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%GRR on variability data

Here is the screenshot of jmp sample data , Wondering which is the correct GRR% .I think 49.75 is from Average- range method calculation and 24.76 is from anova method calculation. can anyone help me to understand

Screen Shot 2020-09-19 at 1.40.10 PM.png

Re: %GRR on variability data

All I see in your screen shot is a red and gray triangle.

Re: %GRR on variability data

As already stated, your screen shot is incomplete. I will comment on the differences between the R-bar/d2 and typical estimation of standard deviation (s)...the R-bar method first tests the integrity of the data with respect to outliers (special cause) using a range chart (or MR chart). The typical estimation performs no such test and can, therefore, be biased due to the outlier data point.

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