Results 171 to 180 of about 6,512 (216)

Shewhart-Type Control Charts for Individual Observations

Journal of Quality Technology, 1993
Several options in designing a Shewhart-type control chart for individual observations are discussed. A number of possible estimators of the standard deviation are considered. A two-stage procedure is suggested for retrospective testing. Finally, it is ..
Kit C. B. Roes, Ronald J. M. M. Does, Yvonne Schurink   +2 more
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ADAPTIVE SAMPLING ENHANCEMENTS FOR SHEWHART CONTROL CHARTS

IIE Transactions, 1993
Adaptive sampling is an enhancement to a classical statistical process control scheme in which the time between samples from the process is varied based on the available information. Unlike the classical Shewhart control schemes, the performance of an adaptive sampling scheme for detecting a process which is off-target before the First observation is ...
GEORGE C. RUNGER, DOUGLAS C. MONTGOMERY
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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 Semi-Bayesian Method for Shewhart Individual Control Charts

Quality Technology & Quantitative Management, 2006
Keywords: Keywords: Bernstein polynomials, non-parametrics, quality control, semi-Bayesian, statistical process control.
Vermaat, T.M.B., Does, R.J.M.M.
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Statistical Process Control using Shewhart Control Charts with Supplementary Runs Rules

Methodology and Computing in Applied Probability, 2007
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Koutras, M. V., Bersimis, S., Maravelakis, P. E.   +2 more
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On the α-risks for shewhart control charts

Communications in Statistics - Simulation and Computation, 1992
The performance of the usual Shewhart control charts for monitoring process means and variation can be greatly affected by nonnormal data or subgroups that are correlated. Define the αk-risk for a Shewhart chart to be the probability that at least one “out-of-control” subgroup occurs in k subgroups when the control limits are calculated from the k ...
C.S. Padgett, L.A. Thombs, W.J. Padgett
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Planning time-between-events Shewhart control charts

Total Quality Management, 1998
Shewhart charts for counts are widely used in statistical process control. Usually, they are designed with, as observation to be monitored, the number or the proportion of counts occurring in sampl...
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Two simple Shewhart‐type multivariate nonparametric control charts

Applied Stochastic Models in Business and Industry, 2011
In many quality control applications, the necessary distributional assumptions to correctly apply the traditional parametric control charts are either not met or there is simply no enough information or evidence to verify the assumptions. It is well known that the performance of many parametric control charts can be seriously degraded in situations ...
J. M. Boone, S. Chakraborti
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Interpreting Shewhart X̄ Control Charts

Journal of Quality Technology, 1985
(1985). Interpreting Shewhart X Control Charts. Journal of Quality Technology: Vol. 17, No. 2, pp. 114-116.
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Shewhart Control Charts with Unequal Subgroup Sizes

Journal of Quality Technology, 1994
(1994). Shewhart Control Charts with Unequal Subgroup Sizes. Journal of Quality Technology: Vol. 26, No. 1, pp. 64-67.
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