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Snowy Statistics: 2018 Winter Weather and Analyzing Boston's Record 2015...
As we start off 2018, our eyes are on the winter weather, specifically low temperatures and snowfall. After 2015-2016's warmest winter on record and Chicago breaking records in 2017 with no snow...
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Fighting Wildfires with Statistical Analysis
Wildfires in California have killed at least 40 people and burned more than 217,000 acres in the past few weeks. Nearly 8,000 firefighters are trying to contain the blazes with the aid of more than 800...
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How to Avoid Overfitting Your Regression Model
Overfitting a model is a real problem you need to beware of when performing regression analysis. An overfit model result in misleading regression coefficients, p-values, and R-squared statistics....
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What's the Difference between Confidence, Prediction, and Tolerance Intervals?
In statistics, as in life, absolute certainty is rare. That's why statisticians often can't provide a result that is as specific as we might like; instead, they provide the results of an analysis as a...
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Flight of the Chickens: A Statistical Bedtime Story, Part 2
by Matthew Barsalou, guest bloggerAt the end of the first part of this story, a group of evil trouble-making chickens had convinced all of their fellow chickens to march on the walled city of Wetzlar,...
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Flight of the Chickens: A Statistical Bedtime Story, Part 1
by Matthew Barsalou, guest bloggerOnce upon a time, in the Kingdom of Wetzlar, there was a farm with over a thousand chickens, two pigs, and a cow. The chickens were well treated, but a few...
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3 Keys to Getting Reliable Data
Can you trust your data? That's the very first question we need to ask when we perform a statistical analysis. If the data's no good, it doesn't matter what statistical methods we employ, nor how much...
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Sunny Day for A Statistician and A Householder – An Update
We had solar panels fitted on our property in 2011. Last year, we had a few problems with the equipment. It was shutting down at various times throughout the day, typically when it was very sunny,...
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Area Graphs: An Underutilized Tool
In my time at Minitab, I’ve gotten a good understanding of what types of graphs users create. Everyone knows about histograms, bar charts, and time series plots. Even relatively less familiar plots...
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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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What Does It Mean When Your Probability Plot Has Clusters?
Have you ever had a probability plot that looks like this?The probability plot above is based on patient weight (in pounds) after surgery minus patient weight (again, in pounds) before surgery.The red...
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Cp and Cpk: Two Process Perspectives, One Process Reality
It’s usually not a good idea to rely solely on a single statistic to draw conclusions about your process. Do that, and you could fall into the clutches of the “duck-rabbit” illusion shown here:If you...
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Gleaning Insights from Election Data with Basic Statistical Tools
One of the biggest pieces of international news last year was the so-called "Brexit" referendum, in which a majority of voters in the United Kingdom cast their ballots to leave the European Union...
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Attribute Acceptance Sampling for an Acceptance Number of 0
Suppose that you plan to source a substantial amount of parts or subcomponents from a new supplier. To ensure that their quality level is acceptable to you, you might want to assess the capability...
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A Swiss Army Knife for Analyzing Data
Easy access to the right tools makes any task easier. That simple idea has made the Swiss Army knife essential for adventurers: just one item in your pocket gives you instant access to dozens of tools...
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See the New Features and Enhancements in Minitab 18 Statistical Software
It's a very exciting time at Minitab's offices around the world because we've just announced the availability of Minitab® 18 Statistical Software.Data is everywhere today, but to use it to make sound,...
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Fundamentals of Gage R&R
Before cutting an expensive piece of granite for a countertop, a good carpenter will first confirm he has measured correctly. Acting on faulty measurements could be costly.While no measurement system...
View ArticleThe Null Hypothesis: Always “Busy Doing Nothing”
The 1949 film A Connecticut Yankee in King Arthur's Court includes the song “Busy Doing Nothing,” and this could be written about the Null Hypothesis as it is used in statistical analyses. The words to...
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Monitoring Rare Events with G Charts
Rare events inherently occur in all kinds of processes. In hospitals, there are medication errors, infections, patient falls, ventilator-associated pneumonias, and other rare, adverse events that cause...
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Methods and Formulas: How Are I-MR Chart Control Limits Calculated?
Users often contact Minitab technical support to ask how the software calculates the control limits on control charts.A frequently asked question is how the control limits are calculated on an I-MR...
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