Using bootMer to do model comparison in R

July 13, 2014
By
Using bootMer to do model comparison in R

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

Read more »

The Zebra Of Riemann

July 13, 2014
By
The Zebra Of Riemann

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...

Read more »

RcppArmadillo 0.4.320.0

July 12, 2014
By

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. ...

Read more »

odfweave setup and counting logicals

July 12, 2014
By

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...

Read more »

R Notes: vectors

July 12, 2014
By

  R is different from C family languages. It has a C syntax, but a Lisp semantics. Programmers...

Read more »

Le Monde puzzle [#875]

July 11, 2014
By
Le Monde puzzle [#875]

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...

Read more »

Sometimes I feel (some) need for speed

July 11, 2014
By
Sometimes I feel (some) need for speed

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...

Read more »

IEEE ranks R #9 amongst all languages

July 11, 2014
By
IEEE ranks R #9 amongst all languages

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...

Read more »

Bayesian Wizardry for Muggles

July 11, 2014
By

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...

Read more »

ABC in Cancún

July 10, 2014
By
ABC in Cancún

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...

Read more »

Item Response Theory and Item Information Exploration

July 10, 2014
By
Item Response Theory and Item Information Exploration

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...

Read more »

R 3.1.1 is released (and how to quickly update it on Windows OS)

July 10, 2014
By
R 3.1.1 is released (and how to quickly update it on Windows OS)

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...

Read more »

R 3.1.1 is released

July 10, 2014
By

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,...

Read more »

Mathematical functions on non-numbers?!

July 10, 2014
By
Mathematical functions on non-numbers?!

A question came up about regarding Q1.4.9 in Cherney, Denton, Waldron. Here is a snippet of the original question: Consider …Continue reading →

Read more »

How Much Can We Learn from Top Rankings using Nonnegative Matrix Factorization?

July 10, 2014
By
How Much Can We Learn from Top Rankings using Nonnegative Matrix Factorization?

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...

Read more »

Syrian Refugee Density in Lebanon

July 10, 2014
By
Syrian Refugee Density in Lebanon

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...

Read more »

Tips & Tricks 4: Reading In Data Files

July 10, 2014
By

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...

Read more »

Reflections on John Chambers’ UserR! 2014 Keynote Address

July 10, 2014
By
Reflections on John Chambers’ UserR! 2014 Keynote Address

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....

Read more »

Including GitHub and Bioconductor on Rdocumentation: Technical Details

July 10, 2014
By
Including GitHub and Bioconductor on Rdocumentation: Technical Details

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...

Read more »

In case you missed it: June 2014 Roundup

July 9, 2014
By

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...

Read more »

FRAMA Part IV: Continuing the Long/Short Filter Search

July 9, 2014
By
FRAMA Part IV: Continuing the Long/Short Filter Search

This post examines an n-day median filter for two desirable properties: robustness to outliers and an inherent trend-confirming lag. While … Continue reading →

Read more »

Buster – a new R package for bagging hierarchical clustering

July 9, 2014
By
Buster – a new R package for bagging hierarchical clustering

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...

Read more »

Recording of OpenCPU talk at #useR2014

July 9, 2014
By
Recording of OpenCPU talk at #useR2014

A recording of the useR! 2014 prentation about OpenCPU is now available on Youtube. This talk gives a brief (20 minute) motivation and...

Read more »

Can Rcpp fuse ?

July 8, 2014
By
Can Rcpp fuse ?

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...

Read more »

Are Consumer Preferences Deep or Shallow?

July 8, 2014
By
Are Consumer Preferences Deep or Shallow?

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...

Read more »

Speed Tests for Rolling/Running Functions

July 8, 2014
By

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...

Read more »

R Day at Strata NYC

July 8, 2014
By
R Day at Strata NYC

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...

Read more »

DSC 2014, Day 2

July 8, 2014
By
DSC 2014, Day 2

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...

Read more »

Dependencies of popular R packages

July 8, 2014
By
Dependencies of popular R packages

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...

Read more »