Results 61 to 70 of about 6,536 (217)

A novel experience in the use of control charts for the detection of nosocomial infection outbreaks

Clinics, 2011
OBJECTIVE: This study aims to compare different control charts to monitor the nosocomial infection rate per 1,000 patient-days. METHODS: The control charts considered in this study were the traditional Shewhart chart and a variation of this, the ...
Isabel Cristina Gomes, Sueli Aparecida Mingoti, Cláudia Di Lorenzo Oliveira   +2 more
doaj   +1 more source

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 equipment and qualification of process.
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

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

Shewhart’s Control Chart: Some Observations

, 1999
Data Analysis in Shewhart’s Control Chart, to use the original m samples n sized intensities, is the main subject of this paper. Given m × n intensities we examine three alternatives to sintetize the variability: a) arithmetic mean of m standard deviations (' S); b) root mean square of m variances (" S); c) global dispersion ("" S).
openaire   +3 more sources

Long‐term stability analysis of beam shape in a robotic radiosurgery system

Journal of Applied Clinical Medical Physics, Volume 26, Issue 7, July 2025.
Abstract Purpose This study aimed to investigate the long‐term stability of CyberKnife beam profile parameters and assess their compliance with existing quality assurance (QA) guidelines. We evaluated beam profiles in both standard and diagonal planes over 3.5 years post‐installation to detect potential issues and ensure consistent beam quality.
Ryoichi Hinoto, Shiho Kashiyama, Takahisa Eriguchi, Nobuhiro Tsukamoto, Takeji Sakae   +4 more
wiley   +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

Control charts using minima instead of averages [PDF]

, 2006
Traditional control charts are commonly based on the averages of the inspected groups of observations. It turns out to be quite worthwhile to consider alternative approaches.
Albers, W., Kallenberg, W.C.M.
core   +1 more source

A Practical Approach to Implementing ICH Q14: Tools for Analytical Quality by Design in Capillary Electrophoresis Method Development

ELECTROPHORESIS, Volume 46, Issue 13-14, Page 933-953, July 2025.
ABSTRACT The ICH Q14 guideline introduces a structured framework for analytical method development based on Analytical Quality by Design (AQbD) principles, aiming to ensure robust, reliable, and fit‐for‐purpose methods throughout the product lifecycle.
Ewoud van Tricht, Cari E. Sänger ‐ van de Griend   +1 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
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