Monthly Archives: March 2010

R-bloggers (with ~50 blogs) has just crossed the 1000 subscribers mark!

March 3, 2010
By
R-bloggers (with ~50 blogs) has just crossed the 1000 subscribers mark!

I am very happy to discover so many of you readers are interested in the content that bloggers are posting about R. Over the past few months, 50 bloggers have come together in this place to share with all of us what they write about R. If you wish, you can see all of the articles they wrote in...

Read more »

Intelligent Enterprise: You Can Predict that R Will Succeed

March 3, 2010
By

Analyst David Stodder at Intelligent Enterprise also noted the activity around R at the recent Predictive Analytics World conference in San Francisco, and he reviews his impressions in a column today. In fact, he attributes the increasing prominence of predictive analytics to R: Possibly the most important factor influencing the spread of predictive analytics is the growing popularity of...

Read more »

Arrange multiple ggplot2 plots in the same image window

March 3, 2010
By

In a previous tutorial I showed you how to create plots faceted by the level of a third variable using ggplot2. A commenter asked about using faceted plots and viewports and reminded me of this function I found in the ggplot2 Google group. The arrange function below is similar to using par(mfrow=c(r,c)) in base graphics to put more than...

Read more »

Augmented support for complex survey designs in R

March 3, 2010
By
Augmented support for complex survey designs in R

We'll get back to code examples later this week, but wanted to let you know about an R package with updated functionality in the meantime.The appropriate analysis of sample surveys requires incorporation of complex design features, including stratification, clustering, weights, and finite population correction. These can be address in SAS and R for many common models. Section...

Read more »

Analyzing Google’s Winter Olympics Search Traffic with R

March 2, 2010
By
Analyzing Google’s Winter Olympics Search Traffic with R

The Official Google Blog today includes an analysis of Google's search traffic related to the recently-concluded Winter Olympics, correlating various high-profile events with searches from particular countries. For example, traffic from the United States shows the expected diurnal cycle but with promintent peaks for the opening ceremony and the hockey matches featuring the USA team: It's not specifically stated...

Read more »

MySQL alum Zack Urlocker join’s REvolution’s board

March 2, 2010
By

As you might have heard from this morning's press release, we've just welcomed a new member to REvolution's board of directors: Zack Urlocker. Zack has an impeccable open-source pedigree: until recently, he was responsible for engineering and marketing at MySQL, the wildly successful open-source database company recently acquired by Oracle (via its acquisition of Sun). Zack is also a...

Read more »

ACM Data Mining Camp, March 20

March 2, 2010
By

Following last year's successful unconference on data mining, the Bay Area Association for Computing Machinery (ACM) will again host the 2010 ACM Data Mining Camp on March 20 in San Jose, CA. The event is free and runs from 11:15am - 7:30pm, with an optional 2-hour pre-camp training in the morning. (REvolution Computing is a proud sponsor of this...

Read more »

The Economist reports on the information explosion

March 1, 2010
By

The current edition of The Economist includes a "special report on managing information", targeting the issue of the information explosion / data deluge / whatever you want to call it these days. It includes the usual attributes of the problem: data is being collected faster than we can store it, astronomers are creating petabytes of data daily, the usual....

Read more »

REvolution Computing hiring parallel computing developer

March 1, 2010
By

We're looking for a programmer with experience in high-performance computing and the R system to work on the ParallelR suite and other data-analysis projects. Sound like anyone you know? Check out the details at the link below. REvolution Computing careers: Parallel Computing Developer

Read more »

Example 7.24: Sampling from a pathological distribution

March 1, 2010
By
Example 7.24:  Sampling from a pathological distribution

Evans and Rosenthal consider ways to sample from a distribution with density given by:f(y) = c e^(-y^4)(1+|y|)^3where c is a normalizing constant and y is defined on the whole real line.Use of the probability integral transform (section 1.10.8) is not feasible in this setting, given the complexity of inverting the cumulative density function.The Metropolis--Hastings algorithm is a Markov...

Read more »