Statistics Features

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...
Donald J. Wheeler's picture
Donald J. Wheeler
The simple process behavior chart can be used in many different ways. Since report card data are common in all types of businesses, the report card chart is often the first chart that people create...
Patrick Runkel's picture
Patrick Runkel
The Pareto chart is a graphic representation of the 80/20 rule, also known as the Pareto principle. If you’re a quality improvement specialist, you know that the chart is named after the early 20th...
Davis Balestracci's picture
Davis Balestracci
I’ve mentioned that design of experiments (DOE) is one of the few things worth salvaging from typical statistical training, and I thought I’d talk a bit more about DOE in the next couple of columns...
Brooke Pierce's picture
Brooke Pierce
The healthcare industry is in a state of constant change, and with change comes opportunity. With the passage of the Affordable Care Act (ACA) and the Medicare Access and CHIP Reauthorization Act (...
Donald J. Wheeler's picture
Donald J. Wheeler
Experimental designs that result in orthogonal data structures allow us to get the most out of both our analysis and our research budget. As a result, designed experiments have been used for...
Donald S. Holmes's picture
Donald S. Holmes
Regression analysis is used in a variety of manufacturing applications. An example of such an application would be to learn the effect of process variables on output quality variables. This allows...
Fred Schenkelberg's picture
Fred Schenkelberg
What if all failures occurred truly randomly? Well, for one thing the math would be easier. The exponential distribution would be the only time to failure distribution—we wouldn’t need Weibull or...
Greg Fox's picture
Greg Fox
People say that I overthink everything. I’ve given this assertion considerable thought, and I don’t believe that it’s true. After all, how can any one person possibly overthink every possible thing...
Beth Savage's picture
Beth Savage
The 2016 Masters Tournament is in the history books. Jordan Spieth had what some are calling an epic meltdown on the final nine holes of the tournament, and in a come-from-behind victory, Danny...
Bruno Scibilia's picture
Bruno Scibilia
In yesterday’s column, I discussed how a DOE was chosen to optimize a chemical-mechanical polishing process in the microelectronics industry. This important process improved the plant’s final...
Patrick Runkel's picture
Patrick Runkel
About a year ago, a reader asked if I could try to explain degrees of freedom in statistics. Since then, I’ve been circling around that request very cautiously, like it’s some kind...