Scaling legislative roll call votes with wnominate

December 3, 2012

(This article was first published on is.R(), and kindly contributed to R-bloggers)

We’ve used NOMINATE scaling data before here at is.R(), but today’s Gist shows, in just a few lines of code, how to download up-to-date roll call data and run those votes through Keith Poole (et. al.)’s DW-NOMINATE procedure.

It’s really very straightforward — the tricky parts are getting the roll call object in the proper format (if it’s not already) and specifying the polarity option to indicate a conservative in every dimension. Perhaps unsurprisingly, the parties are quite distinct in the most recent Senate data:

To leave a comment for the author, please follow the link and comment on their blog: is.R(). offers daily e-mail updates about R news and tutorials on topics such as: Data science, Big Data, R jobs, visualization (ggplot2, Boxplots, maps, animation), programming (RStudio, Sweave, LaTeX, SQL, Eclipse, git, hadoop, Web Scraping) statistics (regression, PCA, time series, trading) and more...

If you got this far, why not subscribe for updates from the site? Choose your flavor: e-mail, twitter, RSS, or facebook...

Comments are closed.

Search R-bloggers


Never miss an update!
Subscribe to R-bloggers to receive
e-mails with the latest R posts.
(You will not see this message again.)

Click here to close (This popup will not appear again)