Taxi data. The market share analysis of rides in New York City was based in part on the data from the New York City Taxi and Limousine Commission. Data on each ride can be found on the website www.nyc.gov/html/tlc/

html/about/trip_record_data.shtml. Because there are over 10,000,000 rides a month, the monthly files are large—up to 2 GB each. For each ride they contain information on the location, costs, and date, among other variables. Here are 13 columns and the first 11rows (of 11,934,338!) for Yellow Taxis in the month of April 2016. (For a fascinating analysis of taxi data in New York and Chicago, visit the website toddwschneider.com/)