White Sox news, Minor Leagues updates and more

August 13, 2009

Fangraphs haz tRA

Filed under: Chicago White Sox — The Wizard @ August 13, 2009 11:51 pm
Tags: , , , , , ,


Good news everyone. tRA has made its way to FanGraphs thanks to Graham MacAree of Lookout Landing and statcorner.com. tRA is currently located in the player pages under the batted ball section of stats. Directly from the StatCorner glossary: tRA involves assigning run and out values to all events under a pitcher’s control and coming up with an expected number of runs allowed and outs generated in a defense and park neutral environment. tRA is on a R/9 scale and does not involve any regression of the rates.

some tRAs for 2009:  Mark Buehrle (5.15), John Danks (4.50), Jake Peavy (3.17), Gavin Floyd (5.01), Jose Contreras (4.24), Bartolo Colon (6.01), Clayton Richard (5.01)

Fangraphs’ tRA is different than statcorner’ tRA though:

There are a couple things which are different between the StatCorner version of tRA and the version implemented on FanGraphs. The main difference is we’re using Baseball Info Solutions batted ball stats instead of Gameday batted ball stats. The other difference, though probably not as major is we’re using different park factors.

the statcorner values: Buehrle, Mark (4.50), Danks, John (4.00), Peavy, Jake (3.17), Floyd, Gavin (4.26), Contreras, Jose (3.65), Colon, Bartolo (4.70), Richard, Clayton (5.01)

BTW, here’s a more detailed introduction to tRA. And here.


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