Setting the right random effect part in mixed effect models can be tricky in many applied situation. I will not talk here about choosing wether a grouping variable (sites, individuals …) should be included as a fixed term or as a random term, please see Gelman and Hill (2006) and Zuur et al (2009) for 
Mathematics is the art of giving the same name to different things (Henri Poincare) Many surveys among experts point that demonstration of the Riemann Hypothesis is the most important pending mathematical...
While I was out at the (immensely impressive and equally enjoyable) useR! 2014 conference at UCLA, Conrad provided a bug-fix release 4.320 of Armadillo, the nifty templated C++ library for linear algebra. ...
Two short items in this blogpost. Since it was not obvious how to run odfWeave() in my particular setup, the call I am using. Then there were several people...
R is different from C family languages. It has a C syntax, but a Lisp semantics. Programmers...
I learned something in R today thanks to Le Monde mathematical puzzle: A two-player game consists in A picking a number n between 1 and 10 and B and...
I’m the first to acknowledge that most of my code could run faster. The truth of the matter is that, in essence, I write ‘quickies’: code that will run...
IEEE — the world's largest professional association for the language of technology — recently published its ranking of the popularity of programming languages. The R language comes in at...
Monday, I will be giving the closing talk of the R in Insurance Conference, in London, on Bayesian Computations for Actuaries, as to be more specific, Getting into Bayesian...
Here are our slides for the ABC short course Jean-Michel and I give at ISBA 2014 in Cancún next Monday (if your browser can manage Slideshare…) Although I...
In the following post I will map out some item information functions for item response theory (IRT) models using the common 3 parameter logistic model for binary responses. The...
R 3.1.1 (codename “Sock it to Me“) was released today! You can get the latest binaries version from here. (or the .tar.gz source code from here). The full list of new features and bug...
As announced by Peter Dalgaard for the R Core Team today, R 3.1.1 has been released. Codenamed "Sock it to Me", this is a patch release for R 3.1,...
A question came up about regarding Q1.4.9 in Cherney, Denton, Waldron. Here is a snippet of the original question: Consider …Continue reading →
Purchases are choices from available alternatives. Post-purchase, we know what is the most preferred, but all the other options score the same. Regardless of differences in appeal, all the...
I've done a few posts on Syria and have used data provided by the UNHCR for different analysis or visualization. There are several links on their Syrian refugee data portal that...
Today's exercise is another nice and simple one, and allows you to get used to manipulating datasets in R.Exercise 4 - How to read a file of coordinate data...
by Joseph Rickert John Chambers opened UseR! 2014 by describing how the R language grew out of early efforts to give statisticians easier access to high quality statistical software....
In our last blog post we announced the addition of GitHub and Bioconductor R packages to Rdocumentation. For the more technical amongst you, I’ll give a short, high-level description...
In case you missed them, here are some articles from June of particular interest to R users: The useR! 2014 conference in Los Angeles opened with 16 tutorials. DataInformed...
This post examines an n-day median filter for two desirable properties: robustness to outliers and an inherent trend-confirming lag. While … Continue reading →
I recently found myself a bit stuck. I needed to cluster some data. The distances between the data points were not representable in Euclidean space so I had to...
A recording of the useR! 2014 prentation about OpenCPU is now available on Youtube. This talk gives a brief (20 minute) motivation and...
One of the features of Rcpp11 people seemed to like during useR is the fuse function. fuse is somewhat similar to the c function in R. For the purpose...
John Hauser, because no one questions his expertise, is an excellent spokesperson for the viewpoint that consumer preferences are real, as presented in his article "Self-Reflection and Articulated Consumer...
I use rolling and running functions almost daily with financial time series. In my post A Whole New World with Chains and Pipes, I made this statement I have...
RStudio will teach the new essentials for doing data science in R at this year’s Strata NYC conference, Oct 15 2014. R Day at Strata is a full day...
This will be somewhat shorter summary of the second day of DSC 2014. There was a wider variety of presentations today, but I am only going to discuss those...
With the growing popularity of R, there is an associated increase in the popularity of online forums to ask questions. One of the most popular sites is StackOverflow, where...
Plotly: collaborative, publication-quality graphing.
