## Egyptian fractions [Le Monde puzzle #922]

July 27, 2015
By

For its summer edition, Le Monde mathematical puzzle switched to a lighter version with immediate solution. This #922 considers Egyptian fractions which only have distinct denominators (meaning the numerator is always 1) and can be summed. This means 3/4 is represented as ½+¼. Each denominator only appears once. As I discovered when looking on line,

## Hadley Wickham on why he created all those R packages

July 27, 2015
By

Priceonomics published on Friday an in-depth profile of Hadley Wickham, author of many of the most popular R packages including ggplot2, dplyr and devtools. In the article, he reveals...

## Announcing: Mastering RStudio

July 27, 2015
By

Learn the holistic use of RStudio to communicate your R code effectively and persuasively. Max (@nierhoff) and I are both absolute R enthusiasts. We both strongly believe in the power...

July 26, 2015
By

Hadley is a popular figure, and rightly so as he successfully introduced many newcomers to the wonders offered by R. His approach strikes some of us...

## Tiny Data, Approximate Bayesian Computation and the Socks of Karl Broman: The Movie

July 26, 2015
By

This is a screencast of my UseR! 2015 presentation: Tiny Data, Approximate Bayesian Computation and the Socks of Karl Broman. Based on the original blog post it...

## Making Static/Interactive Voronoi Map Layers In ggplot/leaflet

July 26, 2015
By

Despite having shown various ways to overcome D3 cartographic envy, there are always more examples that can cause the green monster to rear it’s ugly head. Take the Voronoi...

## RcppZiggurat 0.1.3: Faster Random Normal Draws

July 26, 2015
By

After a slight hiatus since the last release in early 2014, we are delighted to announce a new release of RcppZiggurat which is now on the CRAN network...

## Installing and Starting SparkR Locally on Windows OS and RStudio

July 26, 2015
By

Introduction With the recent release of Apache Spark 1.4.1 on July 15th, 2015, I wanted to write a step-by-step guide to help new users get up and running with...

## Where do letters occur in words

July 26, 2015
By

A while back I encountered an interesting graphic showing where letters were located in english words (http://www.prooffreader.com/2014/05/graphing-distribution-of-english.html). The other day I decided to do a similar one for letters...

## Predicting Titanic deaths on Kaggle II: gbm

July 26, 2015
By

Following my previous post I have decided to try and use a different method: generalized boosted regression models (gbm). I have read the background in Elements of Statistical Learning and arthur...

## Rcpp 0.12.0: Now with more Big Data!

July 25, 2015
By

A new release 0.12.0 of Rcpp arrived on the CRAN network for GNU R this morning, and I also pushed a

July 25, 2015
By

As I was putting together the coord_proj ggplot2 extension I had posted a (https://gist.github.com/hrbrmstr/363e33f74e2972c93ca7) that I shared on Twitter. Said gist received a comment (several, in fact) and a...

## IEEE Spectrum Puts R in 6th Place

July 25, 2015
By

R has moved up three positions to 6th place on IEEE Spectrum ranking. How long will it be before Julia is on the list? The post IEEE Spectrum Puts R...

## Logistic Growth, S Curves, Bifurcations, and Lyapunov Exponents in R

July 24, 2015
By

If you’ve ever wondered how logistic population growth (the Verhulst model), S curves, the logistic map, bifurcation diagrams, sensitive dependence on initial conditions, “orbits”, deterministic chaos, and Lyapunov exponents...

## New quantmod and TTR on CRAN

July 24, 2015
By

I just sent quantmod_0.4-5 to CRAN, and TTR_0.23-0 has been there for a couple weeks. I'd like to thank Ivan Popivanov for many useful reports and patches to TTR....

## A Path Towards Easier Map Projection Machinations with ggplot2

July 24, 2015
By

The \$DAYJOB doesn’t afford much opportunity to work with cartographic datasets, but I really like maps and tinker with shapefiles and geo-data when I can, plus answer a ton...

## {Long Vs. Wide} Data Frames

July 24, 2015
By

Introduction This is an excellent resource to understand 2 types of data frame format: Long and Wide. Just take a look at figure 1 inside the article 1) Long format: ggplot2 needs...

## R #6 in IEEE 2015 Top Programming Languages, Rising 3 Places

July 24, 2015
By

IEEE Spectrum has published its 2015 list of Top Programming Languages, and R ranks in 6th place, jumping 3 places from its 2014 ranking. Here's what the IEEE has...

## Why I use Panel/Multilevel Methods

July 24, 2015
By
$Why I use Panel/Multilevel Methods$

I don’t understand why any researcher would choose not to use panel/multilevel methods on panel/hierarchical data. Let’s take the following linear regression as an example: , where is a...

## mapView: basic interactive viewing of spatial data in R

July 24, 2015
By

Working with spatial data in R I find myself quite often in the need to quickly visually check whether a certain analysis has produced reasonable results. There are two...

## CACM Highlights R

July 23, 2015
By

The Association for Computing Machinery is the main professional organization for computer science, largely for academia but still with a broad membership. ACM publishes a number of journals, most...

## A 15-Week Intro Statistics Course Featuring R

July 23, 2015
By

Do you teach introductory statistics or data science? Need some help planning your fall class? I apply the 10 Principles of Burning Man in the design and conduct of...

## An alternative presentation of the ProPublica Surgeon Scorecard

July 23, 2015
By

ProPublica, an independent investigative journalism organisation, have published surgeon-level complications rates based on Medicare data. I have already highlighted problems with the reporting of the data: surgeons are described...

## Revolution R Open 3.2.1 now available

July 23, 2015
By

The latest update to Revolution R Open, RRO 3.2.1, is now available for download from MRAN. This release upgrades to the latest R engine (3.2.1), enables package downloads via...

## Sunbelt XXXV, Social Network Analysis, Statnet and R

July 23, 2015
By

by Joseph Rickert The XXXV Sunbelt Conference of the International Network for Social Network Analysis (INSNA) was held last month at Brighton beach in the UK. (And I am...

## Administrative Maps and Projections in R

July 23, 2015
By

Today I will demonstrate how to create maps of “other countries”, and use map projections, with the choroplethr package in R. I write “other countries” in quotes because, like most...

## Waterfall plots – what and how?

July 23, 2015
By

“Waterfall plots” are nowadays often used in oncology clinical trials for a graphical representation of the quantitative response of each subject to treatment. For an informative article explaining waterfall...

## Call for participation: AusDM 2015, Sydney, 8-9 August

July 23, 2015
By

************************************************************* The 13th Australasian Data Mining Conference (AusDM 2015) Sydney, Australia, 8–9 August 2015 URL: http://ausdm15.ausdm.org/ ************************************************************* The Australasian Data Mining Conference is devoted to the art and science...