نتایج جستجو برای: S chart

تعداد نتایج: 735870  

2003
Gemai Chen Smiley W. Cheng SMILEY W. CHENG

Control chart techniques have been widely used in industries to monitor a process in quality improvement. Whenever we deal with variables data, we usually employ a combination of X-bar chart and R chart (or S chart) to monitor both the center and the spread of the process. In this paper, we propose a simple alternative, that is, we design a single chart to monitor both the center and the spread...

2003
D. HE A. GRIGORYAN

Double sampling (DS) s charts are designed to allow quick detection of a small shift in process standard deviations and to provide a quick response in an agile manufacturing environment. However, current developed DS s charts assume that the sample standard deviations follow a normal distribution. Although valid for relatively large sample sizes, this assumption has limited the application of D...

Journal: :International Journal of Research in Advent Technology 2019

2014
Emanuel P. Barbosa Mario A. Gneri Ariane Meneguetti

This paper presents an improved version of the Shewhart-type generalized variance |S| control chart for multivariate Gaussian process dispersion monitoring, based on the Cornish-Fisher quantile formula for non-normality correction of the traditional normal based 3-sigma chart limits. Also, the exact sample distribution of |S| and its quantiles (chart exact limits) are obtained through the Meije...

ژورنال: Hormozgan Medical Journal 2005
Rahmaty, R., Asadi noghabi, F. , Hosseinzadeh , K. , Pormehryabandeh, A. , Sobhani, Gh. , Yoosefi, H. ,

Introduction: Surveying the growth and development of children is an important parameter in their health assessment. Since the growth affecting agents vary in countries, it is not sensible considering a unique growth chart for all. In this research, we have studied the growth chart of children from birth to month 24 in Bandar Abbas with regard to the standard growth curve. Methods: In this des...

Nandini Das

Control charts are used to identify the presence of assignable cause of variation in the process. Non-parametric control chart is an emerging area of recent development in the theory of SPC. Its main advantage is that it does not require any knowledge about the underlying distribution of the variable. In this paper a non-parametric control chart for controlling variability has been developed. I...

2011
Saddam Akber Abbasi

Control chart is the most important Statistical Process Control tool used to monitor reliability and performance of industrial processes. For monitoring changes in process dispersion, the R and S charts are widely used. These control charts perform better under the ideal assumption of normality but are well known to be very inefficient in presence of outliers or departures from normality. In th...

Journal: :International Journal of Hybrid Information Technology 2015

Journal: :Japanese Journal of Radiological Technology 1995

2015
N. Saeed S. Kamal

In statistical process control, the control charts are the most powerful tools for assessing the process behaviour. The Shewhart S chart is a standard tool for determining process variability. Similar to S chart, the chart based on Median Absolute Deviation from the sample median namely MAD estimator is also considered robust for both normal and non-normal processes. As ̅ and are considered unbi...

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