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Industrial Statistics with Minitab by Xavier Tort-Martorell Llabres, Lluis Marco Almagro, Pere Grima Cintas

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19.4 Graphs of Means-Ranges

Stat > Control Charts > Variables Charts for Subgroups > Xbar-R

Choosing the options already used for the Xbar graph, one obtains:

nc19uf005.eps
The examples of control charts created on a set of data can give the false impression that the data are first taken and then, once all are collected, the graph is drawn. This is not the case. To rapidly react to the coming problems, the chart must be created as the data are being collected, point by point.

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