منابع مشابه
EWMA Chart and Measurement Error
A Measurement error is a usually met distortion factor in real-world applications that influences the outcome of a process. In this paper, we examine the effect of measurement error on the ability of the EWMA control chart to detect out-of-control situations. The model used is the one involving linear covariates. We investigate the ability of the EWMA chart in the case of a shift in mean...
متن کاملCS-EWMA Chart for Monitoring Process Dispersion
Control charts are themost extensively used technique to detect the presence of special cause variations in processes. They can be classified intomemory andmemoryless control charts. Cumulative sum and exponentially weightedmoving average control charts are memory-type control charts as their control structures are developed in such a way that the past information is not ignored as it is done i...
متن کاملA 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 ...
متن کاملPerformance Comparisons of EWMA Control Chart Schemes
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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ژورنال
عنوان ژورنال: Journal of Applied Statistics
سال: 2004
ISSN: 0266-4763,1360-0532
DOI: 10.1080/02664760410001681738