This is the final column in the debate between Donald Wheeler and Forrest Breyfogle on whether or not to transform data prior to analysis. Because the debate started with Wheeler's article "Do ... [Read More]

A previous article of mine in this newsletter, “NOT Transforming the Data Can Be Fatal to Your Analysis,” addressed the need for appropriate transformations and a predictive performance ... [Read More]

If you have been following my articles over the last few months, you have seen that even though statistical process control (SPC) charts are very powerful tools for examining a process, it turns ... [Read More]

 Story update 9/23/09: Reference to 9.5.2.f was changed to 8.5.2.f in second paragraph. As more suppliers are required by their regulators and customers to achieve ISO 9001 certification, and ... [Read More]

Is the theory of constraints compatible with lean thinking and can the two approaches be used together? This article looks at some of the similarities and differences between the two approaches and ... [Read More]

Not surprisingly, there was controversy over Forrest Breyfogle's article, "Non-normal Data: To Transform or Not to Transform," written in response to Donald Wheeler’s article "Do ... [Read More]

“Writing is not a job; it’s a hobby!” thundered my father when I told him my plans for college. “You need to get a profession: Medicine, law, engineering, or accounting.”  I ... [Read More]

Following my article on Leptokurtophobics (Do You Have Leptokurtophobia?) it was almost inevitable that we should hear from one. We were fortunate to have someone as articulate as Forrest Breyfogle ... [Read More]

The band “Chicago” sang those words about "time" decades ago. The second line “Does anybody really care?” seems to sum up what is still in vogue today, especially in the ... [Read More]

Story update 8/24/2009: The original graphics for this story were missing key data due to errors in converting them. We have fixed the problem.   I n “Do You Have ... [Read More]