Monthly Archives: April 2011

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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Violin and boxplots with lattice and R

Violin and boxplots with lattice and R

A violin plot is a combination of a boxplot and a kernel density plot. Lattice includes the panel.violin function for this graphical tool. This example draws a violin and a boxplot together. First, let’s download some solar radiation data from the NASA webpage: nasafile <- 'http://eosweb.larc.nasa.gov/sse/global/text/global_radiation' nasa <- read.table(file=nasafile, skip=13, header=TRUE) Now, I plot a

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A very short and unoriginal introduction to snow

April 2, 2011
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As Jian-Feng rightly pointed out in a comment on my guide to setting up snow on the OSC cluster, it was probably somewhat cavalier of me to say: Getting snow to run properly on single machines, or ever with a cluster of … Continue reading →

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Find NHL Players with 30 Goals and 100 PIM using R

April 2, 2011
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Find NHL Players with 30 Goals and 100 PIM using R

Last week Jack Edwards raised the fact that Milan Lucic was the first Bruin player to join the 30 Goal / 100 Penalty Minute club in a few years.  It got me thinking about the other players who have accomplished … Continue reading →

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Plot the Scoring Streak of an NHL Player with R

April 1, 2011
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Plot the Scoring Streak of an NHL Player with R

I am a big Boston Bruins fan and have enjoyed the ups and downs over the last few years, regardless of the catastrophes that have occurred during the playoffs.  The team struggled a few weeks ago, but have recently seemed … Continue reading →

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