Results 101 to 110 of about 1,881 (223)
三個分類水準的EWMA 及Shewhart-EWMA 管制圖
, 2010 碩士在生產過程中，製程常會受到許多因素干擾而產生變異，進而對品質特性產生影響，降低品質水準。當製程因干擾而產生變異時，統計製程管制(Statistical Process Control，簡稱SPC)能迅速地偵測出造成製程變異的可歸屬原因，以利品質管制人員採取修正措施並降低不良品的產生數量 。 本論文延伸Cassady 和 Nachlas (2006) 所提出之三個分類水準Shewhart 管制圖到三個分類水準的指數加權移動平均(Exponentially Weighted Moving Average，
顏文品; Yen, Wen-pin
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GEPROS: Gestão da Produção, Operações e Sistemas, 2014 The quality of products and processes has proven to be crucial for companies to compete in the market. Statistical process control enables them to foresee problems in the process, thereby ensuring the quality of manufactured items.
Elisa Henning +4 more
doaj
Cusum charts for preliminary analysis of individual observations
A preliminary Cusum chart based on individual observations is developed from the uniformly most powerful test for the detection of linear trends. This Cusum chart is compared with several of its competitors which are based on the likelihood ratio test ...
Koning, A.J., Does, R.J.M.M.
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A scaled weighted variance S control chart for skewed populations [PDF]
, 2016 This paper proposes a new S control chart for monitoring process dispersion of skewed populations. This control chart, called Scaled Weighted Variance S control chart (SWV-S) hereafter, this new SWV-S control chart is an improvement of the Weighted ...
Shoraim, Majid H. A. +4 more
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Individuals charts and additional tests for changes in spread
Some authors recommend the use of an additional test for detecting increases in the spread, when using a control chart for individual observations. We examine this recommendation both in a practical situation and theoretically. Both studies show that the
Wieringa, Jaap E., Trip, Albert
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A new procedure for monitoring the range and standard deviation of a quality characteristic
The Shewhart and the Bonferroni-adjustment R and S chart are usually applied to monitor the range and the standard deviation of a quality characteristic. These charts are used to recognize the process variability of a quality characteristic.
Panaretos, John +2 more
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ON PERFORMANCE OF METHODS FOR STATISTICAL SURVEILLANCE
, 1994 Statistical surveillance is used to detect a change in a process. It might for example be a change of the level of a characteristic of an economic time series or a change of heart rate in intensive care.
Åkermo, Göran
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Control Charts for the Lognormal Distribution
Control Charts are the main tools of Statistical Process Control. They are used for deciding whether a process is statistically stable or not. Much theory and many applications have been developed for the Gaussian (Normal) distribution in this area ...
Panaretos, John +2 more
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Pareto Distribution-Based Shewhart Control Chart for Early Detection of Process Mean Shifts
Journal of Statistical Theory and Applications (JSTA)The Pareto distribution is of paramount importance in actuarial science, wealth distribution, finance, etc. This paper introduces a control chart inspired by Shewhart's methodology, designed for monitoring shifts in the Pareto distribution through a ...
Aamir Saghir +3 more
doaj +1 more source
New results for two-sided CUSUM-Shewhart control charts
, 2018 Already Yashchin (IBM J Res Dev 29(4):377–391, 1985), and of course Lucas (J Qual Technol 14(2):51–59, 1982) 3 years earlier, studied CUSUM chart supplemented by Shewhart limits. Interestingly, Yashchin proposed to calibrate the detecting scheme via P ∞ (
Knoth, Sven
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