THE BOOK--Playing The Percentages In Baseball

Thursday, March 20, 2008

Baseball Reference boarding the Leverage and WPA train

Sean has asked for, and received, my Win Expectancy (WE) and Leverage Index (LI) data for Run environments of 3.0 to 6.5. Fangraphs has the exact same data at the exact same terms: free, as long as all their users don’t have to pay to see the data (via PI).  This offer is open to any information provider under the same terms.

You can see the results in the above link (still in Beta, so glossary not updated).  One interesting presentation he did was to show the win expectancy play-by-play from the perspective of the eventual winning team.  That’s what that “wWE” means (win expectancy of winning team).

Just as cool is the pitching summary, where he shows the result of strikes: contacted, swing&miss, called no swing.  In addition, you get to see the results of the contacted PA by GB, FB, LD. 

The payoff will be when we see this on the players’ split pages, so we can see seasonal and career totals.