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Gage R&R

**Gage R&R **is the type of Measurement System Analysis (MSA) that is used to quantify how well a variable (continuous) measurement system is working.

Xbar-R

**Xbar-R** (Mean and Range) is a pair of control charts primarily used in Statistical Process Control (SPC) for variable (or continuous) metric when samples are collected at regular intervals from a process. It is a preferred option when the sample size is between 2 and 8. The Range chart helps understand the process variation (and hence is the first chart that is reviewed) while the Xbar chart helps understand the process center. The process is said to be stable only if both the Range and Xbar charts are in control

An application-oriented question on the topic along with responses can be seen below. The best answer was provided by

Amlan Dutta on 12th June 2019.

Applause for all the respondents- Amlan Dutta, Natwar Lal.

Also review the answer provided by Mr Venugopal R, Benchmark Six Sigma's in-house expert.

## Question

## Rupinder N 31

Q. 167

While analyzing the XBar R Chart in Gage R&R Output, a sound measurement system will have more than 50% of the data points falling outside of the control limits. It is intuitively the reverse of what we want to see (data points to be inside the control limits for a well controlled process). Explain this seeming aberration.Note for website visitors- Two questions are asked every week on this platform. One on Tuesday and the other on Friday.All questions so far can be seen here - https://www.benchmarksixsigma.com/forum/lean-six-sigma-business-excellence-questions/Please visit the forum home page at https://www.benchmarksixsigma.com/forum/ to respond to the latest question open till the next Tuesday/ Friday evening as per Indian Standard Time.The best answer is always shown at the top among responses and the author finds honorable mention in our Business Excellence dictionary at https://www.benchmarksixsigma.com/forum/business-excellence-dictionary-glossary/ along with the related term.## Link to post

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