Results 51 to 60 of about 1,881 (223)

A Robust L‐Comoments Covariance Matrix‐Based Hotelling's T2${T^{2}}$ Control Chart for Monitoring High‐Dimensional Non‐Normal Multivariate Data in the Presence of Outliers

Quality and Reliability Engineering International, Volume 41, Issue 7, Page 3308-3317, November 2025.
ABSTRACT This article introduces a new robust multivariate Hotelling T‐square (TS) control chart that incorporates an L‐Comoments covariance matrix into a multivariate statistical process control (MSPC) charting scheme to enhance its robustness and detection ability.
Muhammad Arslan, Usman Shahzad, Ali Yeganeh, Huiming Zhu, JC Malela‐Majika, Shakeel Ahmad   +5 more
wiley   +1 more source

Introduction of a general class of entropy-based control charts: The Φ-chart

Managerial Economics
We introduce a new class of Shewhart control charts, namely the f-chart. This new class is based on the cumulative paired f-divergence that generalizes both the cumulative (residual) entropy and the differential entropy.
Benedikt Mangold, Jens Konopik
doaj   +1 more source

Gráficos de Controle CUSUM: um enfoque dinâmico para a análise estatística de processos [PDF]

, 2003
Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia de Produção.O monitoramento efetivo das características da qualidade de um processo de produção depende freqüentemente de ...
Alves, Custodio da Cunha
core  

Simulated shewhart control chart for monitoring variance components

, 2013
Shewhart control charts based on the simulation method are proposed for monitoring separate variance components of the single-factor random effect model.
Tsai, Tzong-Ru, Tsai, Tzong-Ru; Hdieh, Yi-Wei   +1 more
core   +1 more source

Prediction Intervals for Overdispersed Binomial Endpoints and Their Application to Toxicological Historical Control Data

Pharmaceutical Statistics, Volume 24, Issue 5, September/October 2025.
ABSTRACT For toxicology studies, the validation of the concurrent control group by historical control data (HCD) has become requirements. This validation is usually done by historical control limits (HCL), which should cover the observations of the concurrent control with a predefined level of confidence.
Max Menssen, Jonathan Rathjens
wiley   +1 more source

The Effect of Autocorrelation on the Shewhart-RZ Control Chart

, 2021
In many industrial manufacturing processes, the quality of products depends on the relation between two main ingredients or characteristics. Often, this calls for monitoring the ratio of two normal random variables with statistical process control (SPC) techniques. A large number of studies related to designing control charts monitoring this ratio have
Nguyen, H. D., Nadi, A. Ahmadi, Tran, K. P., Castagliola, P., Celano, G., Tran, K. D.   +5 more
openaire   +2 more sources

The Application of Six Sigma to Assess the Analytical Performance of Plasma Proteins and Design a Risk‐Based Statistical Quality Control Strategy: A Multicenter Study

Journal of Clinical Laboratory Analysis, Volume 39, Issue 16, August 2025.
The six sigma model can objectively assess the analytical performance of plasma proteins. Different control concentrations yield different sigma values, which are visually displayed through standardized sigma performance verification charts. The six sigma model enables the development of personalized quality control strategies for each assay.
Ming Hu, Jiaping Wang, Huan Yang, Sugang Zang, Tingting Gao, Jian Zeng, Fumeng Yang   +6 more
wiley   +1 more source

Carta de control CEV para distribuciones Weibull con datos censurados CEVControl Chart for Weibull Distributions with Censored Data

Revista Colombiana de Estadística, 2005
En algunas aplicaciones en el área de la industria no se puede contar con la información completa y se debe trabajar con observaciones censura das, haciendo inadecuada la aplicación directa de las cartas de control de Shewhart y np.
JOSÉ VARGAS N, TYSUA MONTAÑO P
doaj  

Waiting Time Control Chart for M/G/1 Retrial Queue

Computation
Retrial queues are used extensively to model many practical problems in service systems, call centers, data centers, and computer network systems. The average waiting time is the main observable characteristic of the retrial queues. Long queues may cause
Yih-Bey Lin, Tzu-Hsin Liu, Yu-Cheng Tsai, Fu-Min Chang   +3 more
doaj   +1 more source

Design of a Control Chart Using Extended EWMA Statistic

Technologies, 2018
In the present paper, we propose a control chart based on extended exponentially weighted moving average (EEWMA) statistic to detect a quick shift in the mean. The mean and variance expression of the proposed EEWMA statistic are derived.
Muhammad Naveed, Muhamma Azam, Nasrullah Khan, Muhammad Aslam   +3 more
doaj   +1 more source