have the ability to efficiently detect disturbances, especially of smaller amount, in the process ...
Muhammad Abid, Aroosa Shabbir, H. Z. Nazir, Rehan Ahmad Khan Sherwani, M. Riaz   +4 more
semanticscholar   +1 more source

The triple exponentially weighted moving average control chart

, 2020
Quality control charts are extensively used to monitor processes. The EWMA chart is a good alternative to the Shewhart chart to quickly detect small and moderate shifts in the process mean.
Vasileios Alevizakos, K. Chatterjee, C. Koukouvinos   +2 more
semanticscholar   +1 more source

An EWMA control chart for categorical processes with applications to social network monitoring

Journal of QualityTechnology, 2019
Statistical process monitoring (SPM) has traditionally been applied to manufacturing processes; however, more recent developments highlight its application to social networks.
M. Perry
semanticscholar   +1 more source

A new nonparametric double exponentially weighted moving average control chart

Quality and Reliability Engineering International, 2019
There are many practical situations where the underlying distribution of the quality characteristic either deviates from normality or it is unknown. In such cases, practitioners often make use of the nonparametric control charts.
M. Raza, Tahir Nawaz, M. Aslam, S. H. Bhatti, Rehan Ahmad Khan Sherwani   +4 more
semanticscholar   +1 more source