As promised by the R Core Group, R 2.14.2 is out. This is the final patchlevel of the R 2.14.x series (R 2.15.0 is due on March 30), and so R 2.14.2 will be the R engine for the next release of Revolution R Enterprise in a couple of months. Today also marks the...
Monthly Archives: February 2012
Massive Increase in Ethanol Production
Description:Yearly production of Ethanol in the United States since 1980.Data:http://www.ethanolrfa.org/Analysis:When it comes to fuel - especially for transportation - oil is king. In 2010, the United States imported 180.8 billion gallons of crude oil...
A Direct Marketing In-flight Forecasting System
This is an edited version of A Direct Marketing In-flight Forecasting System. The original article was written by Shannon Terry and Ben Ogorekm, Nationwide Insurrance, in order to enter the “Applications of R in Business” contest organised by Revolution Analytics. This is the winning entry of the contest. I added some notes in the...
Programatically rename files (or do other stuff to them) in R
In order to do something to a bunch of files at once, we first need a vector which contains the file paths of just the files we are interested in. startingDir<-"/myDirectory"filez<-list.files(startingDir,pattern="searchPattern")head(filez) "/m...
Functional ANOVA using INLA – update
INLA author Håvard Rue wrote me to point out a problem in the Functional ANOVA code given in this post. I made a mistake in setting the precision of the fixed effects (I used “default” instead of “prec”). I’ve put Håvard’s corrected version of the code below. 
Graphical message boxes with R package tcltk
Sometimes you just need a graphical messagebox....know what I mean? If only because it pops up in front of all the other open windows and alerts you to the fact that your R script is waiting for you to do something, or is finished doing something else....
ABC in Roma [R lab #1]
![ABC in Roma [R lab #1]](http://feeds.wordpress.com/1.0/comments/xianblog.wordpress.com/15032/)
Here are the R codes of the R labs organised by Serena Arima in supplement of my lectures. This is quite impressive and helpful to the students, as illustrated by the first example below (using the abc software). I am having a great time teaching this “ABC in Roma” course, in particular because of...
Statistics project ideas for students
Here are a few ideas that might make for interesting student projects at all levels (from high-school to graduate school). I’d welcome ideas/suggestions/additions to the list as well. All of these ideas depend on free or scraped data, which means tha...
XYZ geographic data interpolation, part 2
Having recently received a comment on a post regarding geographic xyz data interpolation, I decided to return to my original "xyz.map" function and open it up for easier interpretation. This should make the method easier to adapt and follow.T...
A minimum variance portfolio in 2011
2011 was a good vintage for minimum variance, at least among stocks in the S&P 500. Previously The post “Realized efficient frontiers” included, of course, a minimum variance portfolio. That portfolio seemed interesting enough to explore some more. “What does ‘passive investing’ really mean” suggests that minimum variance should be considered a form of...
Zero Inflated Models and Generalized Linear Mixed Models with R.
Zuur, Saveliev, Ieno (2012).
