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3 Ways to Identify the Most Common Categories in a Column
You have a column of categorical data. Maybe it’s a column of reasons for production downtime, or customer survey responses, or all of the reasons airlines give for those riling flight delays. Whatever...
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Weight for It! A Healthy Application of the Central Limit Theorem
Like so many of us, I try to stay healthy by watching my weight. I thought it might be interesting to apply some statistical thinking to the idea of maintaining a healthy weight, and the central limit...
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A Surgeon's View of Data-Driven Quality Improvement
There has been plenty of noisy disagreement about the state of health care in the past several years, but when you get beyond the controversies surrounding various programs and changes, a great deal of...
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Do Those Who Work Less, Work Best?
I live with a German national, who often tells me that we Americans spend way too much of our lives at work. He also frequently comments that we work much less efficiently than Germans do, during the...
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Tests of 2 Standard Deviations? Side Effects May Include Paradoxical...
Once upon a time, when people wanted to compare the standard deviations of two samples, they had two handy tests available, the F-test and Levene's test.Statistical lore has it that the F-test is...
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The American Statistical Association's Statement on the Use of P Values
P values have been around for nearly a century and they’ve been the subject of criticism since their origins. In recent years, the debate over P values has risen to a fever pitch. In particular, there...
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Minitab 17.3 Takes a Quantum Leap with Data Import
If you watched television between 1989 and 1993, then you might have had the chance to see original episodes of the television series Quantum Leap.The premise was that a scientist involved in a...
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Are You Putting the Data Cart Before the Horse? Best Practices for Prepping...
Most of us have heard a backwards way of completing a task, or doing something in the conventionally wrong order, described as “putting the cart before the horse.” That’s because a horse pulling a cart...
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Best Way to Analyze Likert Item Data: Two Sample T-Test versus Mann-Whitney
Five-point Likert scales are commonly associated with surveys and are used in a wide variety of settings. You’ve run into the Likert scale if you’ve ever been asked whether you strongly agree, agree,...
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What Are Degrees of Freedom in Statistics?
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 of wild beast that...
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3 Ways to Examine Data Over Time
Did you know that Minitab provides several tools you can use to view patterns in data over time? If you want to examine, say, monthly sales for your company, or even how the number of patients admitted...
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Better Home$ and Baseboards: Using Data Distributions to Set a List Price
People say that I overthink everything. I've given this assertion considerable thought, and I don't believe that it is true. After all, how can any one person possibly overthink every possible thing in...
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Manipulating Your Survey Data in Minitab
As a recent graduate from Arizona State University with a degree in Business Statistics, I had the opportunity to work with students from different areas of study and help analyze data from various...
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Beware the Radar Chart!
Along with the explosion of interest in visualizing data over the past few years has been an excessive focus on how attractive the graph is at the expense of how useful it is. Don't get me wrong...I...
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3 Ways to Graph 3 Variables in Minitab
You can use contour plots, 3D scatterplots, and 3D surface plots in Minitab to view three variables in a single plot. These graphs are ideal if you want to see how temperature and humidity affect the...
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An Overview of Discriminant Analysis
Among the most underutilized statistical tools in Minitab, and I think in general, are multivariate tools. Minitab offers a number of different multivariate tools, including principal component...
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Regression versus ANOVA: Which Tool to Use When
Suppose you’ve collected data on cycle time, revenue, the dimension of a manufactured part, or some other metric that’s important to you, and you want to see what other variables may be related to it....
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Poisson Data: Examining the Number Deaths in an Episode of Game of Thrones
There may not be a situation more perilous than being a character on Game of Thrones. Warden of the North, Hand of the King, and apparent protagonist of the entire series? Off with your head before the...
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Fitting an ARIMA Model
Time series data is proving to be very useful these days in a number of different industries. However, fitting a specific model is not always a straightforward process. It requires a good look at the...
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The Matrix, It's a Complex Plot
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...
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