Results 31 to 40 of about 3,958 (193)
Journal of Probability and Statistics, 2018 This study proposes EWMA-type control charts by considering some auxiliary information. The ratio estimation technique for the mean with ranked set sampling design is used in designing the control structure of the proposed charts.
Hina Khan +3 more
doaj +1 more source
Control charts for monitoring drip irrigation with different hydraulic heads
Revista Ambiente & Água, 2020 This study monitored a drip irrigation system with different hydraulic heads, using control charts. The study included 25 tests, and was conducted at the Experimental Nucleus of Agricultural Engineering of the State University of Western Paraná, located ...
Allan Remor Lopes +4 more
doaj +1 more source
A Fuzzy EWMA Attribute Control Chart to Monitor Process Mean
Information, 2018 Conventional control charts are one of the most important techniques in statistical process control which are used to assess the performance of processes to see whether they are in- or out-of-control.
Muhammad Zahir Khan +4 more
doaj +1 more source
Scientific Reports, 2023 In recent times, there has been a growing focus among researchers on memory-based control charts. The Exponentially Weighted Moving Average (EWMA) and Cumulative Sum (CUSUM) charts and the adaptive control charting approaches got the attention.
Muhammad Atif Sarwar +5 more
doaj +1 more source
An adaptive multivariate functional EWMA control chart
Journal of Quality TechnologyIn many modern industrial scenarios, the measurements of the quality characteristics of interest are often required to be represented as functional data or profiles. This motivates the growing interest in extending traditional univariate statistical process monitoring (SPM) schemes to the functional data setting. This article proposes a new SPM scheme,
Capezza, Christian +4 more
openaire +3 more sources
Scientific AfricanThis study addresses challenges in Phase II univariate process control, where in-control data exists but underlying process distributions are unknown.
Joseph Odunayo Braimah +2 more
doaj +1 more source
Adaptive multivariate dispersion control chart with application to bimetal thermostat data
Scientific Reports, 2023 Adaptive EWMA (AEWMA) control charts have gained remarkable recognition by monitoring productions over a wide range of shifts. The adaptation of computational statistic as per system shift is the main aspect behind the proficiency of these charts.
Muhammad Noor-ul-Amin +5 more
doaj +1 more source
Nonparametric Double EWMA Control Chart for Process Monitoring
Revista Colombiana de Estadística, 2016 <p>In monitoring process parameters, we assume normality of the quality characteristic of interest, which is an ideal assumption. In many practical sit- uations, we may not know the distributional behavior of the data, and hence, the need arises use nonparametric techniques.
RIAZ, MUHAMMAD, ABBASI, SADDAM AKBER
openaire +5 more sources
Design of moving average chart and auxiliary information based chart using extended EWMA
Scientific Reports, 2023 The control chart is the most valuable tool in the manufacturing process to track the output process in the industries. Quality specialists always want a visual framework that recognizes sustainable improvements in the monitoring processes.
Muhammad Naveed +5 more
doaj +1 more source
Robust point location estimators for the EWMA control chart [PDF]
Quality Technology & Quantitative Management, 2016 In practice, the EWMA control chart for process monitoring is based on parameters estimated from a retrospective data set representing the process characteristic under study. This data set may contain contaminated observations, which in turn can affect the estimates and hence the control chart’s performance.
Zwetsloot, I.M. +2 more
openaire +2 more sources