February 2015

Launching DataScience.Vegas Blog

February 23, 2015 | Daniel Emaasit

We are glad to announce the launch of DataScience.Vegas as a blog that aggregates all the events, news and information impacting the Las Vegas data science community. Our community has witnessed the birth and steady growth of several data science meetup groups with a very enthusiastic group of devoted ... [Read more...]

Masters of Spin: Unraveling the web with R

February 23, 2015 | Tinniam V Ganesh

Here is a look at some of the masters of spin bowling in cricket. Specifically this post analyzes 3 giants of spin bowling in recent times, namely Shane Warne of Australia, Muthiah Muralitharan of Sri Lanka and our very own Anil Kumble of India.  As to “who is the best leggie” ...
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Hadoop and Neo4j

February 23, 2015 | Yanchang Zhao

Hadoop is being widely used for processing big data and Neo4j is a popular open-source graph database. When doing social network analysis on big data, a “natural” thought is to use them together. Unfortunately, Neo4j cannot work directly on HDFS … Continue reading → [Read more...]

drat Tutorial: Publishing a package

February 22, 2015 | Thinking inside the box

Introduction The drat package was released earlier this month, and described in a first blog post. I received some helpful feedback about what works and what doesn't. For example, Jenny Bryan pointed out that I was not making a clear enough distinction between the role of using drat to publish ... [Read more...]

k-means clustering and Voronoi sets

February 22, 2015 | arthur charpentier

In the context of -means, we want to partition the space of our observations into  classes. each observation belongs to the cluster with the nearest mean. Here “nearest” is in the sense of some norm, usually the (Euclidean) norm. Consider the case where we have 2 classes. The means being respectively ... [Read more...]

Priors on odds and probability of success

February 22, 2015 | Wingfeet

In Bayesian Approaches to Clinical Trials and Health-Care Evaluation (David J. Spiegelhalter, Keith R. Abrams, Jonathan P. Myles) they mention that an non informative prior should be uniform over the range of interest. They combine this with the d... [Read more...]

Visualizing Hubway Trips in Boston

February 21, 2015 | Benevolent Planner

Most Popular Hubway Stations (in order): Post Office Sq. – located in the heart of the financial district. Charles St. & Cambridge – the first Hubway stop after crossing from Cambridge over Longfellow Bridge. Tremont St & West – East side of the Boston Common South Station Cross St. & Hannover – entrance to North End combing ... [Read more...]

Export R output to a file

February 21, 2015 | Bruno Rodrigues

Sometimes it is useful to export the output of a long-running R command. For example, you might want to run a time consuming regression just before leaving work on Friday night, but would like to get the output saved inside your Dropbox folder to take a look at the results ... [Read more...]

Continuous Integration for R packages

February 21, 2015 | gluc

What is git? Git is a version control system, and the best I have worked with for that matter. 15 years ago, I was happy when my company decided to migrate from RCS to SVN. Branching became simple, and many daily problems just disappeared. So I shuned other source control versioning ... [Read more...]

RcppAPT 0.0.1

February 21, 2015 | Thinking inside the box

Over the last few days I put together a new package RcppAPT which interfaces the C++ library behind the awesome apt, apt-get, apt-cache, ... commands and their GUI-based brethren. The package currently implements two functions which permit search for package information via a regular expression, as well as a (vectorised) package ... [Read more...]

HOW TO: Package vignettes in plain LaTeX

February 20, 2015 | Henrik Bengtsson

Ever wanted to include a plain-LaTeX vignette in your package and have it compiled into a PDF? The R.rsp package provides a four-line solution for this. But, first, what's R.rsp? R.rsp is an R package that implements a compiler for the RSP markup language. RSP can be ... [Read more...]

Making Maps in R with Ryan Peek and Michele Tobias

February 20, 2015 | Noam Ross

Today, Ryan Peek and Michele Tobias gave an introduction to making maps in R. Here’s the webcast: (Pardon the little scuffle at the beginning and as we switched computers halfway through. Still getting the hang of hangouts.) Resources: Download all of Ryan’s code and HTML files here. See ... [Read more...]

The United States In Two Words

February 20, 2015 | aschinchon

Sweet home Alabama, Where the skies are so blue; Sweet home Alabama, Lord, I’m coming home to you (Sweet home Alabama, Lynyrd Skynyrd) This is the second post I write to show the abilities of twitteR package and also the second post I write for KDnuggets. In this case ...
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Part 2: Data Preparation

February 20, 2015 | Pedro M.

In Part 1 I have introduced the weather data set we will be using in this series of tutorials. We are now going to have the data prepared for the subsequent EDA. We will recode and transform variables, change their types, and perform some basic data ch... [Read more...]
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