GAGE RR MINITAB SOFTWARE
In this article, the steps are reproduced using spreadsheet software with a case study as an example. However, it is important for analysts to understand what the statistical software is doing to make good sense of the report. Nevertheless, some statistics software such as Minitab or SigmaXL have a module called Attribute Agreement Analysis that does the same and much more, and this makes analysts’ lives easier. And there is really no need for sophisticated software. However, this depends on the application.Īlthough, gage R&R is based on two-proportion test, obtaining these percentages can be done with simple mathematics only. But generally, the rule of thumb is anything above 90 percent is quite adequate. Ideally, both percentages should be 100 percent. Most importantly, attribute gage R&R reveals two important findings – percentage of repeatability and percentage of reproducibility.
Reproducibility means that different operators, measuring the same thing, using the same gage, should get the same reading every time. Repeatability means that the same operator, measuring the same thing, using the same gage, should get the same reading every time. The gage R&R stands for repeatability and reproducibility. The tool used for this kind of analysis is called attribute gage R&R. Hence, it is important to quantify how well such measurement systems are working. One example is quality control inspectors using a high-powered microscope to determine whether a pair of contact lenses is defect free. However, such measurement systems exist throughout industries. This is because it is very difficult for all testers to apply the same operational definition of what is “good” and what is “bad.” Most problematic measurement system issues come from measuring attribute data in terms that rely on human judgment such as good/bad, pass/fail, etc. There will always be some measurement variation that is due to the measurement system itself.
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