A post on FlowingData blog demonstrated how to quickly make a heatmap below using R base graphics. This post shows how to achieve a very similar result using ggplot2. Data Import FlowingData used last season’s NBA basketball statistics provided by databasebasketball.com, and the csv-file with the data can ... [Read more...]

The blog Offensive Politics has done some in-depth analysis of the recent Senate special-election upset in Massachusetts, comparing the results of victorious Republican candidate Scott Brown to those of the unsuccessful Republican Presidential candidate John McCain in 2008. It's pretty clear that Brown out-performed expectations with Democratic voters, but this chart ... [Read more...]

We're so excited here at REvolution Computing to announce that Robert Gentleman has joined our board of directors. Robert is one of the two originators of the R Project: a research project between Robert and Ross Ihaka in 1996 was the genesis of the R language. (Both Robert and Ross were ... [Read more...]

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CRAN contains ready-made binary packages for nearly all of its packages, but rgdal is one which I keep finding myself trying to install from source whenever I upgrade R. Compiled versions of rgdal, along with prerequisites and complements like the GDAL framework, GRASS, and even the old FFTW3 can be ... [Read more...]

Interaction variables introduce an additional level of regression analysis by allowing researchers to explore the synergistic effects of combined predictors. This tutorial will explore how interaction models can be created in R.Tutorial Files Before we... [Read more...]

Found this nice way to visually summarize contingency tables using ggplot2 in R on Hadley Wickham's ggplot2 cheat sheet. Using the same data in my previous post on making scatterplots in small multiples, I'll demonstrate how to use ggfluctuation() to m... [Read more...]

In 2007, I was introduced to Twitter via the written qualifying exam towards my Ph.D.. At first, I did not know what to do with it. After a good year or so (maybe even sooner) passed, I began to follow some very interesting people that share the same interests as ... [Read more...]

There's a new local R User Group starting up in Philadelphia. Alex McClung and Jeremy Leipzig have set up a website for the Philly UseR Group to get things started, so if you're in the area join up and tell them what you'd like from the group. Also, the DC ... [Read more...]

Jeroen Ooms' BARUG talk on Web Development with R is now available (with thanks again to Drew Conway): If you want to try the web based apps Jeroen demos in the video yourself, you can find links at Jeroen's homepage (along with the slides for his talk). Click on the ... [Read more...]

Here's a fascinating video that looks at the exponential growth of broadband technology and network-based models ... uh ... who am I kidding? This video has nothing to do with R, statistics, or open-source. It's about cats. But it's funny. And it's Friday. (Some slightly NSFW language, but it's in a strong ... [Read more...]

Emmanuel Paradis, the mastermind behind 'ape' has struck again. This time he brings us the 'pegas' package, the Population and Evolutionary Genetic Analysis system. This package has a function that collapses the haplotypes (unique DNA sequences) in a DNA alignment, something which is extremely useful in various analyses and in ... [Read more...]

A quick nine days after release 0.7.2 of Rcpp, our R / C++ interface classes, Romain and I are happy to roll out a new version 0.7.3. It has been uploaded to CRAN and Debian, and mirrors should have the new versions shortly. As before, my local page... [Read more...]

Download "Getting Started with the Social Media Analytics Research Toolkit" (pdf, 1.25 megabytes) Download the Social Media Analytics Research Toolkit Media Inactivist, Thought Follower, Sit-Down Comic, Social Media Analytics Researcher, Former Boy Gen... [Read more...]

Just a reminder that I will teach a very short course on March 17 in San Antonio, Texas, based on our “Introducing Monte Carlo Methods with R” book, in the first day of the meeting  Frontiers of Statistical Decision Making and Bayesian Analysis, in honour of Jim Berger, There still are ... [Read more...]

FlowingData has just posted a nice step-by-step tutorial on how to make a heat-map in R, like this one on attributes of NBA scorers: If you want to take the concept a step further with time-series data, you can also create calendar heat-maps in R. For example, you can track ... [Read more...]

Presentations given at the Bay Area useR Group on January 10, 2010 by Jeroen Ooms, on how to create web applications use R. UPDATE: To view an alternative HD quality click here [Read more...]

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With the NIfTI-1 header extensions the world is your oyster.  We decided that one use for such a capability is to keep an audit trail of all operations performed on the image data volume.  This is a key feature in the dcemriS4 package.  ... [Read more...]

Preparations are well underway for the annual R user conference useR! 2010, to be held at NIST (about 25 miles outside of Washington, DC) July 20-23. This meeting is a true user conference: almost all of the presentations at the conference are contributed by ordinary R users. So, to continue the success ... [Read more...]