Necessary Measures

Abstract:Common gage repeatability and reproducibility (R&R) assess the effects of two factors — operator and part — on variation in a measurement system. For some systems, however, the effects of operator and part are not enough to provide a complete understanding of the measurement. Adding a third variable to the standard study, commonly the gage, is often required. When three or more factors are involved in the analysis, the study is known as an expanded gage R&R. Often, an expanded gage R&R is necessary to properly assess the measurement system. This article discusses four main differences between a standard and expanded gage R&R study. It also explains how modify sampling plans in expanded gage R&R to produce more manageable sample sizes. The article presents an expanded gage R&R case study focusing on a company that manufactures products that help customers measure and better understand the renewable energy resources that serve the wind and solar energy …

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Excellent article. I was looking for this solution. Readily applicable to a common problem I have in my line of work.
--Asheque Yusuf, 12-07-2014

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