Title

Moving Range and R Charts

Document Type

Contribution to Book

Publication Date

1-1-2007

Publication Title

Encyclopedia of Statistics in Quality and Reliability

DOI

10.1002/9780470061572.eqr250

ISBN

9780470061572

Abstract

Control charts for controlling the process mean are affected by changes in the process standard deviation. Therefore it is important to also control the process standard deviation. Various control charting methods have been developed for this purpose. Two commonly recommended statistical methods for controlling the process standard deviation are the moving range (MR) and the range (R) charts. The designs of MR and R charts are discussed in this article and each is illustrated with an example.

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