Monthly Archives: December 2012

The Eye of the World as word cloud

December 16, 2012
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The Eye of the World as word cloud

The Eye of the World is the first book of Robert Jordan's Wheel of Time books. As the last of these books will be published soon, I was wondering if natural language processing can be used to examine books like these. For this purpose I downloaded a co...

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Matrix Algebra Useful for Statistics

December 16, 2012
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Matrix Algebra Useful for Statistics

I was having a conversation with an acquaintance about courses that were particularly useful in our work. My forestry degree involved completing 50 compulsory + 10 elective† courses; if I had to choose courses that were influential and/or really useful they would be Operations Research, Economic Evaluation of Projects, Ecology, 3 Calculus and 2 Algebras.

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Possibly slightly better text analysis with lme4

December 16, 2012
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Possibly slightly better text analysis with lme4

lme4 and its cousin arm are extremely useful for a huge variety of modeling applications (see Gelman and Hill’s book), but today we’re going to do something a little frivolous with them. Namely, we’re going to extend our Denver Debat...

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The R journal – Volume 4/2, December 2012

December 16, 2012
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Download complete issue Refereed articles may be downloaded individually using the links below. Table of Contents Editorial 3   Contributed Research Articles What’s in a Name? Paul Murrell 5 It’s Not What You Draw,It’s What You Don’t Draw Paul Murrell 13 Debugging grid Graphics Paul Murrell and Velvet Ly 19 frailtyHL: A Package for Fitting...

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Making Data Visually Appealing

December 16, 2012
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Making Data Visually Appealing

I’ve recently been considering the graphical presentation of data. I get the feeling that we, ecologists/scientsits, could be better at data presentation. Graphs must be informative, but they don’t have to be ugly. I think that making visually appealing charts … Continue reading →

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Building R packages: missing path to pdflatex

December 15, 2012
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Building R packages: missing path to pdflatex

Recently whiling trying to build an R package for generalized estimating equation model selection (QICpack on github), I was getting an error related to latex creating the PDF package manuals. It seems like this is a relatively common problem on … Continue reading →

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Data Science, Data Analysis, R and Python

The October 2012 issue of Harvard Business Review prominently features the words “Getting Control of Big Data” on the cover, and the magazine includes these three related articles:“Big Data: The Management Revolution,” by Andrew McAfee and Erik Brynjolfsson, pages 61 – 68;“Data Scientist: The Sexiest Job of the 21st Century,” by Thomas H. Davenport and D.J. Patil, pages...

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Text analysis made too easy with the tm package

December 15, 2012
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Text analysis made too easy with the tm package

Today’s Gist takes the CNN transcript of the Denver Presidential Debate, converts paragraphs into a document-term matrix, and does the absolute most basic form of text analysis: a raw word count. There are actually quite a few steps in this proc...

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Le Monde puzzle (#800)

December 14, 2012
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Le Monde puzzle (#800)

Here is the mathematical puzzle of the weekend edition of Le Monde: Consider a sequence where the initial number is between 1 and 10³, and each term in the sequence is derived from the previous term as follows: if the last digit of the previous term is between 6 and 9, multiply it by 9;

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Predictive models in R: a new book in Polish

December 14, 2012
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Predictive models in R: a new book in Polish

Together with Mateusz Zawisza I have just published a new book in Polish on building predictive models in GNU R. It can be bought at Oficyna Wydawnicza SGH. The book presents complete examples of basic data mining processes.Although the book is in Poli...

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