Articles by Harlan

integrating R with other systems

June 16, 2012 | 0 Comments

I just returned from the useR! 2012 conference for developers and users of R. One of the common themes to many of the presentations was integration of R-based statistical systems with other systems, be they other programming languages, web systems, or enterprise data systems. Some highlights for me were an update ... [Read more...]

hacking .gov shortened links

July 30, 2011 | 0 Comments

This past Friday, the web portal to the US Federal government, USA.gov, organized hackathons across the US for programmers and data scientists to work with and analyze the data from their link-shortening service. It turns out that if you shorten a web link with bit.ly, the shortened link ... [Read more...]

making meat shares more efficient with R and Symphony

May 9, 2011 | 0 Comments

In my previous post, I motivated a web application that would allow small-scale sustainable meat producers to sell directly to consumers using a meat share approach, using constrained optimization techniques to maximize utility for everyone involved. In this post, I’ll walk through some R code that I wrote to ... [Read more...]

how to speak ggplot2 like a native, and Predictive Analytics World

October 24, 2010 | 0 Comments

I was recently given the opportunity to re-present my ggplot2 talk, which I originally gave to the NYC R Meetup, to the DC R Meetup group. The Meetup was held co-located with the Predictive Analytics World conference in Alexandria, VA. (More on my thoughts on PAW below…) Contentwise, I made ... [Read more...]

Prediction with Multilevel Regression Models, and Pizza

October 15, 2010 | 0 Comments

The Meetup phenomenon, which is now substantial and longstanding enough to be more of a cultural change than a flash in the pan, continues to impress me. Even more so than tools like LinkedIn, Meetups have changed the nature of professional networking, making it more informal, diverse, and decentralized. Last ... [Read more...]

ggplot and concepts — what’s right, and what’s wrong

March 7, 2010 | 0 Comments

A few months back I gave a presentation to the NYC R Meetup. (R is a statistical programming language. If this means nothing to you, feel free to stop reading now.) The presentation was on ggplot2, a popular package for generating graphs of data and statistics. In the talk (which ... [Read more...]

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