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PrOPS Again

by JC Bradbury
May 16, 2005

I want to thank the many readers who sent me their comments on PrOPS. In response to these suggestions, I made two changes when I recalculated the metric.

- I controlled for the speed of the players using speed scores.
- I broke the metric out into three predictive components (PrAVE, PrOBP, and PrSLG).

To proxy player speed, I took the average of the five speed scores referenced in Speed Scores and Reaching Base on Errors by Dan Levitt. I decided on using the mean after trying several other combinations of the individual speed scores. The improvement was real yet modest, improving a fit of the regression model just slightly. Breaking PrOPS out into it's components is useful for identifying where players are under-performing.

The updated stats, through May 14, are now posted for the American League and National League.

JC Bradbury runs the weblog Sabernomics: Economic Thinking about Baseball. You can contact him with your comments and questions via e-mail.



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