Joint X and R Charts with Two Stage Samplings

Abstract

When joint X and R charts are in use, samples of fixed size are regularly taken from the process, and their means and ranges are plotted. This article proposes to perform the sampling in two stages. At first stage, one item of the sample is inspected. If its X value is close to the target the sampling is interrupted, otherwise the sampling goes on to the second stage, when the X and R values are computed taking into account the whole sample. Appropriate devices, such as go-no-go gauges, can be used to decide if the sampling should go on to the second stage.

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Cite this paper

@inproceedings{Costa2002JointXA, title={Joint X and R Charts with Two Stage Samplings}, author={Antonio Fernando Branco Costa and Ariberto P. da Cunha and M. A. Rahim}, year={2002} }