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Tips and Techniques for Statistics and Quality Improvement

Blog posts and articles about using Minitab software in quality improvement projects, research, and more.

  Time series plots help us see variations over time by displaying observations on the y-axis against equally spaced time intervals on the x-axis. In Lean Six Sigma, they can show you the before-and-after effects of a process change. I recently used a time series plot to see how the price of gold has changed over time. After reaching record highs recently, gold prices have dipped, although some... Continue Reading
It’s summer and maybe you’re traveling to Florida’s coast for a beach vacation (or just wishing you were, like I am)! I got the chance to talk to Dr. Henry Briceño from the Southeast Environmental Research Center (SERC) about how he and his team use statistics to monitor Florida’s water quality. The center’s research projects throughout South Florida have provided a basis for management decisions... Continue Reading

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Ever feel frustrated with the flip-floppy results reported in the medical news? Today a cup of coffee will lead you to an early grave. Tomorrow it will ensure that you’ll be dancing a jig on your 99th birthday. Every day, it seems there’s a new study that contradicts a previous finding.   In response, some people throw up their hands in helplessness. Others shrug—then chug another double-shot of... Continue Reading
Statistics can be confusing, especially when you look under the hood at the mathematical engines that underlie it. That's why we use statistical software to do so much of the work for us, and why we use tools like p-values to help us make sense of what our data are saying.The p-value is used in basic statistics, linear models, reliability, multivariate analysis, and many other methods. It's a ... Continue Reading
When you're looking at the results of data analysis, it's always good to keep in mind what different analyses do and don't "prove." This is especially true when you're reading about health-related studies in the popular press.For whatever reason, the media frequently imply that a study has revealed some cause-and-effect relationship, even when the study's authors detail precisely the limitations... Continue Reading
Whether we're talking about sports or the best way to improve a process through Lean Six Sigma, it's good practice to verify things you "know" with some data. Quick and easy data analysis sometimes reveals that what everyone took as common knowledge just isn't true. On the other hand, looking at data also can confirm your suspicions.For example, it's no secret that LeBron James didn't play well... Continue Reading
I was 'lucky' enough to learn about how Betfair, one of the world's largest online sports betting communities, employs quality improvement in their day-to-day business. Here's a snippet of the case study: Betfair turned to Minitab when a crucial process for helping new customers get started needed improvement. The company invests heavily in different marketing activities, including an outbound... Continue Reading
We recently published a few new case studies featuring the Northern Sydney Central Coast Health Service (NSCCHS) and their commitment to quality improvement. The health service is based in Australia and extends from the Sydney Harbor to the northern reaches of the Central Coast, including a total of 11 different facilities. After the NSCCHS realized the success of a few isolated improvement... Continue Reading
I’m an avid shopper and coupon-clipper. I receive most of my coupons via e-mail and I often wonder what day of the week the best coupons will be e-mailed. In my attempt to live a Lean life, I think finding this out will save me time and prevent me from opening some of the hundreds of promotional e-mails I get each week. Before performing any data analysis in Minitab, I decided to assign the... Continue Reading
As I mentioned before, accurate instruments won’t yield good data if you haven’t answered three fundamental questions that should precede every measurement system analysis. Whether you're doing a 6 Sigma project, or data analysis in support of a research project or some other goal, you need to be careful about how, when and where you gather the data. Here’s how I learned that lesson the hard way.I... Continue Reading
Sometimes, statistical terms can seem like they were zapped down from outer space by sadistic, mealy-mouthed aliens: R-squared adjusted, heteroeskadasticity, 3-parameter Weibull distribution. But not all statistics terminology should leave you feeling woozy and glassy-eyed. Some terms  actually make intuitive sense. Knowing those terms can help you get a handle on output that may seem fuzzy at... Continue Reading
No, I’m not talking about meat that contains less fat or really healthy food! I’m talking about the Lean Six Sigma Manufacturing Techniques at work in your favorite fast-food restaurants. I attended an in-house Lean training a few months back taught by Paul Sheehy, one of Minitab’s technical training specialists. Paul explained Lean fundamentals through examples—including just some of the ways... Continue Reading
Let’s face it. You’re busy. I’m busy. We’re all busy with our business. In a world that spins at about 1,000 miles per hour, and seems to pick up speed every day , we’re lucky if we have enough time, energy, and focus to put on matching socks in the morning. (Notice that my socks have been cropped from this picture.) So trying to quickly get a handle on the statistics you need for a quality... Continue Reading
“Fear leads to anger, anger leads to hate, hate leads to suffering.” Yoda This quotation sums up the way most people’s relationship to statistics develops. But not me. My name is Cody Steele, and I’m the guy who Eston Martz warned you about. From the time my 6-year-old self decided that Superman’s most amazing power was his intelligence, through buying a calculus book after college so that I could... Continue Reading
A recent study by Bank of America found that the proportion of Americans under 50 on Facebook is 96%. However, the second paragraph of the article questions the validity of the study. It says: A total of 418 participants were included in the polling. Such a limited sample size will surely bolster calls that the survey was statistically unreliable, but the persons questioned were supposed to... Continue Reading
My name is Redouane Kouiden. Thanks for reading! The beauties and complexities of our world become even more puzzling when you start looking at the numbers behind. Whether it is forecasting the weather or predicting the next presidential election results, statistical sciences are becoming more and more reliable and applied across various fields of study and industries.  One particular aspect that... Continue Reading
Data collection involves taking measurements, and this seems like a simple thing when the subject is relatively simple.  However, even the simplest of cases has the potential to be messed up.  I found this out the hard way once. I hope sharing it helps you avoid a similar experience. Experienced researchers and quality practitioners know they need to verify that a measurement system provides valid... Continue Reading
When I was in middle school, I picked up the newspaper to read an article on the opponent our varsity football team was playing that night (for our younger audience, this is what a newspaper is). The article said the opposing team’s running back was averaging almost 6 yards per carry, which is very high. I decided that I wanted to keep stats during the game to see if he was able to average 6 yards... Continue Reading
"Gimme a latte grande with a double shot of statistical analysis. Hold the sugar."If I tried ordering that the next time I go to Starbucks, my barista would probably just give me a blank look. But the fact is that the world's best-known coffee company applies a great deal of statistical know-how to making sure customers get the best possible coffee, whether they're getting it at a Starbucks... Continue Reading
I was reading an article recently about Jackson Pollock, an abstract artist famous for his “drip paintings,” and I became intrigued when I found out his art falls under the category of “process art.” As I learned more about Pollock and his “process,” I started to think about what he could teach us about process improvement.The process Pollock took to make his artwork was very calculated, hence the... Continue Reading