from Amazon
Tuesday, October 30, 2007
All the fielding systems
Here’s jinaz reporting on correlations of all the fielding systems known to man, including the system that you guys contribute toward:
The Fans’ Scouting Report. This was the big surprise for me. While the hit location statistics were better correlated to one another than they were to the Fans, FSR data does pretty darn well for itself. Remember, these are data that a) are based on the subjective rankings of fans, many of whom are no better trained than I am to evaluate defense visually, and b) are weighted and converted into +/- runs by regression equations that I built upon a dataset that has rampant collinearity problems. So for it to even come close to the hit-location statistics, not to mention being a better match than the DT’s, was pretty exciting.
And here’s part 1.
The other interesting comment concerns the reliability and uses of BIS vs. STATS hit-location/"batted ball type” data. Jinaz suggests that there are obvious differences between the BIS and STATS data which contribute significantly to the different results in the rating systems, and that the best approach is a combined one. Rally has done yeoman’s work in this regard (http://home.comcast.net/~briankaat/statsite.html).