Posts Tagged ‘ Uncategorized ’

How to choose colors for maps and heat maps

October 1, 2014
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How to choose colors for maps and heat maps

Have you ever looked as a statistical graph that uses bright garish colors and thought, "Why in the world did that guy choose those awful colors?" Don't be "that guy"! Your choice of colors for a graph can make a huge difference in how well your visualization is perceived by […]

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You think P-values are bad? I say show me the data.

September 30, 2014
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Both the scientific community and the popular press are freaking out about reproducibility right now. I think they have good reason to, because even the US Congress is now investigating the transparency of science. It has been driven by the … Continue reading →

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Create discrete heat maps in SAS/IML

September 29, 2014
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Create discrete heat maps in SAS/IML

In a previous article I introduced the HEATMAPCONT subroutine in SAS/IML 13.1, which makes it easy to visualize matrices by using heat maps with continuous color ramps. This article introduces a companion subroutine. The HEATMAPDISC subroutine, which also requires SAS/IML 13.1, is designed to visualize matrices that have a small […]

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Canned Regular Expressions: qdapRegex 0.1.2 on CRAN

September 27, 2014
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Canned Regular Expressions: qdapRegex 0.1.2 on CRAN

We’re pleased to announce first CRAN release of qdapRegex! You can read about qdapRegex or skip right to the examples. qdapRegex is a collection of regular expression tools associated with the qdap package that may be useful outside of the context … Continue reading →

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The frequency of bigrams in an English corpus

September 26, 2014
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The frequency of bigrams in an English corpus

In last week's article about the distribution of letters in an English corpus, I presented research results by Peter Norvig who used Google's digitized library and tabulated the frequency of each letter. Norvig also tabulated the frequency of bigrams, which are pairs of letters that appear consecutively within a word. […]

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Designing a quantile bin plot

September 24, 2014
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Designing a quantile bin plot

While at JSM 2014 in Boston, a statistician asked me whether it was possible to create a "customized bin plot" in SAS. When I asked for more information, she told me that she has a large data set. She wants to visualize the data, but a scatter plot is not […]

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Unbundling the educational package

September 22, 2014
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I just got back from the World Economic Forum's summer meeting in Tianjin, China and there was much talk of disruption and innovation there. Basically, if you weren't disrupting, you were furniture. Perhaps not surprisingly, one topic area that was … Continue reading →

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Skew this

September 22, 2014
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Skew this

The skewness of a distribution indicates whether a distribution is symmetric or not. A distribution that is symmetric about its mean has zero skewness. In contrast, if the right tail of a unimodal distribution has more mass than the left tail, then the distribution is said to be "right skewed" […]

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FPP now available as a downloadable e-book

September 21, 2014
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FPP now available as a downloadable e-book

My forecasting textbook with George Athanasopoulos is already available online (for free), and in print via Amazon (for under $40). Now we have made it available as a downloadable e-book via Google Books (for $15.55). The Google Books version is identical to the print version on Amazon (apart from a few typos that have been fixed). To use […]

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The frequency of letters in an English corpus

September 19, 2014
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The frequency of letters in an English corpus

It's time for another blog post about ciphers. As I indicated in my previous blog post about substitution ciphers, the classical substitution cipher is no longer used to encrypt ultra-secret messages because the enciphered text is prone to a type of statistical attack known as frequency analysis. At the root […]

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