New Fantasy Ball Junkie Article

July 30, 2010
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New Fantasy Ball Junkie Article

I have a new post up over at Fantasy Ball Junkie looking at the value of closers in H2H leagues from here on out. I simply simulated in the same way as the Stolen Bases and Home Runs articles from before. Saves are an interesting bunch, and it really...

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inline 0.3.6

July 30, 2010
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I released inline 0.3.6 yesterday. This is a minor release which gives better R level errors when there is a compiler error. For example : > tryCatch( cxxfunction( , 'int x = 3 ; x+ ; return R_NilValue ; ' ), error = function(e) print(e$message)...

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Visualizing 3d data – plotting quartiles separately

July 30, 2010
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Visualizing 3d data – plotting quartiles separately

In this previous post, we’ve looked at displaying three dimensional data.  One major problem is when there is a high density of data, it can be difficult to see what’s going on in a 3 dimensional plot. One way of looking at the data in more detail is to break it up.  Take a look

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Using Optmatch and RItools for Observational Studies

July 29, 2010
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Using Optmatch and RItools for Observational Studies

I am a contributor to the optmatch and the RItools packages for R. These two packages are separate, but complimentary. Both packages provide tools for adjusting observational data to exhibit “balance” on observed covariates. In a randomized control trial, treatment and control groups should have identical distributions over all covariates, observed and unobserved. Matching provides a...

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The Mule goes SURFing

July 29, 2010
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A month ago I posted about “SURF”, the newly-established Sydney R user forum (R being an excellent open-source statistics tool). Shortly after publishing that post, I attended the inaugural forum meeting. While we waited for attendees to arrive, a few people introduced themselves, explaining why they were interested in R and how much experience they

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RcppArmadillo 0.2.4

July 29, 2010
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A new release of RcppArmadillo is now on CRAN. RcppArmadillo makes it easy to write highly efficient and highly readable C++ code for linear algebra (based on Armadillo) in R extensions (using Rcpp for the interface). This release upgrades the include...

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RcppArmadillo 0.2.4

July 29, 2010
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A new release of RcppArmadillo is now on CRAN. RcppArmadillo makes it easy to write highly efficient and highly readable C++ code for linear algebra (based on Armadillo) in R extensions (using Rcpp for the interface). This release upgrades the incl...

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Red-R

July 29, 2010
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Red-R

Red-R seems to have some interesting ideas behind it. Of course it needs some time to mature.

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IMIS & AMIS

July 29, 2010
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IMIS & AMIS

A most interesting paper by Adrian Raftery and Le Bao appeared in the Early View section of Biometrics.  It aims at better predictions for HIV prevalence—in the original UNAIDS implementation, a naïve SIR procedure was used, based on the prior as importance function, which sometimes resulted in terrible degeneracy—, but its methodological input is about

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Pie Charts in ggplot2

July 29, 2010
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Pie Charts in ggplot2

...and other isomorphic data shape presentations...The Pie Chart has been widely criticized in recent times by statisticians.  Edward Tufte goes as far as to call this the "prevailing orthodoxy."  The reasons generally cited:The rel...

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A free book on probability and statistics with R

July 29, 2010
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G Jay Kerns has published a 400+ page introductory text on Probability and Statistics. All of the examples and illustrations are done using R (as Jay puts it, "The people at the party are Probability and Statistics; the handshake is R") so if you want to brush up on your probability and learn R at the same time, this...

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Bootstrap, strap-on, anal-yzing… statistics is getting weirder by the moment

July 29, 2010
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Bootstrap, strap-on, anal-yzing… statistics is getting weirder by the moment

I have spent the better portion of the day trying to get a bootstrap working. I have adapter a pre-written bootstrap function, but I wanted to use a generic function, mostly for reaping fame and glory. My hypothesis was that writing a hand-written, unoptimized function will consume more computer time than the generic, presumably optimized,

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Taking R to the Limit: Parallelization

July 29, 2010
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Taking R to the Limit: Parallelization

Video, slides and code of the talk “Taking R to the Limit: Parallelization” by Ryan Rosario at the Los Angeles area R Users Group in July 2010 as follows. Slides: R code: here. Video: If you have a question to … Continue reading →

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Notes from useR! 2010

July 29, 2010
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Notes from useR! 2010

R is a free software environment for statistical computing and graphics, used by a growing number of economists, engineers, and data analysts every day at Google. We’ve even published our R Style Guide on Google Code. The R community has...

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Notes from useR! 2010

July 29, 2010
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Notes from useR! 2010

R is a free software environment for statistical computing and graphics, used by a growing number of economists, engineers, and data analysts every day at Google. We’ve even published our R Style Guide on Google Code. The R community has...

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Taking R to the Limit, Part I – Parallelization in R

July 28, 2010
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Taking R to the Limit, Part I – Parallelization in R

Tuesday night I had the opportunity to present on high performance computing in R, and the Los Angeles R Users’ Group. There was so much to talk about that I had to split my talk into two parts. The first part was parallelization and the second ...

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Blogging about R – presentation and audio

July 28, 2010
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At the useR!2010 conference I had the honor of giving a (~15 minute) talk titled “Blogging about R”. The following is the abstract I submited, followed by the slides of the talk and the audio file of a recording I made of the talk (I am sad it got a bit of “hall echo”, but it’s still listenable…) P.S:...

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RUG Introduction: Los Angeles area R Users Group

July 28, 2010
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RUG Introduction: Los Angeles area R Users Group

A nice group of people from academia and industry meeting about once a month at UCLA. Attendance is usually 30-40, but gradually increasing (also about 300 registered members). If you’d like to join, visit the group’s website: http://www.meetup.com/LAarea-R-usergroup/, you’ll find … Continue reading →

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IPSUR book used LyX-Sweave

July 28, 2010
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Jay Kerns wrote a book titled "Introduction to Probability and Statistics Using R" or IPSUR for short. He has put up a web site for the book and Rcmdr plugin. There are at least two very important points from my side (I did not read the book, yet): 1. ...

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IPSUR book used LyX-Sweave

July 28, 2010
By

Jay Kerns wrote a book titled "Introduction to Probability and Statistics Using R" or IPSUR for short. He has put up a web site for the book and Rcmdr plugin. There are at least two very important points from my side (I did not read the book, yet): 1. ...

Read more »

Taking R to Eleven

July 28, 2010
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R, the open-source statistical software system, is certainly a hot topic these days. It's been the subject of increasing media interest over the last year or so, and the user community is expanding rapidly: there are now about 40 R user groups around the world, and last week's worldwide R User Conference was the most successful ever. So why...

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Extension to an R Package: brew gets a weave

July 28, 2010
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I’ve had enough of copy and pasting output from my R session into my email editor, blog, etc. I need something like Sweave for plain text files. In particular, I want the result of parsing <<echo=TRUE>>= f <- function(x) { x + 1 } f(1) @ with Sweave, but without the latex markup. For example,

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Social contagion? Maybe not…

July 28, 2010
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Social contagion? Maybe not…

Recently there was a lot of racket about results presented in papers by a pair Nicholas Christakis & James Fowler. Their papers gained a lot of attention both in the academic world as well as in media. In their papers they claim to provide evidence for social contagion (transmission through social networks) of several types

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Seamless R and C++ integration

July 28, 2010
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Seamless R and C++ integration

Video of the talk “Seamless R and C++ integration” by Dirk Eddelbuettel at the Los Angeles area R Users Group in March 2010 (to see the video in a larger size, click inside the video but outside the play button):

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Web applications with R

July 28, 2010
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Web applications with R

Video of the talk “Web applications with R” by Jeroen Ooms at the Los Angeles area R Users Group in January 2010:

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Juggling with fire

July 27, 2010
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People were juggling with fire sur la place de la Comedie tonight in Montpellier

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Revolution in the News

July 27, 2010
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Revolution's CEO Noman Nie has been busy recently spreading the good word about R and Revolution. Here's a quick roundup: In an audio interview with Mary Joe Nott at B-eye Network, Norman talks about the "perfect storm" around R, "the most complete statistical tool in the world". In Business Management magazine, Norman Nie describes how predictive analytics is changing...

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A summer of books

July 27, 2010
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A summer of books

The summer started with a research in pair session in CiRM on the R edition of Bayesian Core, but I am also involved two other book projects. The first one was mentioned in a previous post, namely the translation of Introducing Monte Carlo Methods with R into French. I have now recovered all translated chapters,

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Hadley Wickham’s ggplot2 / Data Visualization Course Materials

July 27, 2010
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Hadley Wickham, creator of ggplot2, an immensely popular framework for Tufte-friendly data visualization using R, is teaching two short courses at Vanderbilt this week. Once we opened registration to Vanderbilt students and staff we instantly filled al...

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