نتایج جستجو برای: multivariate control charts

تعداد نتایج: 1444403  

In this paper a multivariate quality control procedure is offered in which several correlated stages are present in production systems and in each stage there are several correlated control variable. Using Hotelling's T2 statistic, first, each stage is tested for being out of control. Then out of control variables are selected using Murphy's method. The remainder of the research involves evalua...

2001
Willem Albers

Standard control chart practice assumes normality and uses estimated parameters. Because of the extreme quantiles involved, large relative errors result. Here simple corrections are derived to bring such estimated charts under control. As a criterion, suitable exceedance probabilities are used.

Journal: :Pakistan Journal of Statistics and Operation Research 2017

Journal: :The South African Journal of Industrial Engineering 2015

Journal: :Archives Animal Breeding 2009

Journal: :Journal of Statistical Software 2009

Journal: :Journal of the Royal Statistical Society: Series C (Applied Statistics) 2004

Journal: :Indian Journal of Science and Technology 2015

Control charts are powerful tools to monitor quality characteristics of services or production processes. However, in some processes, the performance of process or product cannot be controlled by monitoring a characteristic; instead, they require to be controlled by a function that usually refers as a profile. This study suggests employing exponentially weighted moving average (EWMA) and range ...

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