Looking at the number of trips per day on a calendar heatmap reveals something odd - the first week of August has very few rides compared to any other week. While it's known people in NY tend to leave the city in August, this drop is odd.
#+caption: Calendar heatmap of trips
-[[file:assets/NYCtaxitripsNbrPlot.png]]
+[[file:../assets/NYCtaxitripsNbrPlot.png]]
Deciding to ignore August altogether, and zooming in on occupancy rate of the taxis rather than the absolute number or rides, reveals an interesting insight - people travel together far more in weekends and on public holidays!
#+caption: Occupancy heatmap
-[[file:assets/NYCtaxioccupancyPlot.png]]
+[[file:../assets/NYCtaxioccupancyPlot.png]]
Just looking at the calendar heatmap it's possible to determine 1 Jan 2013 was a Tuesday and point out Memorial Day as the last Monday of May, Labour day in September, Thanksgiving day and even Black Friday at the end of November, and of course the silly season at the end of the year!)