Someone asked us for the birthday data, and Aki replied: We used 1969-1989 also in BDA3 https://users.aalto.fi/~ave/BDA3.pdf And there we mention that the birthday data come from the National Vital Statistics System natality data and are at http://www.mechanicalkern.com/static/birthdates-1968-1988.csv, provided by Robert Kern using Google BigQuery. The code for the BDA3 example is at https://research.cs.aalto.fi/pml/software/gpstuff/demo_births.shtml (with …