Statistics Features

Eston Martz's picture
Eston Martz
A recent post at Ben Orlin’s always amusing mathwithbaddrawings.com blog nicely encapsulates why so many people feel wary about anything related to statistics and data analysis. Take a moment...
Donald J. Wheeler's picture
Donald J. Wheeler
The question “Is this batch like the others?” is asked all over the world on a daily basis. It turns out that the process behavior chart provides a very effective answer for questions about the...
Scott A. Hindle's picture
Scott A. Hindle
A t the end of part three of this four-part series on process capability, Alan was ready to identify a contact at the factory who could assist in providing some context around the...
Scott A. Hindle's picture
Scott A. Hindle
Part two of this four-part series on process capability concluded with Alan just about to meet Sarah for a second time. He thought he was making good progress with his analysis of Product 874 data...
Scott A. Hindle's picture
Scott A. Hindle
In part one of this four-part series, we considered the basics of process capability, as witnessed through the learning curve of Alan in his quest to determine the product characteristics of the...
Scott A. Hindle's picture
Scott A. Hindle
In my August 2015 article, “Process Capability: How Many Data?” I discussed whether 30 data were the “right” number in an analysis of process capability. In this four-part series, the focus is on...
Davis Balestracci's picture
Davis Balestracci
I hope this little diversion into design of experiments (DOE) that I’ve explored in my last few columns has helped clarify some things that may have been confusing. Even if you don’t use DOE, there...
Meredith Griffith's picture
Meredith Griffith
When I wrote about automation back in March, I made my husband out to be an automation guru. He certainly is, but what you don’t know about my husband is that, although he loves to automate...
Fred Schenkelberg's picture
Fred Schenkelberg
Spending too much on reliability and not getting the results you expect? Just getting started and not sure where to focus your reliability program? Or, just looking for ways to improve your program...
Donald J. Wheeler's picture
Donald J. Wheeler
Having described the report card chart and the process monitor chart in previous columns, we now turn to a third way that people use process behavior charts—the process trial chart. Here the...
Patrick Runkel's picture
Patrick Runkel
It’s been called a “demographic watershed.” During the next 15 years alone, the worldwide population of individuals aged 65 and older is projected to increase more than 60 percent, from...
Donald J. Wheeler's picture
Donald J. Wheeler
The simple process behavior chart may be used in several ways. Many articles and some textbooks describe process behavior charts as tools for process monitoring. In Norway the words used for SPC...
Gillian Groom's picture
Gillian Groom
You often hear the data being blamed when an analysis does not deliver the expected answers. I was recently reminded that the data chosen or collected for a specific analysis is determined by the...
Bruno Scibilia's picture
Bruno Scibilia
Businesses are getting more and more data from existing and potential customers. Whenever we click on a website, for example, it can be recorded in the vendor’s database, and whenever we use...
Barbara A. Cleary's picture
Barbara A. Cleary
Approaching the end of the school year means focusing on graduation rates, dropout rates, and other data suggesting trends for students. Opportunities for considering statistics abound, but one...
Ken Levine's picture
Ken Levine
How do you determine the “worst case” scenario for a process? Is it by assuming the worst case for each process task or step? No. The reason is that the probability of every step having its worst...
Ken Voytek's picture
Ken Voytek
In a recent post, I examined the differences in productivity across small and large manufacturing firms, and noted that there were differences across manufacturers in terms of size. But it’s also...
Greg Fox's picture
Greg Fox
Remember the classic science fiction film The Matrix? The dark sunglasses, the leather, computer monitors constantly raining streams of integers (inexplicably in base 10 rather than binary or...
Patrick Runkel's picture
Patrick Runkel
What does the eyesight of a homeless person have in common with complications from dental anesthesia? Or with reducing side-effects from cancer? Or monitoring artificial hip implants? These are all...
Davis Balestracci's picture
Davis Balestracci
In my last column I explained how many situations have an inherent response surface, which is the “truth.” However, any experimental result represents this true response, which is unfortunately...