Where to SCUBA dive in North Carolina

May 26, 2017
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North Carolina is a very diverse state - especially when it comes to outdoor recreation opportunities. This weekend you could go hiking or kayaking in the mountains, watch a hot air balloon festival near Raleigh, and go wind surfing or fishing at the c...
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Take that SAS option

May 25, 2017
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Elizabeth is courageous. Scoliosis since birth, corrective spinal surgery replaced her spine with steel, tripping on stairs permanently broke her right ankle. Then she decided to come take yoga with me. To help ease back pain & reduce hip stress, I offered options like...
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Sample quantiles: A comparison of 9 definitions

May 24, 2017
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Sample quantiles: A comparison of 9 definitions

According to Hyndman and Fan ("Sample Quantiles in Statistical Packages," TAS, 1996), there are nine definitions of sample quantiles that commonly appear in statistical software packages. Hyndman and Fan identify three definitions that are based on rounding and six methods that are based on...
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Foreigners in Germany – let’s map it!

May 23, 2017
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These days, more and more people move to where the work is. And for many people in Europe, that 'where' is Germany. I recently saw an map of Germany, that showed which country had the most foreigners living in each area. It was an interesting...
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Quantile definitions in SAS

May 22, 2017
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Quantile definitions in SAS

In last week's article about the Flint water crisis, I computed the 90th percentile of a small data set. Although I didn't mention it, the value that I reported is different from the the 90th percentile that is reported in Significance magazine. That is...
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Using a peekaboo map to align your solar panels

May 19, 2017
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In recent years, solar panels have become much more economical, and therefore more popular. But because of the curvature of the Earth, the angle at which you need to install the panels varies, depending on where you live. In this example, I demonstrate...
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Several ways to look at US unemployment data

May 17, 2017
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The US unemployment rate was down to 4.4% in April, which is the lowest we've seen since before the big recession (about 10 years ago). But a single number seldom tells the whole story, so let's look at unemployment data in several different ways,...
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Quantiles and the Flint water crisis

May 17, 2017
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Quantiles and the Flint water crisis

The April 2017 issue of Significance magazine features a cover story by Robert Langkjaer-Bain about the Flint (Michigan) water crisis. For those who don't know, the Flint water crisis started in 2014 when the impoverished city began using the Flint River as a source...
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Dueling Data Science Surveys: KDnuggets & Rexer Go Live

May 16, 2017
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What tools do we use most for data science, machine learning, or analytics? Python, R, SAS, KNIME, RapidMiner,…? How do we use them? We are about to find out as the two most popular surveys on data science tools have … Continue reading...
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