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Transformation of Weibull Distributed Data: A Surprising Result (Forrest's newsletter)



..In this issue of eSmarter News: Transformation of Weibull Distributed Data: A Surprising Result
October 27, 2011, Edition I

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Transformation of Weibull Distributed Data: A Surprising Result

Transformation of process data to achieve normality seems like magic, but it is not. There are a lot of reasons that specific transformations make sense and should be used, such as a lognormal transformation of standard deviations and of time data.

But, when it comes to the Weibull distribution, there is no logical or inferential information that provides any guidance on a transformation to normality, until now. Rick Haynes has found a relationship between the Weibull distribution parameters and the optimal Box-Cox transformation lambda value.

Through the use of the @Risk simulation program and Minitab, this article walks through the generation of an equation to predict a lambda value.

Read more...






Quality Digest video on Quality Profession enhancements
Written by Forrest W. Breyfogle, III

Last week Quality Digest interviewed me on video when I was in Chicago to speak at the QualityExpo conference.

During the video we discussed what Quality professionals could do to take the profession to its next level, avoiding the often frequent laying-off of improvement specialists when times get tough.

Read more...

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Practitioner's Toolbox
Time Series Analysis: Missing from Lean Six Sigma training?
Written by Rick Haynes

I am working with a client that is trying to develop an evaluation system for its teachers. The goal is to use student test scores as part of the teacher evaluation. The concept is valid, of course, but how do you weight that input as a measure of the teacher skill?

Schools are a unique environment to apply process improvement and assessment tools. The student test scores come out once per year. There is no repeat data, because the next student test is over different material in the next grade. Think about a manufacturing process that runs for 9 months and gets only 20 data points (one per unit in the batch) from a classroom of different types of units (students). It would never work.

The current thought, in the education system, is to measure the year-to-year growth of the student in the testing as compared to national standards of performance. It is an estimate of the knowledge growth in a year of school. Did the student gain more than one year of learning in a year. It sounds great, but is it valid?

Read More...

 


 

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Become an expert and simplify your job with 175+ articles, whitepapers, presentations, how-to guides, videos, and other time-saving tools. Sign In or Sign Uptoday! In the mean time, read the latest asset:

Lean's Integration in an Enhanced Business Management System

Lean's Integration in an Enhanced Business Management System

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Lean has a very good tool set; however, it is not a business management system. Practitioners may work with process improvement tools in organizational silos that often have little, if any, positive impact on the big picture. The Integrated Enterprise Excellence system addresses this need for overall orchestration of business operations with process improvement efforts. This article discusses how lean tools are integrated within the IEE system.

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With further elaboration on the shortcomings of traditional systems and the details of an IEE implementation, each volume builds upon one another so organizations develop a true appreciation and understanding of IEE benefits and its implementation.


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