After a few months of testing we present OpenCPU versions 1.3 and 1.4. These releases do not introduce any major changes in the OpenCPU HTTP API but focus entirely on performance, reliability and security to support long running servers. The on...
Testing for Linear Separability with Linear Programming in R
For the previous article I needed a quick way to figure out if two sets of points are linearly separable. But for crying out loud I could not find a...
Play 2048… using R!
I've lost about 100 hours over the past week to the black hole of 2048. In an attempt to...
The Current Golden Era of the NBA
We are in the midst of what many are calling a "golden age" of the NBA. Being in the midst of a time where attention to the sport has...
Old tails: a crude power law fit on ebook sales
We use R to take a very brief look at the distribution of e-book sales on Amazon.com. Recently Hugh Howey shared some eBook sales data spidered from Amazon.com: The...
R and the weather in the local news
The Mountain View Voice is a weekly newspaper serving the Silicon Valley area, and is a familiar sight to anyone wandering the streets of Palo Alto or Menlo Park....
DM Radio on Data Science
A couple of weeks ago, I participated in a panel discussion for DM Radio: "Still Sexy? How's that Data Scientist Gig Working Out?". The title was provocative, but the...
My talks @ Universitat de Girona
Just after Easter, I'll go for a very quick trip to lovely Girona, where Marc Saez has invited me to give two talks.The first one will be a re-run...
Date formating in R
As I often manipulate time series from different sources, I rarely come across the same date format twice. Having to reformat the dates every time is a real waste...
Reot: Empirical Orthogonal Teleconnections in R
We are happy to introduce Reot, an R package designed for empirical orthogonal teleconnection (EOT) analysis of gridded geo-scientific space-time data based on the method by van den Dool...
Using Gitbook with R Markdown
Gitbook has been getting some (deserved) attention. For those who haven’t seen it, Gitbook is a system to create really beautiful interactive web (or PDF and ebook) books....
Publishing in GitHub
Publishing in GitHub Publishing in GitHubI struggled to make my first repository in GitHub. I finally found out the steps to...
Database for chronic malignancies
Dear all, recently I have designed a database for Multiple Myeloma, which can easily be extended to include other malignancies and chronic diseases.The database and its guide can be...
Physignal Input is 3D Array Only
Geomorph users,The function physignal() in version 2.0 has a mistake in the manual regarding the input matrix: only 3D array can be used at this time. The next version will have...
Diving into H2O
by Joseph Rickert One of the remarkable features of the R language is its adaptability. Motivated by R’s popularity and helped by R’s expressive power and transparency developers working...
dplyr Example #1
Hadley Wickam released the dplyr package in January 2014. Since then I have been itching to give it a try as it has been suggested to speed up some...
R Interface to Myfxbook
Myfxbook provides an interface to your FOREX trading accounts as well as an active trading community. It has a broad range of functionality including a responsive interface to the...
Make your ggplots shareable, collaborative, and with D3
Editor's note: This is a guest post from Matt Sundquist form the Plot.ly team.You can access the source code for this post at https://gist.github.com/sckott/10991885Ggplotly and
How Fast the Fastest Human Would Run 100m?
Ethan Siegel wrote a post entitled The Math of the Fastest Human Alive five years ago, using regressions. An alternative is too use extreme value models (I wrote a post a...
Bitsanity
BitsanityThe awesome folks at Quandl (an amazing data collection and distribution service) have been so kind as to allow me to write for their blog.In my first post for...
Why writing vectorized code in R is a good idea
As a language for statistical computing, R has always had a bias towards linear algebra, and is optimized for operations dealing in complete vectors and matrixes. This can be...
Using R — Working with Geospatial Data (and ggplot2)
This is a follow-up blog-post to an earlier introductory post by Steven Brey: Using R: Working with Geospatial Data. In this post, we’ll learn how to plot geospatial data in...
Modeling Data With Functional Programming In R – Chapter 1
I’m pleased to announce that a rewrite of my first chapter of “Modeling Data With Functional Programming In R” is …Continue reading →
Vectorization in R: Why?
Here are my notes from a recent talk I gave on vectorization at a Davis R Users’ Group meeting. Thanks to Vince Buffalo, John...
Geomorph 3D Visualization
Dear geomorph users,version 2.0 of geomorph brings new developments in how shape deformations from 3D coordinate shape data can be viewed. We have implemented warping of 3D surface files...
Geomorph Version 2.0 Now Available!
Geomorph users,We have uploaded version 2.0 to CRAN. The windows and mac binaries have been compiled and the tarball is available.Version 2.0 comes with substantial changes and new features: New function...
R Courses in Milan (Italy): May 2014
Dear R users, the May 2014 public training course schedule for Milano (Italy) based courses is as follows: Web Applications with R and Shiny May 15, 2014 Reports in...
Errors on percentage errors
The MAPE (mean absolute percentage error) is a popular measure for forecast accuracy and is defined as where denotes an observation and denotes its forecast, and the...
Checking (G)LM model assumptions in R
(Generalized) Linear models make some strong assumptions concerning the data structure: Independance of each data points Correct distribution of the residuals Correct specification of the variance structure Linear relationship...
Plotly: collaborative, publication-quality graphing. 
