Tag Archives: control chart

George Box Webcast on Statistical Design in Quality Improvement

Posted on June 11, 2014 by John Hunter

George Box lecture on Statistical Design in Quality Improvement at the Second International Tampere Conference in Statistics, University of Tampere, Finland (1987). Early on he shows a graph showing the problems with American cars steady over a 10 years period. Then he overlays the results for Japanese cars which show a steady and significant decline of the same period. Those who didn’t get to see presentations before power point also get a chance to see old school, hand drawn, overhead … Continue reading →

Posted in Creativity, Data, Innovation, Management, Process improvement, Psychology, Quality tools, Science, Statistics | Tagged , , , , , , , , , , , ,

The Art of Discovery

Posted on April 18, 2013 by John Hunter

Quality and The Art of Discovery by Professor George Box (1990): Quotes by George Box in the video: “I think of statistical methods as the use of science to make sense of numbers” “The scientific method is how we increase the rate at which we find things out.” “I think the quality revolution is nothing more, or less, than the dramatic expansion of the of scientific problem solving using informed observation and directed experimentation to find out more about the … Continue reading →

Posted in Creativity, Data, Innovation, Management, Process improvement, Quality tools, Science, Statistics | Tagged , , , , , , , , , , , , , | 4 Comments

Special Cause Signal Isn’t Proof A Special Cause Exists

Posted on October 3, 2012 by John Hunter

One of my pet peeves is when people say that a point outside the control limits is a special cause. It is not. It is an indication that it likely a special cause exists, and that special cause thinking is the correct strategy to use to seek improvement. But that doesn’t mean there definitely was a special cause – it could be a false signal. This post relies on an understand of control charts and common and special causes (review … Continue reading →

Posted in Data, Deming, Management, Manufacturing, Process improvement, Quality tools, quote, Six sigma, Statistics, Systems thinking | Tagged , , , , , , , , ,

Worth Does Not Equal Wealth

Posted on November 11, 2010 by John Hunter

Warren Buffet often says he happens to be very good at something that is very financially rewarding – effectively allocating capital. He says this while making the point that plenty of other people are exceptionally gifted in ways that are not as financially rewarding (teachers, grandparents, nurses, Peace Corps assignment…) but are important to society. He understands that his worth as a person is not tied to this bank account. It might be one reason he and Bill Gates have … Continue reading →

Posted in Psychology, Respect | Tagged , , , , , ,

Nice Non-technical Control Chart Webcast

Posted on April 28, 2010 by John Hunter

This very brief introduction to control charts by PQ Systems provides a very watchable non-technical overview. Getting people to understand variation is important, and not easy. This video is one more quick reminder for those still trying to incorporate an understanding of variation into their view of the world. The idea is simple. But actually thinking with an understanding of variation people find difficult, it seems to me. It is very easy to continue to revert to special cause thinking … Continue reading →

Posted in Deming, Management, Process improvement, Quality tools, Systems thinking, webcast | Tagged , , , , , , | 1 Comment

Red Bead Experiment Webcast

Posted on April 22, 2009 by John Hunter

Dr. Deming used the red bead experiment to present a view into management practices and his management philosophy. The experiment provides insight into all four aspects of Dr. Deming’s management system: understanding variation, understanding psychology, systems thinking and the theory of knowledge. Red Bead Experiment by Steve Prevette Various techniques are used to ensure a quality (no red bead) product. There are quality control inspectors, feedback to the workers, merit pay for superior performance, performance appraisals, procedure compliance, posters and … Continue reading →

Posted in Data, Deming, Education, Management, Performance Appraisal, Psychology, quote, Respect, webcast | Tagged , , , , , , , , , , , | 3 Comments

Epidemic of Diagnoses

Posted on January 3, 2007 by John Hunter

What’s Making Us Sick Is an Epidemic of Diagnoses by Dr. Welch, Dr. Schwartz and Dr. Woloshin: For most Americans, the biggest health threat is not avian flu, West Nile or mad cow disease. It’s our health-care system. True, and probably the biggest economic threat too. See: Deming’s Seven Deadly Diseases and Health Insurance Premiums Soar Again. But it also leads to more diagnoses, a trend that has become an epidemic. This epidemic is a threat to your health. It … Continue reading →

Posted in Deming, Health care, Management, Process improvement, Psychology, Quality tools | Tagged , , , , , | 4 Comments

SPC: History and Understanding

Posted on September 23, 2005 by John Hunter

SPC: From Chaos To Wiping the Floor [broken link removed 🙁 it will be nice when sites start to realize breaking links is not acceptable] by Lynne Hare (who also was the 1997 Hunter Award winner) Shewhart based control chart limits more on the economics of change than on underlying probabilities. Ever the empiricist, Shewhart seems not to have trusted probability limits alone. Setting control limits at 3 standard deviations is a decision based on experience. Shewhart, Deming and others … Continue reading →

Posted in Management, Statistics | Tagged , , , , | 1 Comment

Managing with Control Charts

Posted on August 25, 2005 by John Hunter

Ideas from the Tiger’s Head by Simon Caulkin, The Observer. This is a remarkably nuanced short article on control charts given that it is a newspaper article (which normally overly simplify such concepts to the point not much of value is left). This is a critical distinction: if managers mistakenly tamper with a stable process, believing an occurrence is exceptional, they introduce an external cause, which destabilises it. Targets do the same thing. If a system is stable, as a … Continue reading →

Posted in Deming, Management, Statistics | Tagged , | 2 Comments

Control Charts in Health Care

Posted on February 26, 2005 by John Hunter

This post is an edited version of a message I sent to the Deming Electronic Network. I find the “control charts in health care” thread quite interesting. From Mike Woolbert’s post [link broken, so I removed it] > I have read many comments about the 8 minute ambulance trip. > This doesn’t seem to be a system measure, but a result measure. It seems to me the 8 minute (90% of the time) measure is an attempt at a process … Continue reading →

Posted in Data, Deming, Health care, Management, Quality tools, Statistics | Tagged , , , , , , , , | 3 Comments