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Estimation in Shewhart control charts [PDF]
, 2000 The influence of the estimation of parameters in Shewhart control charts is investigated. It is shown by simulation and asymptotics that (very) large sample sizes are needed to accurately determine control charts if estimators are plugged in. Correction terms are developed to get accurate control limits for common sample sizes in the in-control ...
Albers, Willem, Kallenberg, Wilbert C.M.
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Using the Shewhart control charts by process control
Production Engineering Archives, 2013 This article deals with the statistics pursing the process capability of turning in screws production in RIBE Slovakia, k.s. in technical practice, an important group of statistic methods is formed by analyzing qualification of measures, production ...
Katarína Lestyánszka Škůrková
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On the sensitivity of robust control charts in monitoring contaminated data [PDF]
Songklanakarin Journal of Science and Technology (SJST), 2021 Shewhart chart is typically formed under normality assumptions. In reality, much data is contaminated with occasional outliers, which may diminish the Shewhart chart’s sensitivity.
Kooi Huat Ng +3 more
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Mathematics, 2023 The quality characteristic(s) are assumed to follow the normal distribution in many control chart constructions, although this assumption may not hold in some instances.
Fatimah Alshahrani +5 more
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Using Shewhart charts to monitor quality characteristics of preventive vaccines for tuberculosis
Биопрепараты: Профилактика, диагностика, лечение, 2023 Scientific relevance. The quality of medicinal products, particularly vaccines, is contingent on the stability of the manufacturing process at all stages, which can be evaluated using Shewhart charts for data obtained by monitoring the quality attributes
A. A. Savina +2 more
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Alternative Shewhart-type charts for grouped observations [PDF]
, 2004 Classical Shewhart control charts based on groups of observations use the average as statistic to decide whether a signal should be produced or not. Here several other statistics are investigated as well. Moreover, individual charts are compared with group charts.
Albers, Willem, Kallenberg, Wilbert C.M.
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Биопрепараты: Профилактика, диагностика, лечение, 2021 The Russian Federation puts special emphasis on vaccination-related issues, in accordance with the WHO recommendations. The fact that vaccination, in particular with the diphtheria, tetanus, and pertussis vaccine (DTP vaccine), covers large population ...
I. A. Alekseeva +2 more
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MONITORING TRACTOR PERFORMANCE USING SHEWHART AND EXPONENTIALLY WEIGHTED MOVING AVERAGE CHARTS [PDF]
Engenharia Agrícola, 2021 Statistical process control has been widely used in agricultural operations for monitoring and improving process quality. This study aims to evaluate the Shewhart and exponentially weighted moving average (EWMA) control charts to monitor the performance ...
Murilo A. Voltarelli +4 more
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CONTROL CHARTS MONITORING FOR QUALITY CONCRETE PAVEMENTS [PDF]
Scientific Journal of Silesian University of Technology. Series Transport, 2020 In this article, Control charts are employed to analyse the strength quality control of ready-mixed concrete for rigid pavement. The results of the study support that CUSUM statistical analysis is more sensitive than the Shewhart control chart. The CUSUM
Izabela SKZYPCZAK +3 more
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Assessing the use of the moving window approaches when monitoring social networks using a degree corrected stochastic block model [PDF]
Review of Economics and Political Science, 2021 Purpose – This study aims to assess the effect of updating the Phase I data – to enhance the parameters' estimates – on the control charts' detection power designed to monitor social networks. Design/methodology/approach – A dynamic version of the degree
Abeer A. Zaki +2 more
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