April 2010

Quick and dirty parallel processing in R

April 30, 2010 | Abhijit

R has some powerful tools for parallel processing, which I discovered while searching for ways to fully utilize my 8-core computer at work. What surprised me is how easy it is…about 6 lines of code, if that. Given that I wasn’t allowed to install heavy duty parallel-processing systems like ... [Read more...]

How many girls, how many boys?

April 30, 2010 | Matt Asher

I found this interesting question over here at mathoverflow.net. Here’s the question: If you have a country where every family will continue to have children until they get a boy, then they will stop. What is the proportion of boys to girls in the country. First off, there ...
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Which font uses the most ink?

April 30, 2010 | David Smith

If you're being particularly cost-conscious about your use of printer ink or toner, you may be wondering which font you should choose to minimize ink use. Here's an infographic with the answer: This is an interesting infographic in its own right, but what makes it cool is that these are ... [Read more...]

Data Manipulation with R – Spector (2008)

April 30, 2010 | bryan

Title: Data Manipulation with RAuthor(s): Phil SpectorPublisher/Date: Springer/2008Statistics level: N/A Programming level: Intermediate Overall recommendation: Highly recommended If there is one book that every beginning R user coming from a programming background should have, it is Spector’s Data Manipulation with R. New R users with ... [Read more...]

Data Manipulation with R – Spector (2008)

April 30, 2010 | bryan

Title: Data Manipulation with RAuthor(s): Phil SpectorPublisher/Date: Springer/2008Statistics level: N/A Programming level: Intermediate Overall recommendation: Highly recommended If there is one book that every beginning R user coming from a program... [Read more...]

hash-2.0.0

April 30, 2010 | Christopher Brown

Come see my talk on hashes in R at useR! 2010. (http://user2010.org/) July 20-23 National Institute of Standards and Technology (NIST), Gaithersburg, Maryland, USA [Read more...]

5 Minute Analysis in R: Case-Shiller Indices

April 29, 2010 | Lee

The Case-Shiller Home Price Indices measure residential home values for 20 cities in the US, with some indices going all the way back to the 80s. With housing prices all the rage these days, we should perform a quick-and-dirty analysis using R to see what we can glean from this rich ...
[Read more...]

Research in pair next summer

April 29, 2010 | xi'an

Today I received the very good news that our proposal with Jean-Michel Marin to undertake “research in pair” in CIRM, Luminy, a fortnight next summer was accepted! This research centre in Mathematics is a southern and French version of the renowned German centre of Oberwolfach and, while I would have ... [Read more...]

Getting a Web application to talk to R

April 29, 2010 | David Smith

Let's face it: you can do some pretty awesome things with R -- statistical models, beautiful charts, you name it -- but if the only way to do those things is from the R command line you're limiting the audience of people who might make use of all this awesomeness ... [Read more...]

JAGS 2.0

April 29, 2010 | jackman

Is out. On sourceforge. Along with a new rjags. Thanks Martyn. I’m looking forward to working my way through some of the improvements, which include block-updating of parameters in GLMs more use of R’s d/p/q family of functions for den... [Read more...]

Tipping heuristics

April 28, 2010 | dan

INCREDIBLY SIMPLE CALCULATIONS MADE SIMPLE Yes, we all know how to calculate 15% or 20% exactly, but it’s fun to use tipping heuristics and even more fun to make crowded graphs of how they compare to each other. (Sorry for the junky chart. Open for suggestions, in the words of Tom ... [Read more...]

R Beginner’s Guide Book Update 4/28/2010

April 28, 2010 | John Quick

Update: Statistical Analysis with R is now available!I am writing to update you on the progress of my R Beginner's Guide book, which is to be published through Packt. I have really gotten to work over the past couple months and have recently completed ...
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Sweave vs. pgfSweave

April 28, 2010 | Shige

I think pgfSweave should replace the default of Sweave system because it brings significant improvements over the original Sweave. I certain have made it my default Sweave tool on my system.------------------------------- EDITED ON MAY 1, 2010 --------...
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Annotating Lattice Box and Whisker Plots

April 28, 2010 | dylan

bwplot annotation example Sometimes you want to add a little text to box and whisker plots produced by the lattice function bwplot(). Here is one approach. Could be optimized a bit more to reduce manual specification of some elements. Suggestions welcomed. read more
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Analysis of Covariance – Extending Simple Linear Regression

April 28, 2010 | Ralph

The simple linear regression model considers the relationship between two variables and in many cases more information will be available that can be used to extend the model. For example, there might be a categorical variable (sometimes known as a covariate) that can be used to divide the data set ...
[Read more...]

Interview with Revolution CEO Norman Nie

April 28, 2010 | David Smith

Steve Miller has posted his interview with Revolution's CEO Norman Nie at Information Management blogs. In the interview, Steve digs into Norman's motivations for taking on a new venture around R after his successes with SPSS and how what he learned there applies to Revolution Computing. Also up for discussion: ... [Read more...]

Bhapkar V test

April 28, 2010 | Todos Logos

This is the code to perform the Bhapkar V test. I've rapidly wrote it, in 2 hours. The code is then quite brutal and it could be done better. As soon as possible, I will correct it.WARNING: it works *ONLY* with 3 groups, for now!bhapkar.test.3g sample for(i ... [Read more...]
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