The arithmetic-geometric mean

August 23, 2017
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The arithmetic-geometric mean

All statisticians are familiar with the classical arithmetic mean. Some statisticians are also familiar with the geometric mean. Whereas the arithmetic mean of n numbers is the sum divided by n, the geometric mean of n nonnegative numbers is the n_th root of the product of the numbers. The geometric

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Can you see these spots (after viewing the eclipse)?

August 21, 2017
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Hopefully if you're viewing the eclipse today, you'll be using one of the safe methods that won't harm your eyes! ... But if you're somewhat of a trickster, here's an optical illusion you can send your friends after the eclipse, that might make them...
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6 tips for timing the performance of algorithms

August 21, 2017
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6 tips for timing the performance of algorithms

When you implement a statistical algorithm in a vector-matrix language such as SAS/IML, R, or MATLAB, you should measure the performance of your implementation, which means that you should time how long a program takes to analyze data of varying sizes and characteristics. There...
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Code debugging and program history in SAS Enterprise Guide

August 18, 2017
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Code debugging and program history in SAS Enterprise Guide

SAS programmers have high expectations for their coding environment, and why shouldn't they? Companies have a huge investment in their SAS code base, and it's important to have tools that help you understand that code and track changes over time. Few things are more...
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Mapping out the next robot invasion!

August 17, 2017
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Robots - everyone has probably been fascinated by the idea of robots at one time or another. From the early science fiction robots (such as Klaatu's robot Gort) to the mid-1980s movie robots (like Johnny 5), they have been portrayed in many different w...
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Which of my factors are important?

August 16, 2017
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This question has been asked repeatedly for decades by anyone facing a new system. That system might be a new product, a new piece of equipment, a new process, or anything really that is new and not well understood. Ultimately, you might need to...
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Jedi SAS Tips – Favorite Resources for SAS Programmers

August 16, 2017
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I frequently get asked about my favorite book on a particular topic, how to find free SAS learning materials online, how to get help with SAS issues, etc. This lead me to compile a "Great Resources for SAS Programmers" document which I freely share...
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Use a bar chart to visualize pairwise correlations

August 16, 2017
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Use a bar chart to visualize pairwise correlations

Visualizing the correlations between variables often provides insight into the relationships between variables. I've previously written about how to use a heat map to visualize a correlation matrix in SAS/IML, and Chris Hemedinger showed how to use Base SAS to visualize correlations between variables....
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Java Look & Feel with SAS Management Console on Linux

August 16, 2017
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As someone who specialises in SAS® metadata security, I spend a lot of time using the Authorization tab in SAS Management Console. I also use Linux a great deal. When I run SAS Management Console on Linux, I’ve noticed that the check box background...
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