
This thread is carried over and continued in the Current Elsmar Cove Forums 
The New Elsmar Cove Forums 
The New Elsmar Cove Forums
Statistical Techniques and 6 Sigma derivation of gage R&R calculations

UBBFriend: Email This Page to Someone!  next newest topic  next oldest topic 
Author  Topic: derivation of gage R&R calculations 
marklee Lurker (<10 Posts) Posts: 3 
posted 31 July 2000 11:59 AM
Does anyone have a book or journal reference that shows how the formulas for gage R&R are developed? Specifically, where do the tables and other constants come from that are used in the Range and Average method of gage R&R. Anyone have worked examples comparing ANOVA method with Range and Average method? Thanks, Mark IP: Logged 
Don Winton Forum Contributor Posts: 498 
posted 31 July 2000 02:08 PM
If you go to: *** Dead Link Removed *** and find a link named 'Repeatability and Reliability" and download it. It should help. Regards, IP: Logged 
marklee Lurker (<10 Posts) Posts: 3 
posted 31 July 2000 03:34 PM
Don, Thanks for pointing me to your good tutorial. I have some more questions and comments after reading this through: 1. You refer to "Duncans's text", and it looks like it is described in a footnote which I can't see on my screen (pdf file bug?). Can you give me the name of this text by Duncan that you cite? 2. Repeatability is defined by 5.15*sigma_ev. I have assumed that gage R&R was using 6 sigma (99.7% compared to 99.0%)which would use 6.00*sigma_ev instead of 5.15. Thanks for clearing this up. 3. I can see that standand deviation and range would be related by a constant, but I still don't see where they come from. What are behind the estimations of the "d2" parameter in the equation sigma_ev = R_bar_bar / d2? Is there a For/Next loop that generates these? Thanks, Mark IP: Logged 
All times are Eastern Standard Time (USA)  next newest topic  next oldest topic 
Hop to: 
Your Input Into These Forums Is Appreciated! Thanks!