نتایج جستجو برای: ewma techniques

تعداد نتایج: 628987  

2010
Stefan H. Steiner Kristina Grant Michael Coory Heath A. Kelly

BACKGROUND Influenza viruses cause seasonal outbreaks in temperate climates, usually during winter and early spring, and are endemic in tropical climates. The severity and length of influenza outbreaks vary from year to year. Quick and reliable detection of the start of an outbreak is needed to promote public health measures. METHODS We propose the use of an exponentially weighted moving aver...

Journal: :Statistics in medicine 2010
Stefan H Steiner Mark Jones

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...

2016
Yupaporn Areepong Saowanit Sukparungsee

In this paper we propose the explicit formulas of Average Run Length (ARL) of Exponentially Weighted Moving Average (EWMA) control chart for Autoregressive Integrated Moving Average: ARIMA (p,d,q) (P, D, Q)L process with exponential white noise. To check the accuracy, the ARL results were compared with numerical integral equations based on the Gauss-Legendre rule. There was an excellent agreeme...

Journal: :Appl. Soft Comput. 2014
Sevil Sentürk Nihal Erginel Ihsan Kaya Cengiz Kahraman

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...

2003
Alec Woo David Culler

Real-time wireless link reliability estimation is a fundamental building block for self-organization of multihop sensor networks. Observed connectivity at low-power is more chaotic and unpredictable than in wireless LANs, and available resources are severely constrained. We seek estimators that react quickly to large changes, yet are stable, have a small memory footprint and are simple to compu...

2012
Petar Čisar Sanja Maravić Čisar

Many intrusions which attempt to compromise the security of computer and network systems manifest themselves in changes in the intensity of events. Because of the ability of exponentially weighted moving average (EWMA) statistics to monitor the rate of occurrences of events based on their intensity, this technique is appropriate for implementation in control limits based algorithms. The researc...

Journal: :Quality and Reliability Eng. Int. 2011
Hyun Cheol Lee Daniel W. Apley

Charts for Autocorrelated Processes Hyun Cheol Lee Samsung Electronics, Semiconductor Business Quality Assurance Dept. Banwol-Dong, Hwasung-City Gyeonggi-Do, Korea 445-701 Phone: 82-31-208-4717 Fax: 82-31-208-6699 Email: [email protected] Daniel W. Apley (Corresponding Author) Department of Industrial Engineering and Management Sciences Northwestern University Evanston, IL 60208-3119 Phone: 8...

2007
Tuan Anh Trinh Sándor Molnár

One of the most promising active queue management schemes being proposed for deployment in the Internet is RED. However, research results on RED performance are highly mixed, especially in the field of tuning its parameters. In this paper, we revisit some features in RED and study them in greater details. We point out that RED in general does not possess proportional loss between flows as claim...

Journal: :NeuroImage 2007
Martin A Lindquist Christian Waugh Tor D Wager

The general linear model (GLM) approach has arguably become the dominant way to analyze functional magnetic resonance imaging (fMRI) data. It tests whether activity in a brain region is systematically related to some known input function. However, the GLM becomes impractical when the precise timing and duration of psychological events cannot be specified a priori. In this work, we introduce a n...

Journal: :Mathematical Problems in Engineering 2022

Control charts are used to detect assignable causes in different manufacturing and nonmanufacturing processes. This study presents a new maximum exponentially weighted moving average (Max-EWMA) chart for joint unit interval time magnitude monitoring. To this end, beta distribution is considered whereas simplex magnitude. Average run length (ARL), standard deviation of (SDRL), quantiles evaluate...

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