Spotting a misleading chart

March 25, 2015
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Everyone loves a good conspiracy theory - hopefully you'll enjoy mine about the number of US E1 visas! I was perusing some of the US government charts, and found one on US immigration visas that caught my attention. It was a 3D bar chart, and since I always mistrust 3D

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On the number of permutations supported in SAS software

March 25, 2015
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On the number of permutations supported in SAS software

There's "big," and then there is "factorial big." If you have k items, the number of permutations is "k factorial," which is written as k!. The factorial function gets big fast. For example, the value of k! for several values of k is shown in the following table. You can

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When art and analytics collide

March 24, 2015
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The best graphs are both beautiful and informative - a smooth blend of art and analytics. But more often than not, the two collide rather than blending smoothly... Here is a link to a artistic infographic I recently saw posted by Vendavo on twitter. Their message (80% of your profit is generated

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Vectors that have a fractional number of elements

March 23, 2015
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Vectors that have a fractional number of elements

The title of this article makes no sense. How can the number of elements (in fact, the number of anything!) not be a whole number? In fact, it can't. However, the title refers to the fact that you might compute a quantity that ought to be an integer, but is

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Deploy a minimal Spark cluster

March 20, 2015
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Requirements

Since Spark is rapidly evolving, I need to deploy and maintain a minimal Spark cluster for the purpose of testing and prototyping. A public cloud is the best fit for my current demand.
  1. Intranet speed
    The cluster should easily copy the data from one server to another. MapReduce always shuffles a large chunk of data...
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Euro vs Dollar exchange rate: An historic event?

March 20, 2015
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I recently read a Washington Post article about the euro versus the dollar, and I wanted to analyze the data myself to see whether the article was simply stating the facts, or "sensationalizing" things. The washingtonpost.com article started with the headline, "This is historic: The dollar will soon be worth

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It’s Analytics Survey Time!

March 20, 2015
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Every other year Rexer Analytics surveys Data Analysts, Predictive Modelers, Data Scientists, Data Miners, and all other types of analytic professionals, students, and academics regarding the software they use.  I then update the main results in The Popularity of Data Analysis … Continue reading
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What’s your opinion on daylight saving time?

March 19, 2015
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Is daylight saving time the ultimate in efficiency, or is it living a lie? Here are some graphs that might help facilitate a discussion on this topic ... With daylight saving time (DST), a whole geo/political area (such as a country) decides to set their clocks forward an hour during

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Data Super Savers vs Data Science

March 18, 2015
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“Dear Cat, I got an email from my IT department that says: Doesn’t this strike you as a bit old-fashioned? I

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