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Gage Resolution Required for SPC!

Posted 12th November 2009 at 10:51 AM by bobdoering
When considering the concept of what gage resolution is appropriate for SPC, we can benchmark some of the work from the automotive industry found in AIAG MSA (Measurement System Analysis)
3rd edition. It refers to the "10:1 rule of thumb" on page 43-44. They state that it can be considered a starting point, but that it "does not include any other element of the measurement system's variability." ndc (number of distinct categories) uses the gage study to generate statistically...
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Open Space meetings -- another great tool for collaboration

Posted 1st November 2009 at 04:07 PM by Panchobook
Updated 1st November 2009 at 04:32 PM by Panchobook
Have you ever been to a conference and came back thinking that your best interactions were at the coffee breaks and meals where you met surprisingly interesting folks at random?

Industry or interest group symposia typically involve sessions on subjects chosen by the organizers and delivered by knowledgeable presenters to a passive audience. The audience may have 5 to 15 minutes to lob questions at the end, and, of course, also has a chance to mingle informally at coffee breaks and...
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Inaccuracies in the Inconvenient Truth - TAT for TIT

Posted 17th October 2009 at 02:02 AM by Dr. L. Ramakrishnan
Updated 18th October 2009 at 11:36 PM by Dr. L. Ramakrishnan
I just came across this information on the inacccuracies in the acclaimed documentary "The Inconvenient Truth" (TIT) by Al Gore. No doubt, Al Gore raised mass awareness on Climate Change issues through this documentary. Al Gore deserves our admiration for the strong commitment he has for this common cause. No doubt, Climate Change is a Global issue.

A British Judge hearing a case on the documentary came out with the following eleven inaccuracies:

1.The...
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Congratulations Dr. Ramakrishnan

Posted 10th October 2009 at 07:57 AM by Dr. L. Ramakrishnan
Updated 16th October 2009 at 01:52 AM by Dr. L. Ramakrishnan
All budding and serious scientists believe that their work is of Nobel Prize quality. Now Dr. C.V. Ramakrishnan got the Nobel prize in Chemistry with two others, his dreams would have come true. Congratulations Dr. Ramakrishnan for this honour!!

I wish I had worked like you as a scientist towards this coveted goal.....but for me that was only a dream..being a mediocre scientist (of course, with a Gold Medal for the best Ph.D. thesis from the Indian Institute of Science, Bangalore,...
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Rating: 2 votes, 3.00 average.

The real point of the Central Limit Theorem?

Posted 23rd September 2009 at 09:41 AM by bobdoering
Updated 23rd September 2009 at 04:40 PM by bobdoering
We have pretty much given up on the using the central limit theorem to "prove" why SPC works, so, what does it really "prove"? One thought is that the larger the sample, the more the average masks the true distribution. This "sampling error" becomes more and more like the normal distribution. So, you could conclude that sampling error - like measurement error, e.g. - tends to be a normal distribution.

Cool, huh?
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