November 2013

Try out R online with R-Fiddle

November 25, 2013 | David Smith

It's pretty easy (and free!) to download R and install it on your own PC, Mac or Linux machine, but if you don't have one of those or simply aren't ready to commit to installing it, you can now try it out online. R-Fiddle (from DataMind) provides an easy-to-use interactive ... [Read more...]

Getting Started with Mixed Effect Models in R

November 25, 2013 | Jared Knowles

Getting Started with Multilevel Modeling in R Getting Started with Multilevel Modeling in R Jared E. Knowles Introduction Analysts dealing with grouped data and complex hierarchical structures in their data ranging from measurements nested within participants, to counties nested within states or students nested within classrooms often find themselves in ... [Read more...]

Generating Ticker Symbols with Markov Chains

November 25, 2013 | Ryan Walker

Stock ticker symbols are short character string codes (AAPL for Apple, WMT for Walmart) that uniquely identify stock listings. They originate from the days when stock quotes were transmitted via telegraph. These symbols are often used as tools for branding and companies choose them to be memorable and easily recognized. ... [Read more...]

Mapping Foodborne Chicago Reports

November 25, 2013 | Cory Nissen

I help out with a project called Foodborne Chicago, where we search twitter for people in Chicago mentioning "food poisoning" and @reply to them with a link where they can file a report with the city of Chicago's Department of Public Health. The applic...
[Read more...]

Ranked Choice Voting

November 25, 2013 | Andy

The city of Minneapolis recently elected a new mayor. This is not newsworthy in and of itself, however the method they used was—ranked choice voting. Ranked choice voting is a method of voting allowing voters to rank multiple candidates in order of preference. In … Continue reading → [Read more...]

R now has its own shelf in Dillons

November 24, 2013 | Derek Jones

I was in Dillons, the one opposite University College London, at the start of the week and what did I spy there? There is now a bookshelf devoted to R (right, second from top) in the programming languages section. The shelf would be a lot fuller if O’Reilly did ... [Read more...]

Buffon needled R exams

November 24, 2013 | xi'an

Here are two exercises I wrote for my R mid-term exam in Paris-Dauphine around Buffon’s needle problem. In the end, the problems sounded too long and too hard for my 3rd year students so I opted for softer questions. So recycle those if you wish (but do not ask ... [Read more...]

Website and blog updated

November 24, 2013 | Thinking inside the box

Earlier this year the blog had its tenth anniversary. I had meant to celebrate the occassion by revamping the site and blog a little. Having set up the updated R/Finance site, the Rcpp Gallery and Rcpp sites as well as the much-needed overhaul of th... [Read more...]

Just for fun: attractors in R

November 24, 2013 | Pete

I have a borderline unhealthy obsession with attractors. I thought I got it out of my system, but here we are. For whatever reason, I felt like making some in R.You can find the R code here. It uses the attractor function to define density in a ma... [Read more...]

Dutch Rainwater Composition 1992-2011

November 24, 2013 | Wingfeet

Last week I examined rainwater composition 1992 to 2005. There is additional data, but National Institute for Public Health has changed equipment in 2005. This week I will add those data.DataData is in a number of spreadsheets. The scrip... [Read more...]

Implementing a Queue as a Reference Class

November 24, 2013 | andrew

I am working on a simulation for an Automatic Repeat-reQuest (ARQ) algorithm. After trying various options, I concluded that I would need an implementation of a queue to make this problem tractable. R does not have a native queue data structure, so this seemed like a good opportunity to implement ... [Read more...]

Bayesian Linear Regression Analysis (with non-informative priors but without Monte Carlo) In R

November 24, 2013 | Christos Argyropoulos

Continuing the previous post concerning linear regression analysis with non-informative priors in R, I will show how to derive numerical summaries for the regression parameters without Monte Carlo integration. The theoretical background for this post is contained in Chapter 14 of Bayesian Data Analysis which should be consulted for more information. ... [Read more...]

Reproducible Reporting Example

November 23, 2013 | dogle

I began playing with the screenr software this evening and my first attempt was to create a short video that demonstrates reproducible report writing in RStudio using knitr and LaTeX.  You can see the example at my screenr page (hit Play … Continue reading → [Read more...]

Simulation speed: GNU R vs Julia

November 23, 2013 | Bogumił Kamiński

Recently there is a lot of noise about Julia. I have decided to test its speed in simulation tasks on my toy Cont model. I thought I had vectorized my GNU R code pretty well, but Julia is much faster.The model was described in my earlier posts so let ... [Read more...]

Simulatin speed: GNU R vs Julia

November 22, 2013 | Bogumił Kamiński

Recently there is a lot of noise about Julia. I have decided to test its speed in simulation tasks on my toy Cont model. I thought I had vectorized my GNU R code pretty well, but Julia is much faster.The model was described in my earlier posts so let ... [Read more...]
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