Six Features

Mike Micklewright's picture
Mike Micklewright
You and your spouse go out to dinner to your favorite restaurant, on a “date” no less, to celebrate a big anniversary. You have been looking forward to this evening all week, and after a long...
Davis Balestracci's picture
Davis Balestracci
My last article demonstrated a common incorrect technique—based in “traditional” statistics—for comparing performances based on percentage rates. This article will use the same data to show...
Steve Moore's picture
Steve Moore
Up until a few years ago, I wasn’t a big fan of run charts. Why not just go ahead and construct a process behavior chart and move on? Well, sometimes a run chart is more appropriate for certain...
Patrick Runkel's picture
Patrick Runkel
The word “kurtosis” sounds like a painful, festering disease of the gums. But the term actually describes the shape of a data distribution. Frequently, you’ll see kurtosis defined as how sharply “...
Quality Transformation With David Schwinn's picture
Quality Transformation With David Schwinn
Shortly after the death of the brilliant comedian and actor Robin Williams, his daughter Zelda quit Twitter and Instagram following online harassment over his death. How sad. We seem to somehow...
Jim Frost's picture
Jim Frost
In a previous article, I showed why there is no R-squared for nonlinear regression. Anyone who uses nonlinear regression will also notice that there are no P values for the predictor variables....
Davis Balestracci's picture
Davis Balestracci
My last column, “Dealing With Count Data and Variation,” showed how a matrix presentation of stratified count data could be quite effective as a common-cause strategy. I’ll use this column to...
Akhilesh Gulati's picture
Akhilesh Gulati
An important concept within TRIZ is that someone, somewhere, has already solved your current problem. In other words, they have “been there, done that.” Or course, the problem has to be clearly...
Bob Emiliani's picture
Bob Emiliani
The lean community continues to face a problem that hurts efforts to advance progressive lean management: It is the great difficulty in clearly separating and effectively communicating the...
Arun Hariharan's picture
Arun Hariharan
On a recent visit to Japan, I had an opportunity to visit Toyota’s headquarters. During a meeting with some of its top executives, I asked one of them what role the senior leadership played in...
Joel Smith's picture
Joel Smith
Learning to ride a bike is a rite of passage for any kid, so much so that we even use the expression “taking the training wheels off” for all kinds of situations. We say it to mean that we are...
Quality Transformation With David Schwinn's picture
Quality Transformation With David Schwinn
Last evening my wife, Carole, and I attended a celebratory dinner for the family of one of my former students. Luca, my student, originally from Italy, brought his wife, Olivia, and his young...
Patrick Runkel's picture
Patrick Runkel
If you teach statistics or quality statistics, you’re probably already familiar with the cuckoo egg data set. The common cuckoo has decided that raising baby chicks is a stressful, thankless job....
Gary Phillips's picture
Gary Phillips
For decades now, the measurement systems analysis (MSA) approach has been the predominant method for evaluating measurement systems capability. Although this method is widely considered to be...
Donald J. Wheeler's picture
Donald J. Wheeler
One of the common tools of quality assurance is acceptance sampling. Acceptance sampling uses the observed properties of a sample drawn from a lot or batch to make a decision about whether to...
Joel Smith's picture
Joel Smith
In part 1, part 2, and part 3, we shared our blind wine-tasting experiment, the survey results, and the experimental results, respectively. To wrap things up, we’re going to see if the survey...
Joel Smith's picture
Joel Smith
In part 1 of “Blind Wine,” we introduced our blind wine-tasting experimental setup, which included some survey questions asked ahead of time of each participant. In part 2 we looked at the results...
Joel Smith's picture
Joel Smith
In part 1, we introduced our blind wine-tasting experimental setup, which included some survey questions asked ahead of time of each participant. The four questions asked were: 1. On a scale of...
Davis Balestracci's picture
Davis Balestracci
I was teaching a class and asked participants to create a control chart of an indicator that was important to them. A lab supervisor presented me with a chart on the number of procedures her...
Joel Smith's picture
Joel Smith
Already relaxed on his first day in Napa, Brutus and his wife, Suzy, decide to visit their favorite winery just before lunch to taste its new Cabernet Sauvignon. The owner recognizes them as they...