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

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13.6 Gage R&R Study for the Data in File ‘RR_NESTED’

In this case, the adequate approach is a nested design since each operator measures only a subset of the parts. Thus, go to: Stat > Quality Tools > Gage Study > Gage R&R Study (Nested).

nc13uf011.eps

Gage Info and Options: Clicking on them open up identical dialog boxes to those produced in case of a crossed design. Likewise, the output displayed in the session window has the same structure as that of previous designs.

With these data, the following graph is constructed:

nc13uf012.eps

It can be observed that the variability between parts (Part-by-Part) is very small as compared with the one of the measurement system (Gage R&R), which indicates a nonappropriate measurement system.

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