Note: This post is NOT financial advice! This is just a fun way to explore some of the capabilities R has for importing and manipulating data. I recently read a post on ETF Prophet that explored an interesting stock trading strategy in Ex...
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Getting data from the Infochimps Geo API in R
I am very intrigued by the Infochimps Geo API, so wanted to play around with it a little bit and pull the data into R. I’ll start by getting data from the American Community Survey Topline API for a 10km area around where I live. First some setup code here. It imports a couple libraries 
Revolution Newsletter: September 2011
The most recent edition of the Revolution Newsletter is out. The news section is below, and you read the full September edition (with highlights from this blog and community events) online. You can subscribe to the Revolution Newsletter to get it monthly via email. Using Revolution R with Hadoop: Revolution Analytics has released three open-source R packages, making it...
R is a cool sound editor!
Capabilities of R are definitely unless! After my previous posts about some easy image editing in R (they are here, and here), now is the time to explore if R is capable of sound editing!
Just for fun, here I created a function that receives a phone number (or another sequence of numbers), and returns the equivalent melody...
Webinar: Leveraging R in Hadoop Environments
On Wednesday September 21, Revolution Analytics' CTO David Champagne will give a live webinar introducing three new open-source packages for R and Hadoop, which make it possible to work with Hadoop data in R, and bring in-database R analytics to Hadoop. Here are the details: Date: Wednesday, September 21st Time: 10:00AM - 10:30AM Pacific Time Presenter: David Champagne, Chief...
Review of “Risk and Meaning” by Nicolas Bouleau
The subtitle is: Adversaries in Art, Science and Philosophy. Executive Summary Genius or madness? I haven’t decided. Irreversibility of interpretation The book drives home that once we decide how something is we can’t go back to our state of innocence. Figures 1 through 3 exhibit this idea via a randomly generated polygon. Look at Figure … Continue reading...
An example of ROC curves plotting with ROCR
Decided to start githib with ROC curve plotting example. There is not a one ROC curve but several - according to the number of comparisons (classifications), also legend with maximal and minimal ROC AUC are added to the plot. ROC curves and ROC AU...
rmongodb – R Driver for MongoDB
The source code to rmongodb (home page at http://cnub.org/rmongodb.ashx), a driver to MongoDB for the R language, has been released as open source at GitHub: https://github.com/gerald-lindsly/rmongodb. This portable full-featured package was developed on top of the mongodb.org supported C driver. It runs almost entirely in native code so you can expect high performance. Plans are to submit rmongodb to CRAN soon for pre-built binary distribution, but first I would...
Fix missing dates with R
I have data on user access to a website. This log file (helpdesk log.csv) just contains the date of access, and how many accesses were counted. It would look like this:Date hits13-07-2011 214-07-2011 116-07-2011 317-07-2011 4...As you can see, for day...
Le Monde puzzle [#738]
![Le Monde puzzle [#738]](http://feeds.wordpress.com/1.0/comments/xianblog.wordpress.com/11990/)
The Friday puzzle in Le Monde this week is about “friendly perfect squares”, namely perfect squares x2>10 and y2>10 with the same number of digits and such that, when drifting all digits of x2 by the same value a (modulo 10), one recovers y2. For instance, 121 is “friend” with 676. Here is my R 
Zero Inflated Models and Generalized Linear Mixed Models with R.
Zuur, Saveliev, Ieno (2012).
