### Simply StatisticsA statistics blog by Rafa Irizarry, Roger Peng, and Jeff Leek

I wrote a little function to make a personalized map of who follows you or who you follow on Twitter. The idea for this function was inspired by some plots I discussed in a previous post. I also found a lot of really useful code over at flowing data here

The function uses the packages twitteR, maps, geosphere, and RColorBrewer. If you don’t have the packages installed, when you source the twitterMap code, it will try to install them for you. The code also requires you to have a working internet connection.

One word of warning is that if you have a large number of followers or people you follow, you may be rate limited by Twitter and unable to make the plot.

The function has the following form:

with arguments:

• userLocation - an optional argument giving the location of the user, necessary when the location information you have provided Twitter isn’t sufficient for us to find latitude/longitude data
• fileName - the file where you want the plot to appear
• nMax - The maximum number of followers/following to get from Twitter, this is implemented to avoid rate limiting for people with large numbers of followers.
• plotType - if “both” both followers/following are plotted, etc.

Then you can create a plot with both followers/following like so:

Here is what the resulting plot looks like for our Twitter Account:

If your location can’t be found or latitude longitude can’t be calculated, you may have to chose a bigger city near you. The list of cities used by twitterMap can be found like so:

library(maps)

data(world.cities)

grep(“Baltimore”, world.cities[,1])

If your city is in the database, this will return the row number of the world.cities data frame corresponding to your city.

If you like this function you may also like our function to determine if you are a data scientist or to analyze your Google Scholar citations page.
Update: The bulk of the heavy lifting done by these functions is performed by Jeff Gentry’s very nice twitteR package and code put together by Nathan Yau over at FlowingData. This is really an example of standing on the shoulders of giants.