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George Box and the 1.5-Sigma Shift

Posted 15th January 2010 at 03:51 PM by Jim Wynne
Updated 27th July 2010 at 10:32 PM by Jim Wynne
Some Related Topic Tags six sigma

This was prompted by a post by Miner, and in particular a paper he linked to on the 1.5-sigma shift by George Box and Alberto Luceño. It should be noted that the paper in question is dated 1999, and there is no immediate way of knowing whether or not...
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Total Variance Equation and process capability

Posted 10th January 2010 at 12:34 PM by bobdoering (Bob Doering)
Updated 13th January 2010 at 08:15 PM by bobdoering
Some Related Topic Tags nonnormal, normal, p vlaue, process capability

When determining process capability, you need to understand the sources of variation. What is the process, and what would one expect the distribution to be? Often the time-ordered run chart has as much to say about the distribution than just jumping...
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Gage Resolution Required for SPC!

Posted 12th November 2009 at 10:51 AM by bobdoering (Bob Doering)

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"...
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Intro to MSA of Continuous Data – Part 8: Comparison of Two Gages

Posted 19th September 2009 at 07:38 PM by Miner
Some Related Topic Tags measurement system analysis, msa

This is the eighth in a series of articles about MSA. The focus of this article will be on assessing the measurement reproducibility between two measurement systems that must measure the same characteristic.

Does the following scenario...
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Return to India

Posted 15th September 2009 at 12:28 PM by Howard Atkins (A typical city involved in a typical daydream)
Some Related Topic Tags india, israel, management, vegetarian

I have just returned from an ISO/TS 16949 audit in India.
This is not the first time I have been to India and as a vegetarian it is probably the best place for me to visit as I know that there is no problem with food. Usually my hosts are very...
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