Click image to enlarge.
This pretty map displays the Die Hard Index, one take on rating just how ardent the fans of baseball teams are. By design graduate student Russ Maschmeyer, who explains,
The Die Hard Index determines the quality of a sport team’s fans, or more specifically, the degree to which fans will continue to buy tickets, even when the economy is poor, ticket prices are sky high, and they have a losing team.
The formula used to arrive at the map’s conclusions is at the top right of the large image.
[...] out the Baseball Die-Hard Index, via Trolley Dodger. Although I agree with most of it, I do believe the Dodger Die-Hard numbers are a little light. [...]