Monthly Archives: April 2010

R 2.11.0 is released!

April 22, 2010
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R 2.11.0 is released!

The new R 2.11.0 is out! Get it from here. Take a look at these posts for some miscellaneous advices to make the upgrade easier. Also this thread on stackoverflow can be of some value. Feel free to contribute with suggestions about how to upgrade your ...

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R 2.11.0 is released!

April 22, 2010
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R 2.11.0 is released!

The new R 2.11.0 is out! Get it from here. Take a look at these posts for some miscellaneous advices to make the upgrade easier. Also this thread on stackoverflow can be of some value. Feel free to contribute with suggestions about how to upgrade your ...

Read more »

The difference between “letters[c(1,NA)]” and “letters[c(NA,NA)]“

April 22, 2010
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In David Smith’s latest blog post (which, in a sense, is a continued response to the latest public attack on R), there was a comment by Barry that caught my eye. Barry wrote: Even I get caught out on R quirks after 20 years of using it. Compare letters and letters for the most recent thing that made me...

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Free Video Courses on R, Structural Equation Modelling, Causal Inference, and Regression from Uni Jena

April 22, 2010
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Free Video Courses on R, Structural Equation Modelling, Causal Inference, and Regression from Uni Jena

The Department of methodology and Evaluation Research at Universität Jena has made available a set of free online video courses on data analysis.They cover topics that are particularly relevant to psychology and social science researchers, including ...

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R: more plotting fun, this time with the Poisson

April 21, 2010
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R: more plotting fun, this time with the Poisson

Click on image for a larger version. Here is the code:par(bg="black") par(mar=c(0,0,0,0)) plot(sort(rpois(10000,100))/rpois(10000,100),frame.plot=F,pch=20,col="blue")

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Automated way to check for PGF version

April 21, 2010
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This is one way to check for the version of PGF that is installed in an automated way. First create a tex file with the following contents: \documentclass{article} \usepackage{tikz} \batchmode \makeatletter \typeout{PGFVersion=\pgfversion} \@@end Say you named it test-pgf-version.tex. Then: pdflatex test-pgf-version.tex cat test-pgf-verson.log | grep PGFVersion | sed ‘s/PGFVersion=//’ should display the version number. I

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Why use R? Because that’s what the pros use

April 21, 2010
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I had the great pleasure of sitting down for a beer with Steve O'Grady (from the open-source analyst group RedMonk), at the MySQL conference last week. It was great to get the perspective of someone who knows the tech industry so well, sees predictive analytics as a hot area, and is taking an active interest in statistics and R...

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Doing Maximum Likelihood Estimation by Hand in R

April 21, 2010
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Doing Maximum Likelihood Estimation by Hand in R

Lately I’ve been writing maximum likelihood estimation code by hand for some economic models that I’m working with. It’s actually a fairly simple task, so I thought that I would write up the basic approach in case there are readers who haven’t built a generic estimation system before. First, let’s start with a toy example

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Parallel Multicore Processing with R (on Windows)

April 21, 2010
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Parallel Processing backend for R under windows - installation tips and some examples.

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Little R == r

April 21, 2010
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There's big R, the R that I use to do most my work, the environment that makes pretty graphics, et. al. It's like matlab, only cooler. Or more cool. Or less uncool. You can see my prejudices here. Today i discovered little R. It's like big R, only little. Holy shit. Dirk gives...

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