I like politics; I don’t like all of the lying involved.  If you ask me, I think that there should be “Ethics Committee” investigations into all of the lying.  Sure, tweeting a picture of your junk is probably not the … Continue reading → [Read more...]

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I’m talking tomorrow at useR! on making ggplots interactive with the gWidgets GUI framework. For those of you at useR, here is the code and data, so you can play along on your laptops. For everyone else, I’ll make the slides available in the next few days so ... [Read more...]

"The R-Files" is an occasional series from Revolution Analytics, where we profile prominent members of the R Community. Name: Martyn Plummer Occupation: Statistician at International Agency for Research on Cancer Nationality: British Years Using R: 16 Known for: Member of R core group; member of R Journal editorial board Martyn Plummer ... [Read more...]

Ray Brownrigg – Tips and Tricks for young R programmers Problem: Calculate the distribution function of a bivariate Kolomogorov Smirnoff statistic. Essentially three loops. Basic exhaustive search is O(N^3). Fortran gives a single order of magnitude speed-up. Restructuring in R using a single loop is an order faster than fortran. ... [Read more...]

Alliterations aside, here is a preview of something I’ve been tinkering with. My goal is to be able to run …Continue reading » [Read more...]

L Collingwood – RTextTools RTextTools. A machine learning library for automated text classification. This package builds on previous packages such as tm and random forests. Use case: undergrad labels congressional bills but then quits. Using the previously labelled data, automatically classify the remaining documents. The speaker gave a nice overview of ... [Read more...]

The RevoScaleR package isn’t open source, but it is free for academic users. Collect and storing data has outpaced our ability to analyze it. Can R cope with this challenge? The RevoScaleR package is part of the revolution R Enterprise. This package provides data management and data analysis. Uses ... [Read more...]

RTextTools v1.2 was released today and we're pleased to announce that the package is finally available on CRAN. Additionally, this update brings minor changes to the API, improvements to the GLMNET algorithm, and more comprehensive documentation. Get started by following our installatio [...] [Read more...]

A couple of days ago we released a package named fun to CRAN, but I did not dare to send an announcement to [email protected] as usual. This package is a collection of some classical computer games (e.g. the Mine sweeper and Five in a row) as well ... [Read more...]

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Handling Large Data with R The following experiments are inspired from this excellent presentation by Ryan Rosario: http://statistics.org.il/wp-content/uploads/2010/04/Big_Memory%20V0.pdf. R presents many I/O functions to the users for reading/writing data such as ‘read.table’ , ‘write.table’ -__ http://cran.r-project.... [Read more...]

R Core member Professor Brian Ripley from Oxford University gave the first keynote presentation of useR! 2011 today, and gave some insights into what goes on behind the scenes to create two updates to R (plus several patches) every year. He began with some facts about the history of R (noting ... [Read more...]

I gave my talk to the useR! 2011 conference this morning: The R Ecosystem. The goal of the talk was to show R in context: that the combination of the R project and its leadership, the R userbase, and the companies supporting and using R makes for a thriving ecosystem and ... [Read more...]

In order to provide an option to compare graphs produced by basic internal plot function and ggplot2, I recreated the figures in the book, 25 Recipes for Getting Started with R, with ggplot2. The code used to create the images is in separate paragraphs, allowing easy comparison. Read More: 336 Words Totally [Read more...]

Background: Donkeys in Kenya. Tricky to find the weight of a donkey in the “field” – no pun intended! So using a few measurements,  estimate the weight. Other covariates include age. Standard practice is to fit: for adult donkeys, and other slightly different models for young/old and ill donkeys. What ... [Read more...]

Example: Car seat occupation: Algorithm must decide whether airbag opens: Must open for adult but not for small child or if the seat if empty a few others I missed. Key questions are: What type of design: 32 run regular fractional factorial Response measurement – depends on dummy position, so repeat for 3 ... [Read more...]

Wilem Ligtenberg – GPU computing and R Why GPU computing – theoretical GFLOPs for a GPU is three times greater than a CPU. Use GPUs for same instruction multiple data problems (SIMD). Initially GPUs were developed for texture problems. For example, a wall smashed into lots of pieces. Each core handled a ... [Read more...]

If one checks out the initial question that prompted this series, a common theme in the answers is that one should use the GUI as a tool to help one build code (and not just as a crutch to do the analysis). Being able to view the code produced by ... [Read more...]