Real-time quality control of nuchal translucency measurements using the exponentially weighted moving average chart
نویسندگان
چکیده
منابع مشابه
real time detection of a measles outbreak using the exponentially weighted moving average: does it work?
background : there are few published studies that use real data testing to examine the performance of outbreak detection methods. the aim of this study was to determine the performance of the exponentially weighted moving average (ewma) in real time detection of a local outbreak in mashhad city, eastern iran . methods : the ewma algorithms (both ewma 1 with λ=0.3 and ewma 2 with λ=0.6) were app...
متن کاملFuzzy exponentially weighted moving average control chart for univariate data with a real case application
Statistical process control (SPC) is an approach to evaluate processes whether they are in statistical control or not. For this aim, control charts are generally used. Since sample data may include uncertainties coming from measurement systems and environmental conditions, fuzzy numbers and/or linguistic variables can be used to capture these uncertainties. In this paper, one of the most popula...
متن کاملMultivariate Exponentially Weighted Moving Average Chart for Monitoring Poisson Observations∗
In many practical situations, multiple variables often need to be monitored simultaneously to ensure the process is in control. In this article, we develop a feasible multivariate monitoring procedure based on the general Multivariate Exponentially Weighted Moving Average (MEWMA) to monitor the multivariate count data. The multivariate count data is modeled using Poisson-Lognormal distribution ...
متن کاملRisk-adjusted survival time monitoring with an updating exponentially weighted moving average (EWMA) control chart.
Monitoring medical outcomes is desirable to help quickly detect performance changes. Previous applications have focused mostly on binary outcomes, such as 30-day mortality after surgery. However, in many applications the survival time data are routinely collected. In this paper, we propose an updating exponentially weighted moving average (EWMA) control chart to monitor risk-adjusted survival t...
متن کاملAverage Run Length Performance for Multivariate Exponentially Weighted Moving Average Control Chart Procedure with Application
The drawbacks to multivariate charting schemes is their inability to identify which variable was the source of the signal. The multivariate exponentially weighted moving average (MEWMA) developed by Lowry, et al (1992) is an example of a multivariate charting scheme whose monitoring statistic is unable to determine which variable caused the signal. In this paper, the run length performance of m...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Taiwanese Journal of Obstetrics and Gynecology
سال: 2021
ISSN: 1028-4559
DOI: 10.1016/j.tjog.2020.11.012