Now that college basketball is over, another winter sport, college ice hockey, is having its Frozen Four this weekend. Denver, Harvard, Minnesota-Duluth and Notre Dame are in the finals.

The per-capita production of hockey players by high school state/country is a good example of a regional sport. Obviously, the availability of ice is important for the sport dominated by north central and northeastern states. There are 60 Division I hockey programs resulting in 1,591 players. Sixty-eight percent are from the US, 29 percent from Canada and three percent from Europe.