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Well, so much for that #march11 #Saudi day of rage.  Whether it was really the "tempest in a teacup" that  Prince Al-Waleed suggested on CNBC (video below, transcript here) or not, the oil complex and Saudi markets seem to have shrugged … Continue reading → [Read more...]

I don't like R to create a local directory tree in my home directory because new packages will automatically be installed into that directory. The way to do this is to modify the "/usr/local/lib64/R/etc/Renviron" and mark the line "R_LIBS_USER=${R_LIBS... [Read more...]

Last time, I covered ordinary least squares with a single variable. This time, I'll extend this to using multiple predictor variables in a regression, interacting terms in R, and start thinking about using polynomials of certain terms in the regression (like Age and Age Squared). This should be a pretty ... [Read more...]

Could any R expert here help me to vectorize my for loop? Thanks in advance for your favor. The reason I am in trouble is the variable inside my "for" function are updated after each loop, which makes me feel difficult to use lapply, sapply or whatever. Simplifed codes are ... [Read more...]

I’ve been using R for a couple of years now.  This post is aimed at me a couple of years ago, or you if you’re just starting to use R and are pressed for time.  Here’s some things I wish I’d known in early 2009. Use a ... [Read more...]

Conrad Sanderson continues an active release schedule for his wonderful Armadillo templated C++ library for linear algebra; release 1.1.8 just came out yesterday. So I made a new release 0.2.16 of RcppArmadillo, our Rcpp-based integration into R. No ... [Read more...]

According to respondents of the 2010 Rexer Analytics Data Miner Survey, open source R is the most commonly-used analysis tool amongst data miners: After a steady rise across the past few years, the open source data mining software R overtook other tools to become the tool used by more data miners (43%) ... [Read more...]

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I received requests for the script used during the tutorial.All the material is available in the main page of the course.However, in order to facilitate the availability of the scripts to all the viewers of this blog I've put the link to donwnload them... [Read more...]

I hope the code here is fairly self-explanatory with the inset annotations. I feel this is just a bit 'prettier' than heatmap.2 and has for me the right balance of options and extensibility. I have also found it difficult to produce high quality plots... [Read more...]

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Summary: Very useful for reference while producing graphs, and very comprehensive (including heat-maps, 3D graphs and maps). Reference: Mittal, H. V., 2011, R Graph Cookbook, Packt Publishing, Birmingham, UK, 272 pages,  Publisher’s Website As a scientist I often need to plot graphs of my data, so I am keen to learn ... [Read more...]

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This post from Sherry LaMonica is the first in a series from members of the Revolution Analytics Engineering team — ed. Do you know about the big data capabilities in the RevoScaleR package, included with every Revolution R Enterprise installation? RevoScaleR provides a framework for fast and efficient multi-core processing of ... [Read more...]

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(The image above is called a “Beeswarm Boxplot” , the code for producing this image is provided at the end of this post) The above plot is implemented under different names in different softwares. This “Scatter Dot Beeswarm Box Violin – plot” (in the lack of an agreed upon term) is a ... [Read more...]

R has factors, which are very cool (and somewhat analogous to labeled levels in Stata). Unfortunately, the factor list sticks around even if you remove some data such that no examples of a particular level still exist# Create some fake datax levels(x)x levels(x) # still the same levelstable(... [Read more...]