In case you missed them, here are some articles from February of particular interest to R users: A statistical analysis of various forecasting methods (using R) leads to correct predictions for 21 of 24 Oscars awards. There are now 123 R User Groups worldwide, and applications for Revolution Analytics sponsorship grants are open until March 31. Revolution Analytics was...
Unit root tests and ARIMA models
An email I received today: I have a small problem. I have a time series called x : - If I use the default values of auto.arima(x), the best...
R AND OOP – defining new classes
My previous article shows an example in which data analysis requires a structured framework with R and OOP. In order to explain how to build the framework this article...
Web Scraping: working with APIs
APIs present researchers with a diverse set of data sources through a standardised access mechanism: send a pasted together HTTP request, receive JSON or XML in return. Today we...
OpenCPU 1.2.3 release
A new version of OpenCPU was released to CRAN and Launchpad. Besides some minor bugfixes, the single-user has better...
QuantLib 1.4 packages also available for Ubuntu and Windoze
QuantLib release 1.4 came out a couple of days ago. Sticking with standard practice, I immediately updated the Debian packages I have been maintaining for over a dozen years...
GSOC 2014: Let’s do it again!
Google Summer of Code opened for students on Monday, March 10, more than a month earlier than last year. If you weren’t following the announcements and that deadline caught...
A new series: R-fiddle of the Week
Now that our ‘Learning R’ -series is coming to an end (for those who missed it, have a look at our Twitter or Facebook ), it is time to...
where did the normalising constants go?! [part 2]
![where did the normalising constants go?! [part 2]](http://xianblog.files.wordpress.com/2012/03/pict0850.jpg?w=450&h=337)
Coming (swiftly and smoothly) back home after this wonderful and intense week in Banff, I hugged my loved ones, quickly unpacked, ran a washing machine, and then sat down...
Less wordy R
The Swarm Lab presents a nice comparison of R and Python code for a simple (read ‘one could do it in Excel’) problem. The example works, but I was...
Package rinat use case: map of iNaturalist project
iNaturalist projects are collection of records posted on iNatualist. Now that we have a R package rinat from rOpenSci I thought of playing around with the data. Here is...
Call for Presentations for the EARL Conference, London Sep 2014
Mango Solutions invite presentations for the EARL (Effective Applications of the R Language) Conference which will be held in London on the 16-17th September 2014. The EARL Conference provides...
SAS, SPSS, Stata Users: Learn R from Home April 21
Has learning R been driving you a bit crazy? If so, it may be that you’re “lost in translation.” On April 21 and 23, I’ll be teaching a webinar,...
googleVis code development moved to GitHub
After nearly 4 years of developing googleVis on Google Code with SVN we decided to move to GitHub. The main reason was that Google stopped the facility of hosting...
Capturing Intraday data
I want to follow up the Intraday data post with an example of how you can capture Intraday data without too much effort by recording 1 minute snapshots of...
where did the normalising constants go?! [part 1]
When listening this week to several talks in Banff handling large datasets or complex likelihoods by parallelisation, splitting the posterior as and handling each term of this product on...
R 3.0.3 is released
R 3.0.3 (codename “Warm Puppy) was released several days ago. The full list of new features and bug fixes is provided below. Upgrading to R 3.0.3 You can download...
Stan Model of the Week: PK Calculation of IV and Oral Dosing
We’re going to be starting a Stan “model of the P” (for some time period P) column, so I thought I’d kick things off with one of my own....
How effective is my research programming workflow? The Philip Test – Part 1
Philip Guo, who writes a wonderful blog on his views and experiences of academia – including a lot of interesting programming stuff – came up with a research programming version of...
Real-time Reporting with the Adobe Analytics API
Starting with version 1.3.1 of RSiteCatalyst, you can now access the real-time reporting capabilities of the Adobe Analytics API through a familiar R interface. Here’s how to get started… GetRealTimeConfiguration...
Writing a book with a little help from Emacs and friends
This post provides technical details about the making of my book “Displaying time series, spatial, and space-time data with R”, …Sigue leyendo →
Displaying time series, spatial, and space-time data with R is available for pre-order
Two years ago, motivated by a proposal from John Kimmel, Executive Editor at Chapman & Hall/CRC Press, I started working …Sigue leyendo →
Performance of Trend Factor in Chinese market
Han, Y.F., and Zhou, G.F. have an interesting working paper on the performance of a trend factor they proposed:QuotationIn this paper, we propose a trend factor to capture cross-section...
Using old versions of R packages
I received this email yesterday: I have been using your ‘forecast’ package for more than a year now. I was on R version 2.15 until last week, but I...
Intraday data
In the Intraday Backtest post I showed an example of loading and working with Forex Intraday data from the FXHISTORICALDATA.COM. Recently, I came across another interesting source of Intraday...
Gadka na SERze
These are slides from the very first SER meeting – an R user group in Warsaw – that took place on February 27, 2014. I talked about various “lifehacking”...
Dora’s Choice
Arithmetic is being able to count up to twenty without taking off your shoes (Mickey Mouse) On her last mission, Dora The Explorer sails down the Amazon river to...
A question of model uncertainty
It has been several months since my last post on classification tree models, because two things have been consuming all of my spare time. The first is that I...
Bay Area RUG Talk on 3/17
I'm making my yearly pilgrimage to San Fransico to teach at PAW.I'll also be giving a short talk at the Bay Area R Users Group on model tags...
Plotly: collaborative, publication-quality graphing. 
