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Gage R&R Execution and Analysis
There are best practices for executing the Gage R&R Study plan and best practices for how to approach the analysis. In addition, there are target performance thresholds for the analysis results.
When to use
The Gage R&R execution best practices should be applied once the Data Collection phase begins. The analysis best practices start at the time of data collection to ensure that the data is measured and recorded correctly. They also apply once the calculation results are completed.
Execution Best Practices
The obvious best practice is to follow the Gage R&R Study plan. With regards to data collection, the first appraiser should evaluate all items one time in a random order. The second appraiser evaluates all the items once in a random order and this pattern continues for all appraisers. Once all appraisers have completed their first measurement on all items, the first trial is complete. This process is then repeated for the second trial. The random order for each appraiser is changed for each trial.
The data recording is the most common area of mistakes. Use the form or format of the study plan to ensure that the correct value is recorded for the correct appraiser, item and trial.
Analysis Best Practices
The analysis best practices can actually begin as soon as data collection starts. That is because one of the best practices is to ensure the appraisers are following the plan and data is recorded correctly. This is done as an audit or assessment of the process. The actual calculation for determining repeatability or reproducibility cannot be started until all data has been collected. The calculation approach is different for variable and attribute data and the results are expressed in different terms. But what is the same, is that if the results are unacceptable, the process needs to be improved or a different measurement system needs to be used for that application.
The target performance levels for both types of studies are shown below.
Hints & tips
- Before starting the study, do a “pilot run” of the measurement process and the data recording.
- If the appraisers are not familiar with the Gage R&R process, spend some time with them before they start to inspect to answer their questions and build their confidence in the process.
- If you are collecting data in Excel but intend to analyze with Minitab, record your data in a column and it can then be copied and pasted into Minitab.
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