One of the things that normally slow me down when I am learning a new tool outside working hours is the lack of an interesting project/task that forces me to investigate more about the sort of activities required to finish the project successfully. On ...
R, like all good programming languages, treats functions as first class objects. Users can create functions, pass them as arguments, and have them returned as the result of other computations. You may be familiar with passing functions as arguments if you have used the apply family of functions (i.e. apply, sapply, lapply, mapply). For example, to get get...
I have designed and developed Automated Trading Systems (ATS) for few years now. Since trading live, I have been fairly profitable (that is, I achieved my goals). However, I had the unsatisfactory feeling that I was missing some information to increase the level of trust in my systems … I was missing the proper tools 
Got for 2010 Xmas a very cool book called the "4 Hour Body"(thanks Jose Santos) written by Tim Ferriss who write a previous favorite of mine about productivity, the 4 hour work week. Its an interesting book, because it has a scientific approach, it ...
This is a short example of using duck typing in a guard statement in the futile.paradigm. We are implementing a …
"It ain't easy being green. ~ Kermit T. F. Matt Blackwell at the SSSB has made it easy to access all the Craylola(tm) colors in R.And in case you're not familiar with the way R handles color, here are a few resources:* The best color chart for R.* Colo...
![Latent Gaussian Models in Zürich [day 1]](http://www.r-bloggers.com/wp-content/uploads/2011/02/img_7959.jpg?w=315&h=420)
An interesting first day (for me) at the Latent Gaussian Models workshop in Zürich. The workshop is obviously centred at the INLA approach, with Havard Rue giving a short course on Wednesday then a wide ranging tour of the applications and extensions of INLA this afternoon. Thanks to his efforts in making the method completely 
I read this post today by John Quick. I was a little taken back when he used a pairwise t-test for post hoc analysis. In a contradiction the t-test did not show differences in the treatment means when the ANOVA model did. This is because the pairwise.t.test does not take into account the two-way anova,
"The R-Files" is an occasional series from Revolution Analytics, where we profile prominent members of the R Community. Name: Dirk Eddelbuettel Background: Ph.D. (EHESS, France), Quantitative Analyst Nationality: Canadian Years Using R: About 15 Known for: RQuantlib, Rcpp/RInside, R packaging for Debian/Ubuntu, Task Views for Finance and HPC, CRANberries Dirk Eddelbuettel is an active member of the R community...
In a previous post, I showed the Lower Stratospheric Temperature Anomaly (TLS) Trends (link). A reader submitted the following comment: “The lower stratosphere temperature profile is essentially flat from ca. 1995 to the present. This approximately mirrors the temperature trend … Continue reading →
Zero Inflated Models and Generalized Linear Mixed Models with R.
Zuur, Saveliev, Ieno (2012).
