Ross Ihaka in Sunday Star Times

July 6, 2010
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Ross Ihaka in Sunday Star Times

New Zealand's Sunday Star Times last weekend featured a profile on Ross Ihaka, co-creator of R: The down-to-earth associate statistics professor and his fellow researcher Robert Gentleman are famous around the world for developing R programming – a "glorified calculator" that crunches data. R programming allows for statistical computing and graphics and is used by thousands of companies worldwide...

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New versions of plyr, ggplot2 released

July 6, 2010
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Hadley Wickham has announced that new versions of his popular grammar-of-graphics charting package ggplot2 and his general-purpose data reshaping tool plyr for R are now available. plyr boasts several new features, most notably a new join function which should simplify what can sometimes be a difficult process in R: merging two data sets. A simplified SQL-like terminology should make...

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Example 8.1: Digits of Pi

July 6, 2010
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Example 8.1: Digits of Pi

Do the digits of Pi appear in a random order? If so, the trillions of digits of Pi calculated can serve as a useful random number generator. This post was inspired by this entry on Matt Asher's blog. Generating pseudo-random numbers is a key piece o...

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R goes to StackExchange

July 6, 2010
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R goes to StackExchange

“What’s the big deal? We already have the r-help mailing list.” No, it’s a big deal. Really. Have you forgotten the joys of being a first-year R user, either begging advice off of friends or using Google to search archives of the R-help list? (Firefox has a dedicated search add-on for the R-help archives.) Yes,

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oro.nifti 0.2.0

July 6, 2010
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The latest version of oro.nifti (0.2.0) has been released on CRAN.  New features include:Reduced overall size of the package by an additional 50% This is a 75% reduction in total from version 0.1.4Four-dimensional acquisitions are now re-orient...

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oro.nifti 0.2.0

July 6, 2010
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The latest version of oro.nifti (0.2.0) has been released on CRAN.  New features include:Reduced overall size of the package by an additional 50% This is a 75% reduction in total from version 0.1.4Four-dimensional acquisitions are now re-orient...

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New versions for ggplot2 (0.8.8) and plyr (1.0) were released today

July 6, 2010
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New versions for ggplot2 (0.8.8) and plyr (1.0) were released today

As prolific as the CRAN website is of packages, there are several packages to R that succeeds in standing out for their wide spread use (and quality), Hadley Wickhams ggplot2 and plyr are two such packages. And today (through twitter) Hadley has updates the rest of us with the news: just released new versions of plyr and ggplot2. source...

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Creating a Presentation with LaTeX Beamer – Basic Slides

July 5, 2010
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Creating a Presentation with LaTeX Beamer – Basic Slides

In a previous post we looked at using the LaTeX beamer package to create presentations. Given a title page and outline of a presentation the next stage will be to create the content that appears in various slides of the presentation. Fast Tube by Casper To create a slide we make use of the frame environment and

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Ajax using JQuery to Sinatra (and a Barplot using R)

July 5, 2010
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Ajax using JQuery to Sinatra (and a Barplot using R)

Part of what attracted me to R was the ease and efficiency in using the language for tasks for which it was designed.  R is a tool among that can be used to do great things with minimal effort.  This post illustrates some other tools and tech...

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Go Guerrill… R on Your Data in August

July 5, 2010
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Go Guerrill… R on Your Data in August

Only one month to go! Register now for the Guerrilla Data Analysis Techniques (GDAT) class to be held during the week of August 9-13, 2010. The focus will be on using R and the PDQ-R for computer performance analysis and capacity planning.(Click on t...

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Go Guerrill… R on Your Data in August

July 5, 2010
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Go Guerrill… R on Your Data in August

Only one month to go! Register now for the Guerrilla Data Analysis Techniques (GDAT) class to be held during the week of August 9-13, 2010. The focus will be on using R and the PDQ-R for computer performance analysis and capacity planning.(Click on t...

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Prime Parallels for Load Balancing

July 5, 2010
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Prime Parallels for Load Balancing

Having finally popped the stack on computing prime numbers with R in Part II and Part III, we are now in a position to discuss their relevance for computational scalability.My original intent was to show how poor partitioning of a workload can defeat the linear scalability expected when full parallelism is otherwise attainable, i.e., zero...

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Prime Parallels for Load Balancing

July 5, 2010
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Prime Parallels for Load Balancing

Having finally popped the stack on computing prime numbers with R in Part II and Part III, we are now in a position to discuss their relevance for computational scalability.My original intent was to show how poor partitioning of a workload can defeat the linear scalability expected when full parallelism is otherwise attainable, i.e., zero...

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Hacker News Religion Poll

July 5, 2010
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Hacker News Religion Poll

Hacker News user post polls from time to time - the following code constructs a bar chart based upon the responses to a recent poll on the stated religious affiliation of Hacker news users (parsed straight from the site).  The chart above is as of...

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Make R speak SQL with sqldf

July 5, 2010
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Make R speak SQL with sqldf

The R community is unique as programming communities go.  Many users of R come from academia and have a relatively extensive mathematical background.  The R community has developed in relative isolation from some other areas of programming th...

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Convergence diagnostics with MCMCglmm

July 5, 2010
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Convergence diagnostics with MCMCglmm

MCMCglmm does not produce more than one chain. So the way to check convergence is to run the model twice, each with different starting values, then conduct the diagnostic with:gelman.diag(m1$Sol, m2$Sol)

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Excellent R Code Format Package

Excellent R Code Format Package

I have been looking for this type of package for several days, and luckily found it today. Unquestionable R is powerful, however, R programming is unfriendly as far as I concern, mainly due to the lack of format shortcut, which makes the R codes rathe...

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Happy 4th of July

July 3, 2010
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Happy 4th of July

library(maps)states <- data.frame(map("state", plot=FALSE))plot(states, type = "l", col = "navy", axes = FALSE, xlab = "", ylab = "")title("Happy 4th of July",  col.main = "red")

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Europe Data set:> eurodist                 Athens Barcelona…

July 3, 2010
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Europe
Data set:> eurodist                 Athens Barcelona…

Europe Data set:> eurodist                 Athens Barcelona Brussels Calais Cherbourg Cologne CopenhagenBarcelona         3313                                                   

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Get up and running with R, Sweave, and LaTex

July 2, 2010
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Get up and running with R, Sweave, and LaTex

There are a lot of great references on the web on how to levarage LaTeX for reporting and presentations (beamer), but as someone who is completely new to R and reproducible research, I was having a pretty hard time figuring out simply what to do (what tools, where do you edit, etc.). Eclipse as a

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Visualization of regression coefficients (in R)

July 2, 2010
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Visualization of regression coefficients (in R)

Update (07.07.10): The function in this post has a more mature version in the “arm” package. See at the end of this post for more details. * * * * Imagine you want to give a presentation or report of your latest findings running some sort of regression analysis. How would you do it? This was exactly the question...

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The case of the missing zeroes

July 2, 2010
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The case of the missing zeroes

Political polling is a big industry these days, especially here in the US, and both mainstream news outlets and many of the bigger political blogs commission their own polls to measure (for example) the popularity of a sitting or candidate politician or policy. In the last week though, a very public spat has erupted between the left-leaning political blog...

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Creating a Presentation with LaTeX Beamer – Getting Started

July 2, 2010
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Creating a Presentation with LaTeX Beamer – Getting Started

The LaTeX beamer package can be used to create appealing presentations for many applications. A working knowledge of LaTeX is required but once the initial learning curve and transition is made from a visual word processor to a markup based approach the benefits are worth the initial investment of time. Title Pages In a previous post we

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An experiment in A/B Testing my Résumé

July 1, 2010
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An experiment in A/B Testing my Résumé

Objective I’ll admit it: my résumé doesn’t stand out. I’ve had some great internships, but also a tendency to work for companies that aren’t (yet!) household names. And though I’m doing fine academically, it’s not well enough to stand out … Continue reading →

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Maps without map packages

July 1, 2010
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Maps without map packages

LATITUDE + LONGITUDE + OVERPLOTTING FIX = MAPS Decision Science News is always learning stuff from colleague, physicist, mathlete, and all-around computer whiz Jake Hofman. Today, it was a quick and clean way to make nice maps in R without using any map packages: just plot the latitude and longitude of your data points (e.g.

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UseR! 2010 registration extended until July 4

July 1, 2010
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Registration for the worldwide R user conference, useR! 2010, closed on June 20. But it seems like a few folks weren't aware of the early deadline, and missed out on registering. Never fear! Due to overwhelming demand, registration has re-opened until midnight on July 4. You'll need to hurry -- there are only 30 spots left -- so get...

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Call for Papers: Special Issue in JSS for "Magnetic Resonance Imaging in R"

July 1, 2010
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Call for Papers: Special Issue in JSS for "Magnetic Resonance Imaging in R"

We hereby call for the submission of original papers for a Special Issue of the Journal of Statistical Software (JSS - http://www.jstatsoft.org)Magnetic Resonance Imaging in R planned for Summer 2011. The deadline for submission is October 31, 2...

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Call for Papers: Special Issue in JSS for "Magnetic Resonance Imaging in R"

July 1, 2010
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Call for Papers: Special Issue in JSS for "Magnetic Resonance Imaging in R"

We hereby call for the submission of original papers for a Special Issue of the Journal of Statistical Software (JSS - http://www.jstatsoft.org)Magnetic Resonance Imaging in R planned for Summer 2011. The deadline for submission is October 31, 2...

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Can you spot the Error?

July 1, 2010
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Can you spot the Error?

Peter Huber referred to “the rawness of raw data”, a kind of data we would not expect to find in a textbook. The book of Fahrmeir and Tutz on multivariate modelling refers to the visual impairment data from Liang et al., 1992 in table 3.12: Nothing wrong here at first sight; but how would you

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