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  Statistical Techniques and 6 Sigma
  derivation of gage R&R calculations

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Author Topic:   derivation of gage R&R calculations
marklee
Lurker (<10 Posts)

Posts: 3
From:seattle
Registered: Jul 2000

posted 31 July 2000 11:59 AM     Click Here to See the Profile for marklee   Click Here to Email marklee     Edit/Delete Message   Reply w/Quote
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

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Don Winton
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Posts: 498
From:Tullahoma, TN
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posted 31 July 2000 02:08 PM     Click Here to See the Profile for Don Winton   Click Here to Email Don Winton     Edit/Delete Message   Reply w/Quote
If you go to:

*** Dead Link Removed ***

and find a link named 'Repeatability and Reliability" and download it. It should help.

Regards,
dWizard

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marklee
Lurker (<10 Posts)

Posts: 3
From:seattle
Registered: Jul 2000

posted 31 July 2000 03:34 PM     Click Here to See the Profile for marklee   Click Here to Email marklee     Edit/Delete Message   Reply w/Quote
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

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