Neat, thanks for sharing! You might be interested in checking out some of Philip Maymin's work in the area as well, he's a influential Mathematica user who has done a lot of research in the same area:
http://philipmaymin.com/basketball-articles
As a question, where did you get your data? Did you scrape it, pay for it, or is there a source that provides basic basketball statistics in an easily consumable manner that you're aware of?
