Statistics Features

Michelle Paret's picture
Michelle Paret
I have two young children, and I work full-time, so my adult TV time is about as rare as finding a Kardashian-free tabloid. So I can’t commit to just any TV show. It better be a good one. I was...
Davis Balestracci's picture
Davis Balestracci
“When I die, let it be in a meeting. The transition from life to death will be barely perceptible.” —Anonymous Today I’m going to share some ideas from an always-thoughtful newsletter written by...
Douglas C. Fair's picture
Douglas C. Fair
Sponsored Content Statistical process control (SPC) software has been around for decades, used by manufacturers across industries to help monitor process behavior and control quality on the shop...
Eston Martz's picture
Eston Martz
I read trade publications that cover everything from banking to biotech, looking for interesting perspectives on data analysis and statistics, especially where they pertain to quality improvement...
William A. Levinson's picture
William A. Levinson
We all know what happens when we assume. For example, traditional designed experiments assume that residuals, the differences between the actual and modeled data, follow the normal distribution (as...
Jim Colton's picture
Jim Colton
How many samples do you need to be 95-percent confident that at least 95 percent—or even 99 percent—of your product is good? The answer depends on the type of response variable you are using—...
Eston Martz's picture
Eston Martz
Whatever industry you’re in, you’re going to need to buy supplies. If you’re a printer, you’ll need to purchase inks, various types of printing equipment, and paper. If you’re in manufacturing, you...
Scott A. Hindle's picture
Scott A. Hindle
When considering how good a production process is, it’s important to ask, “Can we expect the output to be fully conforming?” An assessment of process capability can answer this. Data are needed,...
Douglas Allen's picture
Douglas Allen
It’s a cold winter’s night in northern New Hampshire. You go out to the woodshed to grab a couple more logs, but as you approach, your hear a rustling inside the shed. You’ve gotten close enough to...
Donald J. Wheeler's picture
Donald J. Wheeler
Story update 9/8/2015: There was an error in the data set for columns "Skew" and "Kurt" in figure 7. The error has been corrected. Clear thinking and simplicity of analysis...
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...
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...
Donald J. Wheeler's picture
Donald J. Wheeler
While the computations for a process behavior chart are completely general and very robust, the secret to using a process behavior chart effectively lies in the art of rational sampling and...
John Flaig's picture
John Flaig
The classic version of FMEA is an engineering tool for quality and reliability improvement through project prioritization. It was formally released by the U.S. government with MIL-P-1629 in 1949...
Davis Balestracci's picture
Davis Balestracci
To celebrate Father’s Day in the United States (June 21 this year), I’m going to use this and my next column to honor my late dad by using a game he loved—golf—to teach some very basic statistics...
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...
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...