Gage R&R Sample Size Considerations

ugurkavi

Registered Visitor
#1
Hi. I have been dealing with Measurement Systems Analysis for almost over a year now. There is a question bugging me for sometime now. It is the sample size we use for analysis. In most sources it says to take mostly 10 parts, however, what would be the reason behind this? Also, is there a way to calculate the required sample size for more accurate measurement systems analysis results? If any of you direct me to a source where I could find examples and explanation it would be greatly appreciated. Thanks :)
 
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Bev D

Heretical Statistician
Staff member
Super Moderator
#2
The sample size of 10 comes from a single root source. The sources you have read are simply repeating the original source...
There are other sources that recommend that your sample size by 30 parts measured twice.

You can construct confidence intervals for your estimates: you are essentially estimating the standard deviation of your measurement error and your observed variation. HOWEVER, since gage R&Rs are not an exact tool, this excercise is fairly nonvalue add.

I have found that 30 parts measured twice gives the most useful information. Others will have different experiences. Try some different sample sizes for yourself and see what they tell you.
 
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