Statistics Features

Scott A. Hindle's picture
Scott A. Hindle
‘Process Capability: What It Is and How It Helps,” parts one, two, three, and four, discussed Alan’s development in the field of process capability1 He’d learned about the mistakes that can be made...
Donald J. Wheeler's picture
Donald J. Wheeler
With the click of your mouse you can turn a list of values into a bubble plot. No thought or effort is required. Simply sit back and let the software gods do the heavy lifting of transforming...
Tom Siegfried's picture
Tom Siegfried
If Fyodor Dostoyevsky had been a mathematician, he might have written a book called Crime and Statistics. However, since “statistics” doesn’t have quite the same ring as “punishment,” it wouldn’t...
Davis Balestracci's picture
Davis Balestracci
“People think that if you collect enormous amounts of data you are bound to get the right answer. You are not bound to get the right answer unless you are enormously smart.” —Bradley Efron There has...
Donald J. Wheeler's picture
Donald J. Wheeler
Story update 1/15/2019: Thanks to the sharp eye of Dr. Stan Alekman, who spotted an inconsistent value in figure 2, I discovered an error in the program used to construct the table of critical...
Anthony D. Burns's picture
Anthony D. Burns
The control chart is at the heart of the very definition of quality. It is central to building, maintaining, and predicting quality into the future. However, control charts today, more often than not...
David Currie's picture
David Currie
This is part three of a three-part series. Read about good metrics in part one and bad metrics in part two. Have you ever had occasion to dread a metric reviewed month after month, where the metric...
Quality Digest's picture
Quality Digest
Annalise Suzuki, director of technology and engagement at software provider Elysium Inc., spoke to Quality Digest about the importance of model-based definitions (MBD) for data quality, validation,...
Anthony Chirico's picture
Anthony Chirico
Everybody wants to design and conduct a great experiment! To find enlightenment by the discovery of the big red X and perhaps a few smaller pink x’s along the way. Thoughtful selection of the best...
Jody Muelaner's picture
Jody Muelaner
In this article I will show that the conventional method for calculating uncertainty is not always reliable. In fact, it is generally only exact when the measurement can be represented by a simple...
Scott A. Hindle's picture
Scott A. Hindle
Walter Shewhart, father of statistical process control and creator of the control chart, put a premium on the time order sequence of data. Since many statistics and graphs are unaffected by this, you...
Minitab Inc.'s picture
Minitab Inc.
Machine learning as a tool in your analytical toolkit can help accelerate the discovery of insights in data that can create a more efficient manufacturing process and drive innovation. Machine...
Donald J. Wheeler's picture
Donald J. Wheeler
Process behavior charts are the interface between your data and your brain. But you have to begin by making a choice about which type of chart to use. You can either plot the individual values...
Minitab Inc.'s picture
Minitab Inc.
Process validation is vital to the success of companies that manufacture pharmaceutical drugs, vaccines, test kits, and a variety of other biological products for people and animals. According to FDA...
David Currie's picture
David Currie
This is the second article in a three-part series to help readers distinguish good metrics from bad. In part one we discussed good metrics. Here, we will look at a bad metric and...
Donald J. Wheeler's picture
Donald J. Wheeler
In Part One and Part Two of this series we discovered some caveats of data snooping. In Part Three we discovered how listening to the voice of the process differs from the model-based approach...
Anthony Chirico's picture
Anthony Chirico
Perhaps the reader recognizes d2 as slang for “designated driver,” but quality professionals will recognize it as a control chart constant used to estimate short-term variation of a process. The...
Minitab Inc.'s picture
Minitab Inc.
Choosing the correct linear regression model can be difficult. Trying to model it with only a sample doesn’t make it any easier. Let’s review some common statistical methods for selecting models,...
Dirk Dusharme @ Quality Digest's picture
Dirk Dusharme @ Quality Digest
In this episode we look at a history of quality, how you serve your customer in the housing industry, and what makes a good review. “Young couples ‘trapped in car dependency’” Building entry-level...
David Currie's picture
David Currie
Metrics are an important part of an effective quality management system (QMS). They are necessary to understand, validate, and course-correct the QMS. They should be used to verify that it is...