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  Statistical Techniques and 6 Sigma
  Gage R&R

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Author Topic:   Gage R&R
Tamashiro
Lurker (<10 Posts)

Posts: 4
From:Winnetka, CA, USA
Registered: Sep 98

posted 24 September 1998 10:09 PM     Click Here to See the Profile for Tamashiro   Click Here to Email Tamashiro     Edit/Delete Message   Reply w/Quote
I'm looking for a mathematical model which represents the R&R of an attribute defined product. Other than the representation offered in the AIAG manual, do you know of any statistical convention for analyzing the R&R of a measurement system which qualifies a product by attribute?

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Marc Smith
Cheech Wizard

Posts: 4119
From:West Chester, OH, USA
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posted 27 September 1998 01:23 PM     Click Here to See the Profile for Marc Smith   Click Here to Email Marc Smith     Edit/Delete Message   Reply w/Quote
I don't off hand, but Howard Atkins (one of the forum moderators) is pretty statistical. You might try shooting him an e-mail. I don't know that he stops by this forum much if at all. I might be wrong, though.

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Don Winton
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Posts: 498
From:Tullahoma, TN
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posted 28 September 1998 10:18 AM     Click Here to See the Profile for Don Winton   Click Here to Email Don Winton     Edit/Delete Message   Reply w/Quote
I do not know of an R&R study for attribute data. What I have used in the past, rather, was the model for process capability for attributes. You should be able to define the "process capability" of your gage using this methodology.

Process capability for attributes is defined as:

Capability % = 100*(1-((F+0.7)/N)

Where N is the number of tests and F is the number of failures (gage fails to detect nonconforming product or incorrectly identifies conforming as nonconforming).

Under the assumption the gage always functions correctly, then process capability can be determined by:

Capability % = 100*(0.5)^((1/(N+1))

Hope this helps, or was I completely off base?

Best Regards,

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Marc Smith
Cheech Wizard

Posts: 4119
From:West Chester, OH, USA
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posted 28 September 1998 07:54 PM     Click Here to See the Profile for Marc Smith   Click Here to Email Marc Smith     Edit/Delete Message   Reply w/Quote
Thanx for the detailed response, Don. Not my specialty...

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Don Winton
Forum Contributor

Posts: 498
From:Tullahoma, TN
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posted 28 September 1998 08:40 PM     Click Here to See the Profile for Don Winton   Click Here to Email Don Winton     Edit/Delete Message   Reply w/Quote
Not a problem, Marc. Anything I can do to help. Before I started ISO stuff, I was a quality engineer in Florida for 10 years. If I do not know it, I may be (may not be) able to find it. I still have a lot of that stuff laying around and will keep an eye on this forum for ya. All for now. Gotta go.

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