Monthly Archives: April 2011

RQuantLib Windows binary on CRAN

April 4, 2011
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Dirk Eddelbuettel has recently released RQuantLib-0.3.7, which contains the necessary QuantLib builds to allow the CRAN servers to build the Windows binary.This (thankfully) makes my post on how to build RQuantLib on 32-bit Windows unnecessary for casu...

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The structure of twitter participant relationships in conversations around #Libya, #Bieber, and #Rstats

April 4, 2011
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I am a recent comer to twitter, and it took me a few weeks to figure out what this was all about. Who are all these people tweeting each other and what do all these trending hashtags mean? Do these … Continue reading →

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Day #16-17 R-scripting templates in knime

To install the community nodes in knime: help > install new software > http://tech.knime.org/update/community-contributions/release you’ll only need the “R and Groovy scripting extensions for KNIME” What is it and what does it...

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Day #17 Creating your own R-scripting-template

First, go take a look at this website: http://rgg.r-forge.r-project.org/docs.html At “6. RGG Elements” you can see which GUI elements you can give to the user and which functions they have. Then, open a textfile and call it however you want...

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RQuantLib 0.3.7

April 4, 2011
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A build-fix release RQuantLib 0.3.7 is now on CRAN and in Debian. RQuantLib combines (some of) the quantitative analytics of QuantLib with the R statistical computing environment and language. Thanks to the help by Brian Ripley (who compiled Quan...

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RcppArmadillo 0.2.18

April 4, 2011
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Conrad Sanderson made a bug-fix release (1.1.92) by for his wonderful Armadillo templated C++ library for linear algebra appeared yesterday and as usual a new release 0.2.18 of RcppArmadillo, our Rcpp-based integration into R is now on CRAN mirrors. ...

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How to Shade Under a Normal Density in R

April 3, 2011
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How to Shade Under a Normal Density in R

The easiest-to-find method for shading under a normal density is to use the polygon() command. That link is to the first hit on Google for "Shading Under a Normal Curve in R." It works (like a charm), but it is not the most intuitive way to let users p...

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Feed Your (Machine) Brain

April 3, 2011
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Feed Your (Machine) Brain

Few can tell you what goes into a chicken nugget, but most will agree that it's good for your brain. If you're a little sluggish and can't focus, what do you normally do? That's right, you pop a couple chicken nuggets. And similar to our brains, our al...

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Interestingness Measures

Interestingness Measures

Probably because I first encountered them somewhat late in my professional life, I am fascinated by categorical data types.  Without question, my favorite book on the subject is Alan Agresti’s Categorical Data Analysis (Wiley Series in Probabili...

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Maps of solar radiation

Maps of solar radiation

The Atmospheric Science Data Center (ASDC) at NASA Langley Research Center offers several data sources. For example, it is possible to download a text file with the 22-year (July 1983 – June 2005) monthly and annual average of global horizontal irradiation. nasafile <- 'http://eosweb.larc.nasa.gov/sse/global/text/global_radiation' nasa <- read.table(file=nasafile, skip=13, header=TRUE) With this data, R and the

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