July 2013

A Note About proj4 in R

July 24, 2013 | S.S. Rebelious

It's been a long time since I had to transform some coordinates 'manually'. I mean I had a list of coordinates that I needed to [re]project. There are some nice proprietary tools for it, but who needs them when the opensource is everywhere?Proj4 is an ... [Read more...]

Selecting subset of variables in data frame

July 24, 2013 | Tomáš Greif

I frequently work with datasets with many variables. In this case I often need to apply some function to subset of variables in data frame. To simplify this task I wrote short function that allows me to specify what variables to include and what variables should be excluded.   I do ... [Read more...]

Making infographics using R and Inkscape

July 24, 2013 | Vik Paruchuri

I have been making charts with R for almost as long as I have been using R, and with good reason: R is an amazing tool for filtering and visualizing data. With R, and particularly if we use the excellent ggplot2 library, we can go from raw data to compelling ... [Read more...]

Electricity Usage in a High-rise Condo Complex pt 4

July 24, 2013 | Wayne

This is the fourth article in the series, where the techiness builds to a crescendo. If this is too statistical/programming geeky for you, the next posting will return to a more investigative and analytical flavor. Last time, we looked at … Continue reading → [Read more...]

Postscript to Data Visualization

July 23, 2013 | Cory Lesmeister

Much to my chagrin, I realized I forgot to include one of the more interesting features in the lattice package. You can quickly turn a quantitative variable into one of levels of equal counts.  This provides a nice way of looking at slices of your... [Read more...]

Using survival models for marketing attribution

July 23, 2013 | Andrie de Vries

by Andrie de Vries Prior to joining Revolution Analytics in March this year, I spent several years in the field of market research and survey analytics. During this period, I spent a few months consulting to a digital marketing agency based in London. My role was to help build their ... [Read more...]

A Beginner’s Look at Julia

July 23, 2013 | Randy Zwitch

Over the past month or so, I’ve been playing with a new scientific programming language called ‘Julia‘, which aims to be a high-level language with performance approaching that of C. With that goal in mind, Julia could be a replacement for the ‘multi-language’ problem of needing to move between ... [Read more...]

The R User Conference 2013: Albacete, Spain

July 23, 2013 | Kevin Davenport

I was fortunate enough to attend the 2013 UseR! conference in Albacete, Spain this year. I had a great time meeting fellow R users and exchanging ideas on R implementations. The conference is also one of the few opportunities to gain exposure to uses of R in other disciplines because there ... [Read more...]

How to run R in the cloud (for teaching)

July 23, 2013 | datamindjo

Last week, we launched the early stage beta version of our interactive online learning platform for R: DataMind.org. The development of this educational platform required the creation of a new IT infrastructure able to run R in the cloud. In this post, we share our approach and insights on ... [Read more...]

Generating Sankey Diagrams from rCharts

July 23, 2013 | Tony Hirst

A couple of weeks or so ago, I picked up an inlink from an OCLC blog post about Visualizing Network Flows: Library Inter-lending. The post made use of Sankey diagrams to represent borrowing flows, and by implication suggested that the creation of such diagrams is not as easy as it ... [Read more...]

Review: Kölner R Meeting 19 July 2013

July 23, 2013 | Markus Gesmann

Despite the hot weather and the beginning of the school holiday season in North Rhine Westphalia the Cologne R user group met yet again for two fascinating talks and beer and schnitzel afterwards.Analysing Twitter data to evaluate the US Dollar / Euro exchange rates Dietmar Janetzko presented ideas to forecast ... [Read more...]

Visual debugging with RStudio

July 22, 2013 | Andrea Spanò

Introduction From release 098.208 the last RStudio IDE comes with a visual debugger. Now debugging with R and RStudio becomes a simple and efficient task. This short post does not want to be a crash course: “debugging with R” nor … Continue reading → [Read more...]

Bike sharing in 100 cities

July 22, 2013 | David Smith

Many cities around the world have bike sharing programs: pick up a bike at a docking station, ride it across town and drop it off at another session, and just pay for the time you use. (Even Albacete, the Spanish college down hosting last month's UseR conference, had one.) Most ... [Read more...]

More goodies from rCharts

July 22, 2013 | pssguy

The guys developing rCharts continue to release enhancements by the day and I have taken advantage to update a couple of Shiny apps The CRAN download app now sports the new exporter feature so that any chart a user comes up with can be saved as a SVG vector, PNG ... [Read more...]
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