Here is a short intro R talk I gave today...for what it's worth...R Introduction View more presentations from schamber
Monthly Archives: September 2011
Looking to hire data scientists
We are a global management consulting firm and are looking for data scientists in our team in New York/Washington DC and Gurgaon/Chennai (India). There are full-time and internship (New York) opportunities. There are multiple positions i...
Le Monde puzzle [#739]
![Le Monde puzzle [#739]](http://xianblog.files.wordpress.com/2011/09/lemonde739-e1315153639188.jpg?w=378&h=349)
The weekend puzzle in Le Monde this week is again about a clock. Now, the clock has one hand and x ticks where a lamp is either on or off. The hand moves from tick to tick and each time the lights go on or off depending on whether or not both neighbours were in 
I’m Starting a New Position at the University of Virginia
I just accepted an offer for a faculty position at the University of Virginia in the Center for Public Health Genomics / Department of Public Health Sciences. Starting in October I will be developing and directing a new centralized bioinformatics core ...
Faster (recursive) function calls: Another quick Rcpp case study
There was another question recently on StackOverflow that I had meant to discuss in a follow-up post here. User deltanovember asked about slow recursive functions and used the very classic Fibonacci number as an example. To recap, Fibonacci number a...
The effectiveness of links shared on Facebook, Twitter, and YouTube
The bitly blog has posted a really interesting analysis of the effectiveness of links shared via the social-media services Facebook, Twitter and YouTube. Here, effectiveness is measured by the "half-life" of a link: the amount of time it takes for that link to generate half the clicks it will ever attract. They summarize their results in this ggplot2 density...
In case you missed it: August Roundup
In case you missed them, here are some articles from August of particular interest to R users. A contest to showcase applications of R for businesses is offering $20,000 in prizes from Revolution Analytics. Three new open-source packages integrating R and Hadoop will be introduced by Revolution Analytics' CTO David Champagne in a webinar on September 21. Dirk Eddelbuettel...
Interacting with bioinformatics webservers using R
In an ideal world, all bioinformatics tools would be made available via the Web as a web service with an API, as well as a standalone package to download for local use. This is rarely the case and sometimes, even where one or the other is available, factors such as cost come into play. So 
A brief history of S&P 500 beta
Data The data are daily returns starting at the beginning of 2007. There are 477 stocks for which there is full and seemingly reliable data. Estimation The betas are all estimated on one year of data. The times that identify the betas mark the point at which the estimate would become available. So the betas … Continue reading...
Multiple plots with subplot in R
I'm in the middle of creating a poster and wanted to compresss the content by transforming some of the charts into subplots of other charts.
I made a little survey and found that there is a TeachingDemos library in CRAN that fits my needs. Well, the parameterization of the functions is a bit tricky but after a few tries...
Zero Inflated Models and Generalized Linear Mixed Models with R.
Zuur, Saveliev, Ieno (2012).
