Control Charts (@)
A Simple Model of a Variance Stable Process
Most fairly accurate descriptions of equipment and/or process lifetimes assume that failure rates follow a three period I II III bath tub curve pattern where failures / errors decrease during the debugging or improvement time period, remain relatively constant and at their lowest levels during the normal equipment or process operating period, and increase during the wearout time period. From John J. Hickey and iSixSigma.
How Do I Compute Standard Deviation? Let Me Count the Ways
There are several ways to compute the standard deviation. Here are the pros and cons of each. From Quality Digest, written by Thomas Pyzdek.
Process Versus Sampling Variation
Make sure you eliminate sampling variation to understand the true process variation. From Colorado State University.
The Importance of Statistical Thinking
Six Sigma as an effective way to implement statistical thinking, a philosophy of learning and action based on the following fundamental principles: All work occurs in a system of interconnected processes; Variation exists in all processes; Understanding and reducing variation are the keys to success. This article displays two case studies that illustrate that there is no set rule to understanding variation based on the order of Six Sigma tools used. Six Sigma Black Belts need to understanding when to use each tool in business projects. From Shree Phadnis.
Understanding Process Variation
Conformance to customer CTQs can be measured in process variation and is important in the Six Sigma methodology, because the customer is always evaluating our services, products and processes to determine how well they are meeting their needs. From Charles Waxer and iSixSigma.
Understanding Process Variation
A marketing person asks why variation is so important. The dialogue helps everyone understand with an example you can relate to. From the iSixSigma Discussion Forum.
Variation - The Root Of All Process Evil
Learn how to evaluate and eliminate variation in your business processes using a range of statistical tools and formulas. From iSixSigma.
Variation and Accuracy
This paper discusses the vital concepts of variation and accuracy, and how they relate to a manufacturing process. From Ganesha.
Variation and Your Health
Should doctors focus on the immediate issues or the trends? Why variation is a key issue in the medical industry. From Quality Digest, written by Thomas Pyzdek.
What Is A Stable Process?
Process stability is one of the most important concepts of any quality improvement methodology. Stable processes involve achieving consistent and, ultimately, higher process yields through the application of an improvement methodology. Learn more about stability. From iSixSigma.
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