Data

I've found the data used here in various places online. Sources are listed here:

• strikeouts.csv downloaded 26 Sept 2016 from http://amendelson.github.io/line-chart/strikeouts.csv
• measles_incidence.csv downloaded 26 Sept 2016 from https://github.com/blmoore/blogR/blob/master/data/measles_incidence.csv
• memory_price.csv downloaded 25 Sept 2015 from http://www.mkomo.com/cost-per-gigabyte-update/
• births.csv downloaded 27 Sept 2016 from https://github.com/jakevdp/data-CDCbirths and then cleaned (day, month, year combined into date)
• airports.csv downloaded 14 Oct 2016 from http://ourairports.com/data/ and then cleaned (columns extracted)