May 15, 2009 · The EWMA chart for the standard deviation is a useful tool for monitoring the variability of a process quality characteristic.
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Feb 21, 2018 · In this paper we propose using an EWMA based on the log transformation of the sample variance. Properties of this EWMA are given and an optimal design strategy ...
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A modified EWMA control chart is proposed for monitoring the standard deviation when the parameters are estimated. The Run Length properties of this chart are ...
A modified EWMA control chart is proposed for monitoring the standard deviation when the parameters are estimated. The Run Length properties of this chart are ...
A modified EWMA control chart is proposed for monitoring the standard deviation when the parameters are estimated. The Run Length properties of this chart are ...
A modified EWMA control chart is proposed for monitoring the standard deviation when the parameters are estimated. The Run Length properties of this chart are ...
TL;DR: A modified EWMA control chart is proposed for monitoring the standard deviation when the parameters are estimated from an in-control Phase I data set.
A modified EWMA control chart is proposed for monitoring the standard deviation when the parameters are estimated from an in-control Phase I data set.
The EWMA - Exponentially Weighted Moving Average chart is used to monitor variables that make use of the entire history of a given output.
9.8 Estimating σ for a EWMA chart. • If unknown, the process standard deviation σ must be estimated from the data. In SAS, σ is estimated for the EWMA chart ...