Results 1 to 10 of about 6,512 (216)

Analysis of inadequate cervical smears using Shewhart control charts. [PDF]

BMC Public Health, 2004
Background Inadequate cervical smears cannot be analysed, can cause distress to women, are a financial burden to the NHS and may lead to further unnecessary procedures being undertaken.
Harrison WN, Mohammed MA, Wall MK, Marshall TP.   +3 more
europepmc   +5 more sources

The Poisson CUSUM Chart for Monitoring Small Counts: Addressing the Estimation Uncertainty. [PDF]

Biom J
ABSTRACT This study addresses the impact of estimating in‐control parameters on the performance of the Poisson cumulative sum (CUSUM) chart in detecting an increase in the mean when the counts are small. To reduce false signals induced by estimation uncertainty, recommendations prescribe impractically large sample sizes or propose methods that widen ...
Heidema S, Stoepker IV, Huits R, Heuvel ERVD.   +3 more
europepmc   +2 more sources

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
doaj   +2 more sources

Long-term stability analysis of beam shape in a robotic radiosurgery system. [PDF]

J Appl Clin Med Phys
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.
Hinoto R, Kashiyama S, Eriguchi T, Tsukamoto N, Sakae T.   +4 more
europepmc   +2 more sources

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.
Albers, W., Kallenberg, W.C.M.
core   +3 more sources

A comparative analysis of mean charts assuming Weibull and generalized exponential distributions. [PDF]

Heliyon
This study discusses Shewhart control charts to monitor the mean of non-normally distributed data using extensive Monte Carlo simulations. In particular, Weibull, exponential, and generalized exponential distributions are used to conduct a systematic ...
Raza A, Ali S, Shah I, Al-Rezami AY, Almazah MMA.   +4 more
europepmc   +2 more sources

Measuring variations in healthcare data using run charts and statistical process control charts: a survey of general physicians attending the quality improvement workshop. [PDF]

Intern Med J
ABSTRACT General physicians as system leaders play a significant role in quality improvement (QI) initiatives within respective health services. However, there are very few formal QI training programmes available for general physicians in Australia. This survey described the experiences of attendees at the 2024 Internal Medicine Society of Australia ...
Aung AK, Mertin H, Wong A, Johnson DF, Lee JI.   +4 more
europepmc   +2 more sources

Prediction Intervals for Overdispersed Poisson Data and Their Application in Medical and Pre-Clinical Quality Control. [PDF]

Pharm Stat
ABSTRACT In pre‐clinical and medical quality control, it is of interest to assess the stability of the process under monitoring or to validate a current observation using historical control data. Classically, this is done by the application of historical control limits (HCL) graphically displayed in control charts. In many applications, HCL are applied
Menssen M, Dammann M, Fneish F, Ellenberger D, Schaarschmidt F.   +4 more
europepmc   +2 more sources

APSS – Software Support for Decision Making in Statistical Process Control [PDF]

Kvalita Inovácia Prosperita, 2018
Purpose: SPC can be defined as the problem solving process incorporating many separate decisions including selection of the control chart based on the verification of the data presumptions.
Darja Noskievicova
doaj   +3 more sources

On Designing of Bayesian Shewhart-Type Control Charts for Maxwell Distributed Processes with Application of Boring Machine

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, Ibrahim M. Almanjahie, Majid Khan, Syed M. Anwar, Zahid Rasheed, Ammara N. Cheema   +5 more
doaj   +1 more source