Six Features

Eston Martz's picture
Eston Martz
Statisticians say the darnedest things. At least, that’s how it can seem if you’re not well-versed in statistics. When I began studying statistics, I approached it as a language. I quickly noticed...
Gorur N. Sridhar's picture
Gorur N. Sridhar
Quality and Six Sigma are often considered as links in a chain. For example, when quality is poor, many times the immediate response is, “Let’s improve it using Six Sigma.” But does Six Sigma...
Joel Smith's picture
Joel Smith
Just 100 years ago, very few statistical tools were available and the field was largely unknown. Since then, there has been an explosion in available tools, as well as ever-increasing...
John Flaig's picture
John Flaig
I have discussed the economics of project management numerous times in presentations all over the country, and based on the response to my message, I have to conclude that many people just don...
Donald J. Wheeler's picture
Donald J. Wheeler
Some commonly held ideas about skewed probability models are incorrect. These incorrect ideas are one source of complexity and confusion regarding the analysis of data. By examining the basic...
Quality Transformation With David Schwinn's picture
Quality Transformation With David Schwinn
This month’s column was prompted by an especially thoughtful commencement address by Michael Ward, reproduced in the May/June 2015 issue of Imprimis (Hillsdale College). Ward, of course, encouraged...
Eston Martz's picture
Eston Martz
If you’ve read the first two parts of this tale, you know it started when I published a post that involved transforming data for capability analysis. When an astute reader asked why Minitab didn‘t...
Eston Martz's picture
Eston Martz
In my last post, I told you how I had double-checked the analysis in a post that involved running the Johnson transformation on a set of data before doing normal capability analysis on it. A reader...
Eston Martz's picture
Eston Martz
I don’t like the taste of crow, which is a shame, because I’m about to eat a huge helping of it. I’m going to tell you how I messed up an analysis. But in the process, I learned some new...
Joel Smith's picture
Joel Smith
Last month, the ESPN series Outside the Lines reported on baseball pitchers suffering serious injuries from being struck in the head by line drives, and the efforts that Major League...
Davis Balestracci's picture
Davis Balestracci
This is a continuation of my last column, which I’ve written to honor my late dad who loved golf. As promised, let’s look at the Masters golf tournament final four-round scores for the 55 players...
Matthew E. May's picture
Matthew E. May
No, this isn’t an opinion piece or in any way a critique. It’s more like a public service announcement for business professionals in the job market, looking for a strategy position with a market...
Quality Transformation With David Schwinn's picture
Quality Transformation With David Schwinn
“If we are to achieve a richer culture, rich in contrasting values, we must recognize the whole gamut of human potentialities, and so weave a less arbitrary social fabric, one in which each diverse...
Brian Maskell's picture
Brian Maskell
T here are three ways in which a standard costing system is typically used in a manufacturing company: 1. Performance measurement 2. Decision making 3. Inventory valuation From an accounting...
Fred Schenkelberg's picture
Fred Schenkelberg
Control charts provide an ongoing statistical test to determine if a recent reading or set of readings represents convincing evidence that a process has changed from an established stable...
Patrick Runkel's picture
Patrick Runkel
I’ve never understood the fascination with selfies. Maybe it’s because I'm over 50. After surviving the slings and arrows of a half a century on Earth, the minute or two I spend in front of the...
Bruce Hamilton's picture
Bruce Hamilton
The last few weeks for me have been all things Shingo, including a presentation at the Shingo Institute’s International Conference three weeks ago in Provo, Utah, followed by four days of Shingo...
Patrick Runkel's picture
Patrick Runkel
It’s usually not a good idea to rely solely on a single statistic to draw conclusions about your process. Do that, and you could fall into the clutches of the “duck-rabbit” illusion shown below. If...
Brian Maskell's picture
Brian Maskell
It is vitally important for lean people to know nothing when working on improvement. This sounds like a crazy idea, but it is another 100-percent turnaround from traditional management thinking....
Rip Stauffer's picture
Rip Stauffer
Recently, in one of the many online discussion groups about quality, Six Sigma, and lean, this question was posed: “Can X-bar R and X-bar S be used interchangeably based on samples size (n) if the...