In case you missed them, here are some articles from February of particular interest to R users. How to resample from a large data set with RHadoop, and a video introduction to the RHadoop packages. A 90-second video explains: What is Revolution R Enterprise?  Jeffrey Stanton has published a free e-book "An Introduction to Data Science" using R. I participated in a Google Hangout to discuss predictive analytics, Hadoop and R. Recent media articles (including Forbes and InformationWeek) with mention of R and Revolution Analytics.  Quandl, a source for free time series data, is introduced by its founder. An R package for Quandl is available.  I gave a presentation at the Strata conference on real-time predictive analytics on big data with R. The PitchRx package generates animations of baseball data.  Three ways of connecting Hadoop and R.  The yhat blog lists 10 R packages that everyone should know about. Joseph Rickert's "Data Mining with R" presentation, slides and R code. How to make a Valentine's Day heart with polar functions and R. A book review of Winston Chang's "R Graphics Cookbook".  Why you shouldn't use Excel to build complex correlation models, and how it was involved in the downfall of the London Whale.  Follow @StackOverflowR on Twitter to be informed of new R questions on StackOverflow. How to analyze web traffic data from Google Analytics with R. The devtools package makes the process of building R packages easier. New ways of visualizing networks and graphs with R: arc diagrams and hive plots. Carlos Scheidegger and Kenny Shirley used R to design an interactive visualization of Baseball Hall of Fame votes over the past 80 years. Some non-R stories in the past month included: Juggling quadrocopters, Russian meteor videos, a talking piano, Forrester's emerging technologies for Big Data and a geographic jigsaw puzzle based on the Mercator projection. As always, thanks for the comments and please send any suggestions to me at david@revolutionanalytics.com . Don't forget you can follow the blog using an RSS reader like Google Reader, or by following me on Twitter (I'm @revodavid). You can find roundups of previous months here.