How far are you from North Korea?

August 14, 2017
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With North Korea's growing missile capabilities in the news lately, I thought it would be interesting to create a map showing how far (or close) they are from other parts of the world. I first did a few searches on the Web, to see what maps are already...
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What is rank correlation?

August 14, 2017
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When someone refers to the correlation between two variables, they are probably referring to the Pearson correlation, which is the standard statistic that is taught in elementary statistics courses. Elementary courses do not usually mention that there are other measures of correlation. Why would anyone want a different estimate of

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So, 27 US states are farther north than Canada, eh?

August 10, 2017
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With all the recent talk about some people wanting to move from the US to Canada, I got to wondering how cold, and how far north Canada is. And after a few Google searches, I was surprised to learn that 27 US states are actually farther north than the southernmost point

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3 steps to prepare your data for accurate predictive models in SAS Enterprise Miner

August 10, 2017
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In this post I describe the important tasks of data preparation, exploration and binning.These three steps enable you to know your data well and build accurate predictive models. First you need to clean your data. Cleaning includes eliminating variable...
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Robust principal component analysis in SAS

August 9, 2017
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Recently, I was asked whether SAS can perform a principal component analysis (PCA) that is robust to the presence of outliers in the data. A PCA requires a data matrix, an estimate for the center of the data, and an estimate for the variance/covariance of the variables. Classically, these estimates

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The curse of non-unique eigenvectors

August 7, 2017
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A SAS customer asked, "I computed the eigenvectors of a matrix in SAS and in another software package. I got different answers? How do I know which answer is correct?" I've been asked variations of this question dozens of times. The answer is usually "both answers are correct." The mathematical

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Viewing SAS catalogs and formats in SAS Enterprise Guide

August 4, 2017
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Many years ago I shared a custom task that allows you to view and manage SAS catalogs within SAS Enterprise Guide. As a reminder, a SAS catalog is a special type of SAS file that acts as a container, like a folder, for a variety of content items called catalog

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Sunsquatch – tracking the eclipse and Bigfoot … at the same time!

August 4, 2017
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In the spirit of my Forecasting Sharknadoes blog post, I now bring you Sunsquatch! In this blog post, I create a map that helps you find a location where you can see the total eclipse *and* have a chance of seeing Bigfoot (aka, Sasquatch)! But before we get into the nitty-gritty

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You can write a script for that …

August 3, 2017
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When I first started teaching JMP classes for SAS Education 10 years ago, I sat in to observe a colleague teaching our introductory JMP data exploration course. The students had lots of questions about using JMP for their own projects, and were excited to learn about all the capabilities of

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