Data dump: My homemade stats for 2008
December 20, 2008 2 Comments
With the release of the 2008 Retrosheet play-by-play file (yay Retrosheet!), I’m able to present my home-cooked stats for 2008. As always, everything sorted by Retrosheet ID.
OPA!
Quick description: It’s my Retrosheet-based fielding evaluation system (out probability added above average). There are no catcher stats because the catcher isn’t often involved with batted ball plays.
Plate Discipline
Quick description: My plate discipline stats are based on signal detection theory and go beyond the simple walk/strikeout framework. A high sensitivity is good, but the best number for “critereon” is 1.00, no higher, no lower. Sensitivity is a measure of how good a player is at avoiding strikes against him. Critereon (or response bias) is a measure of how likely he is to swing.
Speed Scores
Quick description: I decided to go about looking at Bill James’s old speed score formula to see if I could do one better. This is what resulted. My numbers were slightly better than James’s in terms of reliability over time, but they are not fun to calculate.
Power Scores
Quick description: Same basic idea as the speed score. But with power.
All of these stats are free to use and/or re-publish provided that they are provided free to everyone and I get a mention. Enjoy.
Yay for stats.
Just got my THT annual today also.
Yay for Pizza Cutter. Thanks for your work.