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   Ben Lee New Member

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   Hi Everyone,
   
   The gage R and R is a bit not intuitive. Can anyone explain how to derive the formula e.g. EV = mean of Range x K1. What is this constant K1 and how to derive that? why do we need to multiply by a constant when we already got the range average?
   
   Other formulas such as AV too.
   
   Thank you.

    

   Ben Lee, May 29, 2022

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   Andy Nichols Moderator Staff Member

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   One of our statistic whizzes will be along shortly. Please hold the line...

    

   Andy Nichols, May 30, 2022

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   Miner Moderator Staff Member

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   There is a decent explanation here at a sister forum (see post #10).
   
   Essentially, K1 = 1/d2. Next, you will probably ask where the unbiasing constant, d2 came from, so refer to this article from Minitab.

    

   Miner, May 31, 2022

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   Bev D likes this.

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