Do NHL referees call "make up" penalties? Part IV
A couple of links to other similar studies on penalty-calling:
1. Commenter Jack linked to this article with some basketball foul-calling data. Turns out the more consecutive fouls against one team, the more likely the next will go to the other team.
2. Another reader pointed me to a 2009 hockey study (web version here, PDF here) by Jack Brimberg and William J. Hurley. They looked at the first three penalties of every game, and found results similar to what I found.