Now that the final submissions are in for the Applications of R in Business contest, it's time to announce the judging panel who will select the winners for $20,000 in cash prizes from Revolution Analytics. They are: Edd Dumbill, technologist and writer for O'Reilly Media David Menninger, VP & Research Director at Ventana Research Steve Miller, technology writer and...
Monthly Archives: December 2011
Displaying german stock performance with R using ggplot2
I cannot follow stock market developments daily, so I was looking for a quick overview of what had happened in the last week. What would be of interest for me is “How did German stocks perform over the last 5 days, compared to the last 20 trading days and the last 250 trading days”. R 
An example RNA-Seq Quality Control and Analysis Workflow
I found the slides below on the education page from Bioinformatics & Research Computing at the Whitehead Institute. The first set (PDF) gives an overview of the methods and software available for quality assessment of microarray and RNA-seq experim...
Visualization of Prosper.com’s Loan Data Part I of II – Compare and Contrast with Lending Club
Due to the positive feedback received on this post I thought I would re-create the analysis on another peer-to-peer lending dataset, courtesy of Prosper.com. You can access the Prosper Marketplace data via an API or by simply downloading XML files that are updated nightly http://www.prosper.com/tools/. If you are going to follow the route I took
Example 9.17: (much) better pairs plots
Pairs plots (section 5.1.17) are a useful way of displaying the pairwise relations between variables in a dataset. But the default display is unsatisfactory when the variables aren't all continuous. In this entry, we discuss ways to improve these dis...
RcppArmadillo 0.2.32
Conrad Sanderson made the official 2.4.0 release of Armadillo last evening. This was wrapped into RcppArmadillo release 0.2.32 which arrived on CRAN earlier today. The NEWS entries summarising the changes since the 2.2.* series, we already saw mos...
Multi-Asset Backtest : Rotational Trading Strategies
I want to discuss the implementation of Rotational Trading Strategies using the backtesting library in the Systematic Investor Toolbox.The Rotational Trading strategy switches investment allocations throughout the time, betting on few top ranked assets. For example, the ranking can be based on relative strength or momentum. A few examples of the Rotational Trading Strategies (or 
My Favorite Graphs
The important criterion for a graph is not simply how fast we can see a result; rather it is whether through the use of the graph we can see something that would have been harder to see otherwise or that could not have been seen at all. – William Cleveland, The Elements of Graphing Data, Related posts:
Using R — Standalone Scripts & Error Messages
Open-source R is an amazing tool for statistical analysis and data visualization. Serious R gurus have found ways to do just about anything entirely within the R environment. Nevertheless, there are many of us who wish to plug R into … ...
Loading OSU’s VGPM ocean productivity data in R
Oregon State University makes a set of ocean productivity data derived from satellite data available for download and use by researchers. The Ocean Productivity website explains the available data and how it was derived. I have put together a few R fun...
Zero Inflated Models and Generalized Linear Mixed Models with R.
Zuur, Saveliev, Ieno (2012).
