Robust point location estimators for the EWMA control chart
نویسندگان
چکیده
منابع مشابه
A Directional Multivariate Sign EWMA Control Chart
In many applications the shift directions of observation vectors are limited, which allows focusing detection power on a limited subspace with improved sensitivity. This paper develops a new multivariate nonparametric statistical process control chart for monitoring location parameters, which is based on integrating a directional multivariate spatial-sign test and exponentially weighted moving ...
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Combining an EWMA chart with a Shewhart chart is traditionally recommended as a means of providing good protection against both small and large shifts in the process mean. Capizzi and Masarotto have proposed an EWMA chart with a variable smoothing constant (AEWMA) for the same purpose. In this paper, we optimize the designs of the AEWMA and of the combined EWMA-Shewhart schemes with regard to p...
متن کاملA Multivariate Sign EWMA Control Chart
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متن کاملThe Robustness of the Multivariate EWMA Control Chart
Control charts are graphical tools widely used to monitor manufacturing processes to quickly detect any change in a process that may result in a change in product quality. The statistic plotted on a control chart is based on samples of n ≥ 1 observations (rational subgroups) that may be taken at regular sampling intervals. However, there are numerous practical applications using individual obse...
متن کاملOne-sided EWMA control chart for monitoring high yield processes
A one-sided Exponential Weighted Moving Average (EWMA) control chart is introduced to monitor the fraction p of nonconforming products in high yield processes. It is designed to detect upward shifts of p screening the non-transformed geometric counts i.e. the number of conforming products between two nonconforming ones. Its algorithmic function is theoretically established and numerous performa...
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ژورنال
عنوان ژورنال: Quality Technology & Quantitative Management
سال: 2016
ISSN: 1684-3703
DOI: 10.1080/16843703.2016.1139845