Monthly Archives: December 2009

Visualizing Data in R with ggplot2

December 28, 2009
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Drew Conway presents a brief talk on how to visualize data in R with ggplot2 at the NYC R Statistical Meetup on December 3, 2009.

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SQL group by in R

December 27, 2009
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SQL group by in R

The R statistical computing environment is awesome, but weird. How to do database operations in R is a common source of questions. The other day I was looking for an equivalent to SQL group by for R data frames. You need this to compute summary statist...

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Merry Christmas using R

December 25, 2009
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Yihui creates an Christmas greeting using R: See the R code to create an animated message in Flash here: Keep on Fighting: Merry Christmas Using R

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Because it’s Christmas: Microbe Mario

December 25, 2009
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Because it’s Christmas: Microbe Mario

He's no Father Christmas, but he is dressed in festive red and green, and he's made of bacteria. This image, Mario, was submitted to the 2009 international Genetically Engineered Machine (iGEM) competition by Team Osaka from the nanobiology laboratories at the University of Osaka, Japan. They genetically engineered bacteria to express fluorescent proteins and carotenoid pigments to create works...

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Another Visualization of Unemployment

December 24, 2009
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Another Visualization of Unemployment

One of the problems with choropleths is that, as explained by Hadley Wickham in this presentation, big states tend to draw more attention because of their size, but they also tend to have a low population Density. For example, Mexico City, the capital ...

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Error : .onLoad failed in ‘loadNamespace’ for ‘RWeka’

December 24, 2009
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Error : .onLoad failed in ‘loadNamespace’ for ‘RWeka’

After installing Weka/RWeka in R, you may get this error if you try to load RWeka in the same session: require(RWeka) Cannot create Java virtual machine (-4) Error : .onLoad failed in 'loadNamespace' for 'RWeka' Solution: Just close R and re-open it. Cause: Apparently the installation requires some initialization. Tested on R 2.10.1 on Windows

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A web-based graphics application based on R

December 24, 2009
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A web-based graphics application based on R

FlowingData recently took a look at Jeroen Ooms' latest web-based statistical tool based on R. We've looked at his tools for random-effects models and finance visualizations before, but this one is a more general tool for creating graphs from data sets using the ggplot2 package. It's pretty slick. All you need to do is upload a data set (in...

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Beancounter minor bug fix release 0.8.9

December 23, 2009
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Another small update to beancounter and just like the previous release due to changes in Perl's Date::Manip. It seems that Date_Calc now really wants a reference to store error codes, so we supply one. I also changed the FX code to use OandA ad there ...

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Compare performance of machine learning classifiers in R

December 23, 2009
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Compare performance of machine learning classifiers in R

This tutorial demonstrates to the R novice how to create five machine learning models for classification and compare the performance graphically with ROC curves in one chart. For a simpler introduction, start with Plot ROC curve and lift chart in R. # ...

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R in India: The Hindu

December 23, 2009
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The Hindu, a leading English-language newspaper in India, published an article on December 21 about doing research with open-source tools and R got a prominent mention: Though commercial statistical packages are popular among researchers, their licensing costs drive people away from them. In this context, R https://www.r-project.org, the open source/free statistical package, which is fast becoming the darling of...

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