Articles by Ari Lamstein

Free R Help: October Edition

October 5, 2015 | Ari Lamstein

Last Month I offered 10 slots of Free R Help and the response was overwhelming. About 100 people requested slots, which was much more than I expected. Many of the people who I helped had taken online R courses such as the Coursera Data Science Specialization, but were struggling with applying what ... [Read more...]

Combining Choropleth Maps and Reference Maps in R

September 30, 2015 | Ari Lamstein

Recent updates to my mapping packages now make it easy to combine choropleth maps and reference maps in R. All you have to do is pass the parameter reference_map = TRUE to the existing functions. This should “just work”, regardless of which region you zoom in on or what data ...
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Free R Help

September 3, 2015 | Ari Lamstein

Today I am giving away 10 sessions of free, online, one-on-one R help. My hope is to get a better understanding of how my readers use R, and the issues they face when working on their own projects. The sessions will be over the next two weeks, online and 30-60 minutes ...
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New release: Choroplethr v3.2.0

August 27, 2015 | Ari Lamstein

Today I am happy to announce that a new version of choroplethr, v3.2.0, is now available. You can get it by typing the following from an R console: install.packages("choroplethr") Note that it sometimes takes a few days for new packages to get copied to each CRAN mirror. If ...
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Mapping Historic US Presidential Election Results

August 13, 2015 | Ari Lamstein

Today I will demonstrate how to map historic US Presidential Election results in R. If you want to skip ahead and play with a shiny app that lets you visualize this dataset, then click here. The dataset we will use comes from wikipedia’s List of United States presidential election ...
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Tutorial Recap: Make a Census Explorer with Shiny

August 6, 2015 | Ari Lamstein

On July 28 I had the pleasure of leading a tutorial titled Make a Census Explorer with Shiny! at the San Francisco R-ladies Meetup. A big thank you to Gabriela de Queiroz for organizing the event, Sharethrough for hosting it, and all the participants for attending. If you are interested in ...
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Administrative Maps and Projections in R

July 23, 2015 | Ari Lamstein

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 things, translating a high level wish into software can be complicated. If you want to skip ahead and play with ...
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New Tutorial: Make a Census Explorer!

July 9, 2015 | Ari Lamstein

Today I am happy to announce a new tutorial I am running titled Make a Census Explorer with Shiny! It is free and will be held July 28 in San Francisco. In the tutorial we will combine R’s Shiny framework for web development with the census-mapping choroplethr package to create ...
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Exploring the Demographics of Ferguson, Missouri

July 2, 2015 | Ari Lamstein

One interesting feature of Census data is that it can help us to better understand current events and claims by the media. For example, the news coverage of the shooting of Michael Brown in Ferguson, Missouri often reported that Ferguson is predominately black, while the police officers are predominately white. ...
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New Package: choroplethrCaCensusTract

June 11, 2015 | Ari Lamstein

Today I am happy to announce that my newest R package, choroplethrCaCensusTract, is now available on github. The package’s title is a combination of three words: choroplethr: the package has similar functions and data objects as my package choroplethr. The name choroplethr itself is a combination of the words ...
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Welcome to!

June 4, 2015 | Ari Lamstein

Today I am happy to announce that I have migrated my blog from to I thought I would give an inside peek into the change in case others have an interest. Also, I would personally like to see more R packages and blogs, and I ...
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Tutorial Recap: Analyzing Census Data in R

May 22, 2015 | Ari Lamstein

A big thanks to Gabriela de Quieroz for organizing the San Francisco R-ladies Meetup, where I spent a few hours yesterday introducing people to my census-related R packages. A special thanks to Sharethrough as well, for letting us use their space for the event. It was my first time running ... [Read more...]

Upcoming Tutorial: Analyzing US Census Data in R

May 11, 2015 | Ari Lamstein

Today I am pleased to announce that on May 21 I will run a tutorial titled Analyzing US Census Data in R. While I have spoken at conferences before, this is my first time running a tutorial. My hope is that everyone who participates will learn something interesting about the demographics ... [Read more...]
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