April 2015

A simple explanation of rejection sampling in R

April 22, 2015 | Florian Hartig

The central quantity in Bayesian inference, the posterior, can usually not be calculated analytically, but needs to be estimated by numerical integration, which is typically done with a Monte-Carlo algorithm. The three main algorithm classes for doing so are Rejection sampling Markov-Chain Monte Carlo (MCMC) sampling Sequential Monte Carlo (SMC) ... [Read more...]

Blowing Away the Competition

April 22, 2015 | Jeffrey Horner

In February I embarked on a mission to speed up R, and I’m very pleased with the results so far. I redesigned the internal string cache, symbol table, and environments by using a somewhat obscure data structure called an Array Hash. It’s ba...
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Microsoft hiring engineers for R projects

April 22, 2015 | David Smith

Are you a talented software engineer who would like to build out the R ecosystem and help more companies access the power of R? Microsoft (Revolution Analytics' parent) is hiring a new team to do just that: Our mission is to empower enterprises to easily and cost-effectively build high-scale analytics ... [Read more...]

RcppArmadillo 0.5.000.0

April 22, 2015 | Thinking inside the box

A new major version 5.000 of Armadillo was released by Conrad a couple of days ago. Armadillo is a powerful and expressive C++ template library for linear algebra aiming towards a good balance between speed and ease of use with a syntax deliberately close to a Matlab. This version brings several ... [Read more...]

Hash Table Performance in R: Part IV

April 21, 2015 | Jeffrey Horner

In the last post I introduced the package envestigate that provides the hash table structure and interesting statistics associated with an R environment. Now I want to show you some performance characteristics of the R environment as a hash table. I&r...
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R for more powerful clustering

April 21, 2015 | Joseph Rickert

by Vidisha Vachharajani Freelance Statistical Consultant R showcases several useful clustering tools, but the one that seems particularly powerful is the marriage of hierarchical clustering with a visual display of its results in a heatmap. The term “heatmap” is often confusing, making most wonder – which is it? A "colorful visual ... [Read more...]

Introducing ghrr: GitHub Hosted R Repository

April 21, 2015 | Thinking inside the box

Background R relies on package repositories for initial installation of a package via install.packages(). A crucial second step is update.packages(): For all currently installed packages, a list of available updates is constructed or offered for either one-by-one or bulk updates. This keeps the local packages in sync with ... [Read more...]

Parse and process XML (and HTML) with xml2

April 21, 2015 | hadleywickham

I’m pleased to announced that the first version of xml2 is now available on CRAN. Xml2 is a wrapper around the comprehensive libxml2 C library that makes it easier to work with XML and HTML in R: Read XML and HTML with read_xml() and read_html(). Navigate the ... [Read more...]

Slides from recent talks

April 21, 2015 | Max Kuhn

I've been buried in work lately but thought I'd share the slides from two recent talks. The first is from the Bay Area RUG. Since someone filmed the talks, I was waiting to post the slides. The video of my t... [Read more...]

YaRrr! The Pirate’s Guide to R

April 21, 2015 | ndphillips

  If you’ve spent more than 30 minutes with me, you probably know that I’m a bit of an R fanatic. When I meet someone doing analytical work who uses software like Excel or SPSS, I inevitably go into my “R Salesman” mode. Unfortunately, after I spend 10-30 minutes trying ... [Read more...]

Plotting Factor Analysis Results

April 20, 2015 | Dan Mirman

A recent factor analysis project (as discussed previously here, here, and here) gave me an opportunity to experiment with some different ways of visualizing highly multidimensional data sets. Factor analysis results are often presented in tables of factor loadings, which are good when you want the numerical details, but bad ... [Read more...]

AusDM 2015 submission deadline extended to Thursday 30 April

April 20, 2015 | Yanchang Zhao

The 13th Australasian Data Mining Conference (AusDM 2015) Sydney, Australia, 8–9 August 2015 (co-located with SIGKDD’15) URL: http://ausdm15.ausdm.org/ The Australasian Data Mining Conference has established itself as the premier Australasian meeting for both practitioners and researchers in data mining. It … Continue reading → [Read more...]
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