Results 121 to 130 of about 6,021 (172)

Runs rules for bivariate Shewhart chart

IWSM. 1998 3rd International Workshop on Statistical Metrology (Cat. No.98EX113), 2002
Among the various statistical process control (SPC) charts, the Shewhart chart (Shewhart, Economic Control of Quality Improvement, Van Nostrand Reinhold, 1931) has been the most used control chart in practice due to its simplicity and explicit representation.
Chen, Argon, Guo, Ruey-Shan, Lee, Chun-Lin   +2 more
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Shewhart Control Charts

1979
The concept of a control chart was evolved by Dr. Shewhart in America in 1924 — the initial development in Britain being mainly by Dr. Dudding and W. Jennett. Dr. Shewhart suggested that the control chart should have three main objectives.
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Standardization of Shewhart Control Charts

Journal of Quality Technology, 1989
(1989). Standardization of Shewhart Control Charts. Journal of Quality Technology: Vol. 21, No. 4, pp. 287-289.
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Shewhart-Type Charts in Nonstandard Situations

Technometrics, 1995
Standard textbooks on statistical process control generally offer simple procedures to construct control charts. In many situations the resulting charts are of limited use because the variance components of the process are not adequately taken into account. In this article, an example of this is discussed.
Roes, K.C.B., Does, R.J.M.M.
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RESIDUAL ANALYSIS WITH SHEWHART CONTROL CHARTS

Quality Engineering, 1991
We show that the conditions for process stability are equivalent to the conditions for the error terms of a valid regression model (one in which the least squares estimators are unbiased and have minimum variance among all unbiased estimators). By viewi..
HOWARD S. GITLOW, ROSA OPPENHEIM
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Normality test by Shewhart control chart

Journal of Information and Optimization Sciences, 1999
Abstract Transformed quantile-quantile (TQQ) and transformed probability-probability (TPP) plots are developed with control limits for the detection of deviations from the normal distribution. It will be shown that TQQ and TPP plots are useful methods for normality test when they are adopted with Shewhart control technique.
Jea-Young Lee, Jung-Soo Woo, Seong-Won Rhee   +2 more
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The economic performance of the Shewhart t chart

Quality and Reliability Engineering International, 2011
AbstractIn the production of small batches of customized parts, high flexibility and frequent switching of production from one product variant to another could not allow for the implementation of a control chart to monitor the process. In fact, when a short‐run production should be started, the distribution parameters of the quality characteristics to ...
P. CASTAGLIOLA, CELANO, GIOVANNI, FICHERA, Sergio, E. TROVATO   +3 more
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Fuzzy Control Chart A Better Alternative for Shewhart Average Chart

Quality & Quantity, 2006
This paper through a real illustrative example and a power test shows that designing a fuzzy control chart for process average of a continuous (variable) quality characteristic with a warning line is a better alternative to Shewhart \(\bar{X}\) chart in many respects, like providing better neural view to inspectors, offering different strategic options
Faraz, Alireza, MOGHADAM, M. B.
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A Nonparametric Shewhart-Type Synthetic Control Chart

Communications in Statistics - Simulation and Computation, 2010
In this article, we provide a nonparametric Shewhart-type synthetic control chart based on the signed-rank statistic to monitor shifts in the known in-control process median. The synthetic control chart is a combination of a signed-rank chart due to Bakir (2004) and a conforming run length chart due to Bourke (1991).
V. Y. Pawar, D. T. Shirke
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Shewhart x-charts with estimated process variance

Communications in Statistics - Theory and Methods, 1981
Properties of the Shewhart X-chart for controlling the mean of a process with a normal distribution are investigated for the situation where the process variance O2must be estimated from initial sample data. The control limits of the X-chart depend on the estimate of O2and thus, unlike the case when O2is known, the X-chart is not equivalent to a ...
B.K. Ghosh, Marion R. Reynolds, Van Hui Yer   +2 more
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