Revolutions: Charting time series as calendar heat maps in R
►http://blog.revolutionanalytics.com/2009/11/charting-time-series-as-calendar-heat-maps-in-r.html
The source code for the calendarHeat function is attached in the link below, licensed as open-source under GPL v2. Share and enjoy. And if someone downloads the airline data and reproduces this chart, let us know!
#R