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How to Calculate BX Life, Part 2b: Handling Triangular Matrix Data
I thought 3 posts would capture all the thoughts I had about B10 Life. That is, until this question appeared on the Minitab LinkedIn group:In case you missed it, my first post, How to Calculate B10...
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To Infinity and Beyond with the Geometric Distribution
See if this sounds fair to you. I flip a coin.Heads: You win $1.Tails: You pay me $1.You may not like games of chance, but you have to admit it seems like a fair game. At least, assuming the coin is a...
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Data Not Normal? Try Letting It Be, with a Nonparametric Hypothesis Test
So the data you nurtured, that you worked so hard to format and make useful, failed the normality test.Time to face the truth: despite your best efforts, that data set is never going to measure up to...
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What the Heck Are Sums of Squares in Regression?
In regression, "sums of squares" are used to represent variation. In this post, we’ll use some sample data to walk through these calculations.The sample data used in this post is available within...
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Sunny Day for A Statistician vs. Dark Day for A Householder with Solar Panels
In 2011 we had solar panels fitted on our property. In the last few months we have noticed a few problems with the inverter (the equipment that converts the electricity generated by the panels from DC...
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How to Pick the Right Statistical Software
If you’re in the market for statistical software, there are many considerations and more than a few options for you to evaluate.Check out these seven questions to ask yourself before choosing...
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Online Dating: Is She in the Driver's Seat? A Test of 2 Proportions
The other day I was having lunch with my friend, Bob. Bob was sharing some observations from his recent foray into the world of online dating. "For some reason," Bob mused, "lots of women post pictures...
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Is Alabama Going Undefeated this Year? Creating Simulations in Minitab
The college football season is here, and this raises a very important question:Is Alabama going to be undefeated when they win the national championship, or will they lose a regular-season game along...
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Creating Value from Your Data
There may be huge potential benefits waiting in the data in your servers. These data may be used for many different purposes. Better data allows better decisions, of course. Banks, insurance firms, and...
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How to Identify the Most Important Predictor Variables in Regression Models
You’ve performed multiple linear regression and have settled on a model which contains several predictor variables that are statistically significant. At this point, it’s common to ask, “Which variable...
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Control Charts and Capability Analysis: How to Setup Your Data
To assess if a process is stable and in statistical control, you can use a control chart. It lets you answer the question "is the process that you see today going to be similar to the process that you...
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Control Chart Tutorials and Examples
The other day I was talking with a friend about control charts, and I wanted to share an example one of my colleagues wrote on the Minitab Blog. Looking back through the index for "control charts"...
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When to Use a Pareto Chart
I confess: I'm not a natural-born decision-maker. Some people—my wife, for example—can assess even very complex situations, consider the options, and confidently choose a way forward. Me? I get anxious...
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Whatever Happened to…the Ozone Hole?
Today, September 16, is World Ozone Day. You don't hear much about the ozone layer any more.In fact, if you’re under 30, you might think this is just another trivial, obscure observance, along the...
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Problems Using Data Mining to Build Regression Models
Data mining uses algorithms to explore correlations in data sets. An automated procedure sorts through large numbers of variables and includes them in the model based on statistical significance alone....
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Descriptive vs. Inferential Statistics: When Is a P-value Superfluous?
True or false: When comparing a parameter for two sets of measurements, you should always use a hypothesis test to determine whether the difference is statistically significant.The answer?...
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Validating Process Changes with Design of Experiments (DOE)
We’ve got a plethora of case studies showing how businesses from different industries solve problems and implement solutions with data analysis. Take a look for ideas about how you can use data...
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How to Save a Failing Regression with PLS
Face it, you love regression analysis as much as I do. Regression is one of the most satisfying analyses in Minitab: get some predictors that should have a relationship to a response, go through a...
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5 Powerful Insights from Noted Quality Leaders
If you were among the 300 people who attended the first-ever Minitab Insights conference in September, you already know how powerful it was. Attendees learned how practitioners from a wide range of...
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Why Shrewd Experts "Fail to Reject the Null" Every Time
I watched an old motorcycle flick from the 1960s the other night, and I was struck by the bikers' slang. They had a language all their own. Just like statisticians, whose manner of speaking often...
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