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Original Articles

Double sampling |S| control chart with variable sample size and variable sampling interval

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Pages 615-628 | Received 22 Sep 2016, Accepted 23 Jan 2017, Published online: 05 Jun 2017
 

ABSTRACT

This study presents a control chart for monitoring shifts in the covariance matrix of a multivariate normally distributed process. This chart combines the double sampling, variable sample size and variable sampling interval features, and is called the DSVSSI |S| chart. A Markov chain approach is developed to design the DSVSSI |S| chart, by minimizing the average time to signal (ATS), for a specified shift size in the covariance matrix. The DSVSSI |S| chart has a better ATS performance compared to other existing charts. An example is given to illustrate the operation of the DSVSSI |S| chart.

MATHEMATICS SUBJECT CLASSIFICATION:

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