Statistics Features

Joel Smith's picture
Joel Smith
‘You take 10 parts and have three operators measure each two times.” This standard approach to a gage repeatability and reproducibility (GR&R) experiment is so common, so accepted, so...
Fred Faltin's picture
Fred Faltin
All of us draw conclusions based on what we see happening around us. Often what we’re observing is a sample from some larger population of events, and we draw inferences based on the sample without...
Donald J. Wheeler's picture
Donald J. Wheeler
Here we take a serious look at some nonsensical ideas about capability ratios. Following a quick review of predictability and capability and a brief discussion of the traditional ways of...
Steve Moore's picture
Steve Moore
When I entered college in the fall of 1970, I had a nice slide rule (or “slipstick” as some of us called it) that I proudly carried in a leather case to my engineering and chemistry classes....
Davis Balestracci's picture
Davis Balestracci
Many talk about reducing variation to improve quality. Does that include human variation, where everyone takes a different approach to improving overall improvement processes? What would...
Quality Transformation With David Schwinn's picture
Quality Transformation With David Schwinn
This month’s column comes from a convergence of finishing my article, “Statistical Thinking for OD Professionals,” for the OD Practitioner, and reading “How Statistics Lost their Power—and Why We...
Donald J. Wheeler's picture
Donald J. Wheeler
A recent question from a statistician in Germany led me to the realization that the F-test of analysis of variance (ANOVA) fame is in serious need of an update. What the F-ratio does The F-...
Patrick Runkel's picture
Patrick Runkel
Did you ever wonder why statistical analyses and concepts often have such weird, cryptic names? One conspiracy theory points to the workings of a secret committee called the ICSSNN. The...
Davis Balestracci's picture
Davis Balestracci
According to Mark Graham Brown, from his book Keeping Score (Productivity Press, 2006), 50 percent of the time leaders spend in meetings involving data is waste, 80 percent of the pounds of...
Donald J. Wheeler's picture
Donald J. Wheeler
The average and range chart handles most situations where the data can be logically organized into homogeneous subgroups. However, this chart breaks down when faced with a hierarchical data...
Bruno Scibilia's picture
Bruno Scibilia
Genichi Taguchi is famous for his pioneering methods of robust quality engineering. One of the major contributions that he made to quality improvement methods is Taguchi designs. Designed...
Davis Balestracci's picture
Davis Balestracci
Just curious: Do you have monthly (and/or quarterly and/or even weekly) “How’re we doin’?” meetings like the end-of-year scenario described in my November and December columns last year—about...
Eston Martz's picture
Eston Martz
The language of statistics is a funny thing, but there usually isn’t much to laugh at in the consequences that can follow when misunderstandings occur between statisticians and nonstatisticians. We...
Catherine Beare's picture
Catherine Beare
Sponsored Content Although efforts have been made to create policies that support a bias-free workplace, there is still a considerable way to go toward achieving the gender equality that...
Donald J. Wheeler's picture
Donald J. Wheeler
Good measurements are like apple pie and motherhood. Who could ever be against having good measurements? Since we all want good measurements, it sounds reasonable when people are told to check out...
Quality Transformation With David Schwinn's picture
Quality Transformation With David Schwinn
I recently presented “Statistical Thinking for OD Professionals” for the Organization Development Network annual conference. It was well received, but more important, it reignited in me a passion...
Davis Balestracci's picture
Davis Balestracci
In spite of the overwhelming odds against me, every new year I firmly resolve to reignite my relentless passion about creating a critical mass of colleagues committed to practicing...
Eston Martz's picture
Eston Martz
A member of Minitab’s LinkedIn group asked how to create a chart to monitor change by month, specifically comparing last year’s data to this year’s data. My last post showed how to do...
Donald J. Wheeler's picture
Donald J. Wheeler
What can be done when a test is destructive? How do we characterize measurement error? How can we determine if a test method is adequate for a given product or application? How can we check for...
Greg Fox's picture
Greg Fox
It’s that time of year again. The time when eggs get nogged, pudding gets figgy, and it becomes socially acceptable to speak in rhyme. So on that note, and with apologies to Clement Clarke...