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A new chart based on sample variances for monitoring the covariance matrix of multivariate processes
(Springer London Ltd, 2009-04-01)
In this article, we propose a control chart for detecting shifts in the covariance matrix of a multivariate process. The monitoring statistic is based on the standardized sample variance of p quality characteristics we ...
A new chart based on sample variances for monitoring the covariance matrix of multivariate processes
(Springer London Ltd, 2009-04-01)
In this article, we propose a control chart for detecting shifts in the covariance matrix of a multivariate process. The monitoring statistic is based on the standardized sample variance of p quality characteristics we ...
An adaptive chart for monitoring the process mean and variance
(Wiley-Blackwell, 2007-11-01)
Traditionally, an (X) over bar chart is used to control the process mean and an R chart is used to control the process variance. However, these charts are not sensitive to small changes in the process parameters. The ...
A synthetic control chart for monitoring the process mean and variance
(2006-04-10)
Purpose - The aim of this paper is to present a synthetic chart based on the non-central chi-square statistic that is operationally simpler and more effective than the joint X̄ and R chart in detecting assignable cause(s). ...
The Synthetic Control Chart Based on Two Sample Variances for Monitoring the Covariance Matrix
(John Wiley & Sons Ltd, 2009-07-01)
In this article, we propose a new statistic to control the covariance matrix of bivariate processes. This new statistic is based on the sample variances of the two quality characteristics, in short VMAX statistic. The ...
The Synthetic Control Chart Based on Two Sample Variances for Monitoring the Covariance Matrix
(John Wiley & Sons Ltd, 2009-07-01)
In this article, we propose a new statistic to control the covariance matrix of bivariate processes. This new statistic is based on the sample variances of the two quality characteristics, in short VMAX statistic. The ...
An adaptive chart for monitoring the process mean and variance
(Wiley-Blackwell, 2014)
A Single Statistic for Monitoring the Covariance Matrix of Bivariate Processes
(TAYLOR & FRANCIS INCPHILADELPHIA, 2012)
In this article, we present a new control chart for monitoring the covariance matrix in a bivariate process. In this method, n observations of the two variables were considered as if they came from a single variable (as a ...