Code for a simple shiny app that takes ACS 2013 (1%) data (accessed via IPUMS) and calculates the prevalence of US residents who meet selected criteria.
A working version is here: http://mkiang.shinyapps.io/PrEligibles
Note that the code is very rough shape. This was made relatively quickly as a (half) joke to one of my single friends. The code for the plot is entirely James Keirstead's and you can read about it here: http://www.jameskeirstead.ca/blog/waterfall-plots-in-r/
Steven Ruggles, J. Trent Alexander, Katie Genadek, Ronald Goeken, Matthew B. Schroeder, and Matthew Sobek. Integrated Public Use Microdata Series: Version 5.0 [Machine-readable database]. Minneapolis: University of Minnesota, 2010.